PyTorch 1.9 Release Notes

• Highlights
• Backwards Incompatible Change
• Deprecations
• New Features
• Improvements
• Bug Fixes
• Performance
• Documentation

Highlights

We are excited to announce the release of PyTorch 1.9. The release is composed of more than 3,400 commits since 1.8, made by 398 contributors. Highlights include:

• Major improvements to support scientific computing, including torch.linalg, torch.special, and Complex Autograd
• Major improvements in on-device binary size with Mobile Interpreter
• Native support for elastic-fault tolerance training through the upstreaming of TorchElastic into PyTorch Core
• Major updates to the PyTorch RPC framework to support large scale distributed training with GPU support
• New APIs to optimize performance and packaging for model inference deployment
• Support for Distributed training, GPU utilization and SM efficiency in the PyTorch Profiler

We’d like to thank the community for their support and work on this latest release. We’d especially like to thank Quansight and Microsoft for their contributions.

You can find more details on all the highlighted features in the PyTorch 1.9 Release blogpost.

Backwards Incompatible changes

Python API

• torch.divide with rounding_mode='floor' now returns infinity when a non-zero number is divided by zero (#56893). This fixes the rounding_mode='floor' behavior to return the same non-finite values as other rounding modes when there is a division by zero. Previously it would always result in a NaN value, but a non-zero number divided by zero should return +/- infinity in IEEE floating point arithmetic. Note this does not effect torch.floor_divide or the floor division operator, which currently use rounding_mode='trunc' (and are also deprecated for that reason).

>>> a = torch.tensor([-1.0, 0.0, 1.0])
>>> b = torch.tensor([0.0])
>>> torch.divide(a, b, rounding_mode='floor')
tensor([nan, nan, nan])
      

>>> a = torch.tensor([-1.0, 0.0, 1.0])
>>> b = torch.tensor([0.0])
>>> torch.divide(a, b, rounding_mode='floor')
tensor([-inf, nan, inf])
      

• Legacy tensor constructors and Tensor.new no longer support passing both Tensor and device as inputs (#58108). This fixes a bug in which 1-element integer tensors were misinterpreted as specifying tensor size, yielding an uninitialized tensor. As noted in the error message, use the new-style torch.tensor(...) or torch.as_tensor(...) to copy or alias an existing tensor. If you want to create an uninitialized tensor, use torch.empty(...).

>>> a = torch.tensor([1])
>>> torch.LongTensor(a, device='cpu') # uninitialized
tensor([7022349217739848992])
>>> a.new(a, device='cpu')
tensor([4294967295]) # uninitialized
      

>>> a = torch.tensor([1])
>>> torch.LongTensor(a, device='cpu')
RuntimeError: Legacy tensor constructor of the form torch.Tensor(tensor, device=device) is
not supported. Use torch.tensor(...) or torch.as_tensor(...) instead.
>>> a.new(a, device='cpu')
RuntimeError: Legacy tensor new of the form tensor.new(tensor, device=device) is not
supported. Use torch.as_tensor(...) instead.
      

• torch.divide with rounding_mode='true' is replaced with rounding_mode=None (#51988). torch.divide's undocumented rounding_mode='true' option has been removed, and instead rounding_mode=None should be passed to indicate no rounding should take place. This is equivalent to omitting the argument entirely.

>>> a, b = torch.full((2,), 4.2), torch.full((2,), 2)
>>> torch.divide(a, b, rounding_mode='true')
tensor([2.1000, 2.1000])
      

>>> a, b = torch.full((2,), 4.2), torch.full((2,), 2)
>>> torch.divide(a, b, rounding_mode=None) # equivalent to  torch.divide(a, b, rounding_mode='true') from the prior release
tensor([2.1000, 2.1000])
      

• import torch.tensor as tensor is no longer supported (#53424). Instead, use from torch import tensor

>>> import torch.tensor as tensor
>>> torch.tensor(1.)
tensor(1.)
      

>>> import torch.tensor as tensor
ModuleNotFoundError: No module named 'torch.tensor'
>>> from torch import tensor
>>> tensor(1.)
tensor(1.)
      

• binary release: numpy is no longer a required dependency If you require numpy (and don't already have it installed) you will need to install it separately.

Autograd

• torch.autograd.gradcheck.get_numerical_jacobian and torch.autograd.gradcheck.get_analytical_jacobian no longer support functions that return complex valued output as well as any other values of grad_out not equal to 1 (#55692). This change is a part of a refactor of gradcheck’s internals. Note that gradcheck itself still supports functions with complex output. This new restriction only applies to calls to the two internal helper functions. As a workaround, you can wrap your functions to return either the real or imaginary component of its output before calling these functions. Additionally these internal helpers no longer accept any other value except 1 for grad_out for any input function. Note that these helper functions are also being deprecated in this release.

1.8.1:

get_numerical_jacobian(torch.complex, (a, b), grad_out=2.0)

1.9.0:

      def wrapped(fn):
            def wrapper(*input):
                return torch.real(fn(*input))
            return wrapper
        
        get_numerical_jacobian(wrapped(torch.complex), (a, b), grad_out=1.0)

• torch.autograd.gradcheck now throws GradcheckError (#55656). This change is a part of a refactor of gradcheck’s internals. All errors that are able to be silenced by raise_exception=False now raise GradcheckError (which inherits from RuntimeError). If you explicitly check that the type of the error is RuntimeError you'll need to update your code to check for GradcheckError instead. Otherwise if you use something like except or isinstance, no changes are necessary.

1.8.1:

# An example of a situation that will now return GradcheckError instead of
# RuntimeError is when there is a jacobian mismatch, which can happen
# for example when you forget to specify float64 for your inputs.
try:
    torch.autograd.gradcheck(torch.sin, (torch.ones(1, requires_grad=True),))
except RuntimeError as e:
    assert type(e) is RuntimeError # explicitly check type -> NEEDS UPDATE

1.9.0:

try:
    torch.autograd.gradcheck(torch.sin, (torch.ones(1, requires_grad=True),)
except RuntimeError as e:
   # GradcheckError inherits from RuntimeError so you can still catch this
   # with RuntimeError (No change necessary!)
   
   # BUT, if you explicitly check type...
   assert type(e) is torch.autograd.GradcheckError

• Finished deprecation cycle for in-place view error checks (#56093). In-place modification of views will now raise an error if that view was created by a custom function or a function that returns multiple views, or if the view was created in no-grad mode. Modifying in-place a view created in the situations above are error-prone and have been deprecated since v1.5.0. Doing these in-place modifications are now forbidden. For more information on how to work around this, see the related sections the release notes linked below:
  • v1.5.0 (view created in custom autograd function, view created in no-grad block)
  • v1.7.0 (section on split and chunk, i.e., functions that return multiple views).

torch.nn

• Fixed regression for nn.MultiheadAttention to now apply bias flag to both in and out projection layers (#52537). In PyTorch 1.6, a regression was introduced that caused the bias flag of nn.MultiheadAttention only to apply to the input projection layer. This caused the output projection layer to always include a bias parameter, even with bias=False specified. The regression is now fixed in PyTorch 1.9, making the bias flag correctly apply to both the input and output projection layers. This fix is BC-breaking for the bias=False case as it will now result in no bias parameter for the output projection layer.

>>> mha = torch.nn.MultiheadAttention(4, 2, bias=False)
>>> print(mha.out_proj.bias)
Parameter containing:
tensor([0., 0., 0., 0.], requires_grad=True)
      

>>> mha = torch.nn.MultiheadAttention(4, 2, bias=False)
>>> print(mha.out_proj.bias)
None
      

• Updated nn.Module to fire full backward hooks even when no input requires grad (#56693). Prior to this release, full backward hooks were not fired when no input requires gradients. This has been changed so that full backward hooks will always fire during the backward pass, regardless of whether or not any input requires gradients. If you are using full backward hooks, be aware that they may fire more frequently than pre-1.9 due to this change.

>>> m = torch.nn.Linear(2, 3)
>>> def hook(mod, grad_input, grad_output):
>>> print('hook called:', grad_input, grad_output)
>>> m.register_full_backward_hook(hook)
>>> input_no_grad = torch.rand(1, 2, requires_grad=False)
>>> m(input_no_grad).sum().backward()
>>> input_grad = torch.rand(1, 2, requires_grad=True)
>>> m(input_grad).sum().backward()
hook called: (tensor([[0.1478, 0.6517]]),) (tensor([[1., 1., 1.]]),)
      

>>> m = torch.nn.Linear(2, 3)
>>> def hook(mod, grad_input, grad_output):
>>> print('hook called:', grad_input, grad_output)
>>> m.register_full_backward_hook(hook)
>>> input_no_grad = torch.rand(1, 2, requires_grad=False)
>>> m(input_no_grad).sum().backward()
hook called: (None,) (tensor([[1., 1., 1.]]),)
>>> input_grad = torch.rand(1, 2, requires_grad=True)
>>> m(input_grad).sum().backward()
hook called: (tensor([[0.1478, 0.6517]]),) (tensor([[1., 1., 1.]]),)
      

Dataloader

• Add Numpy seeding to worker of DataLoader (#56488). DataLoader with num_workers > 0 will now set independent random seed for NumPy random functions on each worker by default. So, users now won’t be required to set random seed for NumPy using worker_init_fn to force NumPy random operations deterministic and independent across DataLoader workers. This PR won’t affect users who have already set random seed for NumPy random functions using worker_init_fn.

        # dataset returns numpy.random.randint(1, 10000) 
        ctx = mp.get_context('fork')
        gen = torch.Generator().manual_seed(0)
        dl = DataLoader(dataset, batch_size=2, num_workers=2, multiprocessing_context=ctx, generator=gen)
        for epoch in range(2):
            print("=" * 4, "Epoch", epoch, "=" * 4)
            for batch in dl:
                print(batch)

# When using fork, each worker has same random seed for NumPy random functions at each epoch.
========== Epoch 0 ==========
tensor([[ 0, 340],
[ 1, 7512]])
tensor([[ 2, 340],
[ 3, 7512]])
========== Epoch 1 ==========
tensor([[ 0, 340],
[ 1, 7512]])
tensor([[ 2, 340],
[ 3, 7512]])
      

# Random seeds for NumPy are different across `DataLoader` workers in each epoch.
========== Epoch 0 ==========
tensor([[ 0, 8715],
[ 1, 5555]])
tensor([[ 2, 6379],
[ 3, 1432]])
========== Epoch 1 ==========
tensor([[ 0, 1374],
[ 1, 996]])
tensor([[ 2, 143],
[ 3, 3507]])
      

• Added static type checking enforce for DataPipe (#54020).

A new attribute named type has been introduced for IterableDataset using the typing annotation at each class declaration. By adding this attribute, we are able to extend IterableDataset to have type inference and lazy initialization to incorporate the new DataLoader architecture. But, several BC-breaking restrictions are introduced due to this feature.

1.8.1:

# Users can use string to bypass the invalid type annotation without any error. 
# And, incorrect type annotations attached to `__iter__` function are ignored.

1.9.0:

# The following scenario will now raise different Exceptions
# 1) The type annotation is required to be valid now. Previous workaround
# like using string to  represent the invalid type annotation is not supported now.

# Raises Exception from the evaluation `eval("invalid_type", globals, locals)`
class DS(IterableDataset["invalid_type"]):  
     ...
# Raises TypeError if the return type of __iter__ is not an Iterator
class DS(IterableDataset[str]):
    def __iter__(self) -> str:
      ...
# Raise TypeError if the return type of __iter__ is of the form Iterator[X], 
# but the argument type X is not a subtype of the IterableDataset.type attribute.
class DS(IterableDataset[str]):
    def __iter__(self) -> Iterator[int]:
       ...

#  IterableDatset now has a metaclass, which will conflict with
#  existing user-defined metaclasses on IterableDatasets
class DS(IterableDataset[str], metaclass=MyMeta): 
    ...

Meta API

• Given Tensor a non-trivial (for now) metaclass _TensorMeta (#56147). Tensor now has a non-trivial metaclass. This shouldn't be user observable, as Tensor already inherits from a C defined class (and is thus incompatible with other typical metaclasses), but there may be unanticipated interactions with other language features in Python. This PR changes the metaclass of torch.tensor. I.e. type(type(torch.tensor([1]))) now prints <class 'torch._C._TensorMeta'> (used to be <class 'type'>)

C++ API

• Changed in-place resize functions to return const Tensor& (#55351). The C++ signature for resize_, resize_as_, resize_as_sparse_, sparse_resize_, and sparse_resize_and_clear_ has changed to return a const Tensor& instead of a Tensor&. This may break users’ TORCH_LIBRARY operators that called these functions but returned a non-const Tensor&. Ideally, users can change their operators to also consume and return const Tensor&, but simply casting the result of the changed function with const_cast<Tensor&> is also an option.

1.8.1:

const at::Tensor a = at::randn({2, 2});
const at::Tensor b = at::ones({1, 4}, at::kInt);
at::Tensor& out = at::resize_as_(a, b); # success

1.9.0:

const at::Tensor b = at::ones({1, 4}, at::kInt);
at::Tensor& out = at::resize_as_(a, b); 
# error: binding value of type 'const at::Tensor' to reference to type 'at::Tensor' drops 'const' qualifier
const at::Tensor& out = at::resize_as_(a, b); # Success

• Some ATen Reduction Ops as well as kron_out now throw an error when an undefined tensor is passed as input for out argument (#53218, #53640).
  • C++ API for the reductions ops like sum_out, nansum_out, prod_out, std_var_out have been changed to require users allocating result Tensor before calling these ops. The C++ API allocate_reduction_result has changed to resize_reduction_result to disallow allocating result Tensor in these reduction ops.
  • The following code can be compiled, but will raise a c10::Error when executed. This code compiled and executed successfully in the prior release.

at::Tensor out;  # Undefined Tensor
const at::Tensor a = at::randn({2, 2});
at::IntArrayRef dim = {1};
at::sum_out(out, a, dim);
# c10::Error: Expected a Tensor of type Variable but found an undefined Tensor for argument #4 'out'

• The C++ API utility functions expand_inplace and expand_outplace now return c10::MaybeOwned<Tensor> instead of std::tuple<Tensor> (#55065, #55245). The rationale for this change is to avoid unnecessary Tensor creation, thus improving performance. Functions in ExpandUtils return c10::MaybeOwned<Tensor> because expansion may not actually be needed, in which case we can improve efficiency by returning c10::MaybeOwned<Tensor>::borrowed(to_expand). However, this means that you need to be careful: the returned c10::MaybeOwned<Tensor> must not outlive the original Tensor object that to_expand referred to! The deleted rvalue reference overloads of these functions help with this by preventing trivial use of a temporary resulting from a function call, but it is still possible to make a mistake.

TorchScript

• Added recursive scripting for class type module attributes (#55124).
  • This change is BC-breaking because it will result in class type module attributes being scripted when a module instance is scripted. In previous versions, such attributes were ignored unless their class type was also marked with @torch.jit.script. This new feature attempts to script the type, and falls back to the old behaviour of marking the class type attribute as "failed" if scripting fails. However, if the class definition does not have type annotations, the definition of the scripted class can different from users might expect (see code sample). If needed, users can explicitly disable the scripting of a class type attribute by adding its name to the __jit_ignored_attributes__ class attribute of the module being scripted.

1.8.1:

class MyClass:
    def __init__(self, a):
        self.attr = a
        
class MyModule(torch.nn.Module):
    def __init__(self):
        self.attr = MyClass(4)
        
sm = torch.jit.script(MyModule())

1.9.0:

class MyClass:
    def __init__(self, a):
        self.attr = a
        
class MyModule(torch.nn.Module):
    def __init__(self):
        self.attr = MyClass(4)
 
# RuntimeError: Could not cast attribute 'attr' to type Tensor: Unable to cast Python instance of type <class 'int'> to C++ type 'at::Tensor'         
sm = torch.jit.script(MyModule()) 

This error occurs because MyClass is automatically scripted, but self.attr is inferred to be a Tensor instead of an int because a is not annotated. To fix this, annotate a with the right type int, or mark attr as an attribute that should be ignored by the scripting process and not recursively processed:

       class MyModule(torch.nn.Module):
            __jit_ignored_attributes__ = ["attr"]
        
            def __init__(self):
                self.attr = MyClass(4)

Quantization

• torch.quantization.quantize_fx.convert_fx’s debug argument has been changed to is_reference (#52179).

import torch.quantization.quantize_fx as quantize_fx
>>> m = quantize_fx.convert_fx(m, debug=True)
(Runs successfully)
      

>>> m = quantize_fx.convert_fx(m, is_reference=True) # Runs successfully
>>> m = quantize_fx.convert_fx(m, debug=True)
Traceback (most recent call last):
File "", line 1, in 
TypeError: convert_fx() got an unexpected keyword argument 'debug'
      

• torch.cat is now quantized to torch.cat instead of torch.ops.quantized.cat (#54924). Previously, we produced torch.ops.quantize.cat which took inputs, dequantized them and requantized them with new qparams. This behavior has been changed to produce torch.cat directly. torch.cat uses the same observer/fake_quant instance for all inputs and output, assumes all inputs are sharing the same qparam, and produces a quantized Tensor with the same qparam as all inputs. Using torch.cat is expected to be more efficient since it does not introduce extra quant/dequant.
  • Version 1.8.1: torch.cat was quantized to torch.ops.quantized.cat.
  • Version 1.9: torch.cat is quantized to torch.cat (torch.cat works on both floating point and quantized Tensor).

Distributed

• DistributedDataParallel: Removed support for inter-process device replication in DDP (#54454, #54825, #54826, #55212, #55253, #55353). DistributedDataParallel now errors out when users attempt to use it in single-process multi-device mode, where a module is replicated across more than one device in a single process. This mode had been previously deprecated and is now removed. Use cases should switch to spawning a single process for each device that is used in replication, which is the performant way to use DistributedDataParallel and supports a variety of newly developed features.

1.8.1:

>>> # Assume the below is ran on 2 ranks in a distributed setting.
>>> rank_to_devices = { 0: [0, 1], 1: [2, 3] }
>>> # Each rank replicates model across 2 GPUs.
>>> model_ddp = torch.nn.parallel.DistributedDataParallel(
        model,
        device_ids=rank_to_devices[rank]
    )
>>> # No error is raised, but below warning is produced.
>>> UserWarning: Single-Process Multi-GPU is not the recommended mode for DDP. In this mode, each DDP instance operates on multiple devices and creates multiple module replicas within one process. The overhead of scatter/gather and GIL contention in every forward pass can slow down training. Please consider using one DDP instance per device or per module replica by explicitly setting device_ids or CUDA_VISIBLE_DEVICES.

1.9.0:

>>> # Assume the below is ran on 2 ranks in a distributed setting.
>>> rank_to_devices = { 0: [0, 1], 1: [2, 3] }
>>> # Each rank replicates model across 2 GPUs.
>>> model_ddp = torch.nn.parallel.DistributedDataParallel(
        model,
        device_ids=rank_to_devices[rank]
    )
>>> # Single process multi-GPU mode now produces an error on initialization.
>>> ValueError: device_ids can only be None or contain a single element.

• torch.distributed.elastic: Replaced torch.distributed.launch with torch.distributed.elastic_launch (#56037, #56214). * --logdir → —log_dir. The stdout and stderr log dir arg name and destination changed. The file destination changed from $logdir/node_{}_local_rank_{}_stdout to $log_dir/$rank/stdout.log. If users used the —logdir introduced in 1.8 pytorch version, they need to use —log_dir parameter now.

1.8.1:

#!/bin/bash
# Assumes training script train.py exists.
python -m torch.distributed.launch --nproc_per_node=2 --nnodes=1 --node_rank=0 --master_addr="127.0.0.1" --master_port="29500" --logdir test_logdir train.py
# Logs are written to $logdir/node_{}_local_rank_{}_stdout

1.9.0:

#!/bin/bash
# Assumes training script train.py exists.
python -m torch.distributed.launch --nproc_per_node=2 --nnodes=1 --node_rank=0 --master_addr="127.0.0.1" --master_port="29500" --log_dir test_logdir train.py
# Logs are written to $log_dir/$rank/stdout.log

Deprecations

Python API

• torch.floor_divide has been deprecated in favor of torch.div(..., rounding_mode=‘floor’) (#50281).
  • torch.floor_divide incorrectly divides then truncates (rounds towards zero) instead of dividing then flooring (rounds “down”). Use the rounding_mode argument of torch.div to indicate if you’d like to continue performing truncation division or floor division, instead, since torch.floor_divide will be removed in a future PyTorch release.
• Older linear algebra operations have been deprecated in favor of their new linalg module counterparts. Namely:
  • torch.{cholesky, qr, symeig, chain_matmul, solve, eig, matrix_rank, lstsq} have been deprecated in favor of torch.linalg.{cholesky, qr, symeig, chain_matmul, solve, eig, matrix_rank, lstsq} (#57725,#57745, #57732,#53453, #57741, #57727, #57734, #57743).
  • torch.norm has been deprecated in favor of the new linalg module norm functions: torch.linalg.vector_norm, torch.linalg.matrix_norm, and torch.linalg.norm (#57986).
  • Aliased torch.det, torch.slogdet, torch.matrix_power, torch.inverse, and torch.pinverse to their linalg module counterparts (#57821).

Autograd

• [cpp] Renamed AutoNonVariableTypeMode to AutoDispatchBelowAutograd and added a warning. (#56422) AutoNonVariableTypeMode is deprecated and will be removed in 1.10 release. For kernel implementations, please use AutoDispatchBelowAutograd instead. Check out more details on how to migrate your kernel here. If you are looking for a user-facing API to enable running your inference-only workload, please use c10::InferenceMode. Using AutoDispatchBelowAutogradMode in user code is under risk of producing silently wrong result for some edge cases.

1.8.1:

{
  at::AutoNonVariableTypeMode guard(true);
}

1.9.0:

{
  c10::AutoDispatchBelowAutograd guard(true); // for kernel implementations
  // c10::InferenceMode guard(true); --> consider inference mode if you are looking for a user-facing API

}

• Removed logic for old style custom autograd Function (#57357). Instantiating a custom autograd function is now deprecated and will raise a warning. Users should call .apply() on the class itself because it is a static method.

1.8.1:

        # Instantiating custom function will raise a warning in 1.9
        Func().apply

1.9.0:

        # You should directly call the `apply` (classmethod) on the class
        Func.apply

• Deprecated get_analytical_jacobian and get_numerical_jacobian (#54378, #54049). torch.autograd.gradcheck.get_analytical_jacobian and torch.autograd.gradcheck.get_numerical_jacobian are internal-facing functions that are not a part of our public API. We’ve refactored some PyTorch internals to work without it and will remove it in a future release. For gradient checking purposes, please use torch.autograd.gradcheck.

C++ API

• Removed the redundant linalg_ prefix from torch::linalg::linalg_det and torch::linalg::linalg_norm C++ API (#57464). C++ code that used to call torch::linalg::{linalg_det, linalg_norm} should be updated to call torch::linalg::{det, norm}

Distributed

• torch.distributed.rpc: Added a warning message to retire ProcessGroup RPC backend (#55616)
  • ProcessGroup RPC backend is being deprecated and 1.9 is the last release which will carry it. The default RPC backend is TensorPipe which is the recommended backend to use over ProcessGroup.

New features

Python API

• Added BFloat16 support for torch.{ceil, floor, frac, round, trunc, lerp, roll, diag, logaddexp, logaddexp2, nan_to_num, exp2, expm1, rsqrt, erfc, atan2, hypot} on CUDA (#57910, #57907, #57916, #57908, #58063, #57913, #57905).
• Added torch.pow() for torch.{float16, BFloat16} on CPU (#55280).
• Added torch.{index_select, argmax, argmin, min, max, amin, amax} for torch.{float16, BFloat16} (#53898, #52582, #51244, #52579).
• Added torch.dot for BFloat16 on CUDA (#57903).
• Added support for tensor inputs for min and max arguments in torch.clamp (#52695, #56367).
• Added a new torch.special namespace similar to scipy.special (#52296).
  • Added special.{entr (#53500), xlog1py (#55138), i0e (#54409), erfc, erfinv (#53260)}.
  • Added aliases for special.{expm1, exp2} (#54670).
  • Added aliases for special.{sigmoid, logit} (#54759).
• Added the following new operators in PyTorch similar to those in NumPy:
  • torch.gradient (#54617)
  • torch.{hsplit, vsplit, dsplit} (#53536)
  • torch.positive (#55891)
  • torch.frexp (#51097)
  • torch.take_along_dim (#52833)
• Added a new keyword argument alpha to torch.index_add (#54176).
• Added torch.assert_async (#53086)
• Added a new keyword argument interpolation to torch.quantile (#49267).
• Add correction parameter to std/var (#50903)
• Added overloads for torch.{std, var, std_mean, var_mean} with a correction argument specifying the difference between the sample size and number of degrees of freedom.
• Add support for integer type for torch.{logit, rad2deg, deg2rad, polygamma} (#52028, #51853,#57462)
• Added support for stable sort algorithm on CPU by a new kwarg stable (#51790).
• The torch.linalg module, analogous to NumPy’s linalg module but with several additional functions, is stable! Added torch.linalg.{multi_dot, lstsq, vector_norm, matrix_norm, matrix_power, det, eig, eigvals, svdvals, cholesky_ex, inv_ex} (#51807, #49093, #51099, #57127, #52608, #53119, #52491, #56684, #56724, #58039).
• Added a new device=meta API (#53143)
  • “meta” is a new device, like CPU/CUDA, that doesn’t allocate any memory for data. Operators that are passed meta tensor inputs will perform shape inference, without running the actually kernel computation. For example, torch.ones(2, device='meta') + torch.ones(1, 2, device='meta') will return a new meta tensor of size [1, 2] (performing broadcasting), without allocating memory or running an actual kernel.
  • device=meta API is implemented for upsample_linear1d(#51917), upsample_bilinear2d and upsample_bicubic2d (#52012), upsample_nearest3d (#52065), sin(#52277), mul(#52692), pow(#53669), sub(#53679), div(#53680), copysign(#55040), atan2(#55130), sinh(#55538), acosh(#55540), cosh(#55563), cos (#55564), replication_padding1d (#55481), replication_padding3d (#55499), replication_pad1d_backward (#55537), fractional_max_pool2d (#55581), reflection_pad1d (#55531), replication_pad2d (#55511), addmv (#55746), all unary float functions (#56082), adaptive_max_pool2d(#56317), adaptive_max_pool3d (#56320), all non-float unary operators (and rsqrt) (#56151), adaptive_max_pool2d_backward (#56799), adaptive_max_pool3d_backward (#56800), neg(#57212), max_pool2d_with_indices(#56459), trunc (#57350), floor (#57587), sign (#57588), ceil (#57589), gcd (#57624), nextafter (#57625), igamma and igammac(#57626), hypot(#57627), lcm (#57628), logaddexp and logaddexp2 (#57629), maximum and minimum (#57630), topk (#57790), max_pool2d_with_indices_backward (#57797), threshold (#57810), addmm (#57417), heaviside (#57933), elu(#57619), softplus (#57620), leaky_relu (#57621), hardsigmoid (#57622), softshrink (#57623), silu (#58050), empty_strided (#53397), non-composite in-place operators (#54901)

Complex Numbers

• Added complex autograd support for torch.{masked_fill, polar, cumsum, lerp, prod, rsub, unfold, symeig, index_copy} (#52483, #52488, #53240, #53689, #48125, #53702, #52999, #55085, #52203).
• Added complex support for torch.lerp (#54129) and torch.sigmoid (#55975) on CUDA.
• Added complex support for torch.index_copy and torch.{take} and torch.Tensor.put_ on both CPU and CUDA (#52203, #53356).
• Added complex support to TorchScript.
  • Added logic to teach TorchScript frontend to parse complex literals, and complex lists. (#52881).
  • Added TorchScript support for:
    • complex constructor and torch.{add, mul, sub, as_tensor} (#52881).
    • cmath unary ops: cmath.{phase, log, log10, sqrt, exp, sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, asinh, acosh, atanh} (#54089).
    • cmath.{infj, nanj} (#54328).
    • cmath.{isinf, isnan, isfinite, rect} (#54541).
    • real and imag tensor attributes (tensor.real/imag) (#54692).
  • Fixed test_variant_consistency_jit_addmm for complex types (#54917, #57129).
• Added initial operator support for sparse complex tensors (#57125).
  • Added complex support for torch.{sparse_coo_tensor, coalesce, to_dense, to_sparse, sparse_add, sspaddmm, saddmm}.
• Added torch.Tensor.{cfloat, cdouble} functions (#58137).
• Added complex support for all reductions for torch.{std, var} to return a real valued output tensor for complex inputs (#58066) .
• Updated autograd formulas for many linear algebra operations support complex tensors:
  • eig: faster and with complex support (#52875)
  • lu: more numerically stable and with complex support. (#53994)

torch.nn

• New torch.nn modules: nn.LazyBatchNorm*d (#51862), nn.HuberLoss (#50553), nn.Mish (#58375).
• New parametrization functionality (#33344, #58142, #55456, #57784).
• nn.Conv*d: Added padding='same' mode for non-strided convolutions (#45667).
• nn.EmbeddingBag: Added padding_idx support (#49237, #56065, #56618).
• Added mish activation function (#58648).
• [memory format] Added channels last support for MaxPool2d (#56361).
• Added the option to build PyTorch with DNNL + AMD BLIS path (#54953).

Profiler

• Added skip_first parameter to the default schedule (#58025).
• Added support for trace metadata (#56575).
• Added gzip format support for chrome tracing (#56554).
• Added sequenceNr and fwdThreadId to the trace (#57182).
• Enabled Kineto in CPU builds (#53174).

Autograd

• Added new inference mode both in C++ (#54403, #53343) and python (#58045, #57480).
• Added fast_mode argument to autograd.gradcheck (#54480).
• Added support for non-Tensor inputs and outputs to torch.utils.checkpoint functions (#52422).

Dataloader

• Implemented FilterIterDataPipe (#51783).
• Added context manager for runtime type validation (#55936).
• Added typing enforcement for DataPipe at construct-time (#54066).
• Added typing Enforcement for DataPipe at runtime (#54544).
• Implemented issubtype for DataLoader type hints (#54299).
• Added type hint for SequentialSampler (#56374).
• Added ConcatDataPipe (#53301).
• Introduced deterministic context to DataLoader (#53271).
• Added ZipIterDataPipe (#53554).
• Added switch to guaranteed determinism & add option to non_deterministic (#53532).
• Added TransformsIterDataPipe (#52604).
• Renamed Callable to MapIterDataPipe (#51879).

CUDA

• Added the following new features to CUDA Graphs:
  • Private mempools (#54038)
  • Support for RNN capture when cuDNN dropout is used (#57373).
• Added support for 'max' reduction for torch.segment_reduce (#56704).
• Added support for CUDA allocator to handle multiple streams seamlessly (#55860).

C++ API

• Added torch::nn::functional::huber_loss (#50553).
• Added learning rate schedulers to C++ API (#52268).
• Added padding='same' mode to torch::conv{1,2,3}d (#45667).
• Added padding_idx argument to EmbeddingBag (#49237).
• Added mish activation function (#58648) (#58940).

TorchScript

• Added reductions to NNC python bindings (#52492).
• Added Python bindings for ExternalCalls. (#52905).
• Added an API to reorder multiple loops (#55568).
• Added NNC support for pow on CPU (#56308).
• Enabled horizontal fusion of all loops (#56324).
• Added an API for Buffer Compression (#55853).
• Added API to distribute loops (#53865).
• Added matmul for NNC lowering/unified dtypes (#56456).
• Added a method to compute conv without bias (#57512).
• Added support for computing conv with dynamic shapes (#57514).
• Added NNC lowerings for t/transpose/permute/expand (#57426).
• Updated external functions for mobile build (#56850).
• Added GELU To NNC (#57753).
• Implemented GELU Backward (#58249).
• Added a mobile NNC backend skeleton (#56852).
• Added support for torch.type (#51904)
• Added dict() constructor (#51934).
• Added a new torch::deploy to manage multiple python interpreters in a single process to deploy PyTorch models packaged with torch.package (#51754).
• Reintroduced static dispatch (#51957).
• Added TS support for torch.any (#52360).
• Added a demo backend with compiler (#52603).
• Added MKLDNN fuser (#51600).
• Added a context manager for hiding source ranges (#53188).
• Implemented embedding_bag for SR (#52429).
• Allowed the use of AliasDb in Python (#51336).
• Added support for DictConstruct (#54438)
• Added sliceHead/sliceTail APIs with short parameter list (#55115).
• Added logic to infer argument types in TorchScript (#56832).
• Added support for custom Python classes in CUDAFuture (#56516).
• Added a concat optimization pass (#55474).
• Added initial support for PEP-585 types (#57363).
• Added logic to infer types for arguments of methods not invoked directly by MonkeyType (#57202).
• Added support for torch.jit.ignore as a context manager (#55172).
• Implemented hardswish/hardsigmoid on MKLDNN tensors (#55218).
• Added model_dump tool for model inspection (#56868)
• Added static method support for TorchBind (#51177)
• Added TS support for pow (#52374)
• Added support for default argument values to TorchBind (#51253).
• Added support for AST rewriting for submodules (#52297).
• Added optimize_for_inference API (#58193).
• Registered aten::index_out (#51742).
• Added PYTORCH_TENSOREXPR_DONT_FUSE env variable to disable fusion on specified operators (#55650).

torch.package

• Allow TorchScript models to be contained in the package format (#54891,#56299,#54893, #57573, #54894, #57678).

Mobile

• Added 8x1 block sparse kernels for ARM and AArch64 (#51118, #51119, #51120).
• Made NNAPI converter handle binary ops combining NHWC+NCHW in some cases (#48812).
• Improved support for multiple inputs and outputs in NNAPI (#54697).
• Added flexible size support for NNAPI (#54701).
• Added new ops for Metal (concat, mul/sub/div, transpose, view, reshape, mean, chunk, reflection_pad2d) ( #53950, #54107, #54522, #56073, #56074, #58263).
• Added python binding to use mobile cpu allocator (#52323).
• Added lightweight RandomSampler for mobile (#58201).
• Added support for:
  • new ops to NNAPI converter (size, unsqueeze, cat, mean) (#52026, #48811).
  • multi-dimension tensors in Metal via MPSImage (#54106).
  • multiple output tensors in Metal (#56072).
  • methods other than forward in optimize_for_mobile (#53314).
  • ChannelsLast in TensorImageUtils on Android (#48990).
  • loading “extra files” in Java/Android (#55644).
  • loading “extra files” in Lite interpreter (#52635).
  • querying bytecode version in Lite interpreter and bytecode models (#56948, #56948).
  • exporting some older bytecode versions for Lite interpreter (#56802).
  • querying available ops (#57570).
• Added SqueezeNet to PyTorch Playground (71d0b5632b).
• Added libtorch lite build (#51419).

Distributed

• torch.distributed.Store
  • Added compare_set op (#51815).
  • Added new watchKey method to register callbacks on a key (#56217).
• torch.distributed.rpc
  • Allowed passing cpu to CUDA RPC device maps (#57019).
  • Add a new devices argument to TensorPipe options to specify set of devices for TensorPipe (#56405)
• DistributedDataParallel
  • Adds a flag to ddp join context manager that enables throwing an error across all ranks when this flag is specified (#56755)
  • Enable static graph training in DDP (#55248, #54995)
  • Log unused parameter names in DDP when crashing due to unused parameters (#55075)
  • Introduce torch.distributed.algorithms.default_hooks.fp16_compress_wrapper wrapper that can be combined with other communication hooks (#53808)
  • Support loading a non-DP/DDP model from a DP/DDP state_dict (#53224)
  • Enhanced logging in DDP for performance metrics (#52957, #53145, #54647)
• torch.distributed
  • Support work.result API for MPI backend (#57168)
  • Support work.result for ProcessGroupGloo::AsyncWork objects (#57565)
  • Support work.get_future() API for ProcessGroupMPI and ProcessGroupGloo (#57818,#57214)
  • New torch.distributed.monitored_barrier API (Gloo-only) (#53773, #53787, #55009, #55010, #55197, #55265, #55989, #55990)
  • Allow passing options field to process group initialization APIs (#53662, #54090, #53663)
  • Enable profiling for distributed collectives (#51822, , #52004, #52031, #52949, #55204, #56412, #56216, #56427)
  • Allow user to specify TORCH_DISTRIBUTED_DEBUG environment variable (#52481)
  • Added compareSet method for torch.distributed.{HashStore, FileStore} (#53803).
• Added new torch.distributed.elastic module that upstreams pytorch/elastic
  • Introduce RendezvousSettings (#56537)
  • Introduce a new from_backend static constructor for DynamicRendezvousHandler (#57150)
  • Introduce the implementation of DynamicRendezvousHandler (#57151)
  • add support for the new error file format (#57084)
  • Introduce the delay utility function (#56533)
  • Make torchelastic launcher compatible with the caffe2.distributed.launch (#55687)
  • Introduce PeriodicTimer (#55919)
  • Introduce DynamicRendezvousHandler and RendezvousBackend. (#55635)
  • Introduce C10dRendezvousBackend. (#55636)
  • Introduce EtcdRendezvousBackend. (#55637)
  • Added torch.distributed.elastic.launchers.api, torch.distributed.elastic.metrics, torch.distributed.events, torch.distributed.rendezvous, torch.distributed.elastic.agent modules (#55471, #53870, #53574, #53760, #53172, #54343)
  • Upstreamed timer and multiprocessing classes to torch.distribute.elastic.timer and torch.distributed.elastic.multiprocessing (#53574)
• torch.distributed.nn.RemoteModule: Enable RemoteModule to directly send GPU tensors over the wire on TensorPipe RPC backend if a device map is provided (#57288)
• torch.distributed.optim:
  • Allow torch.optim.Adamax to be used as a TorchScript functional optimizer in RPC (#55833)
  • Allow torch.optim.Rprop to be used as a TorchScript functional optimizer in RPC (#55834)

torch.fx

• Added torch.fx.Node.format_node() (#51737).
• Added a Transformer to normalize args/kwargs of torch.nn.functional calls into only kwargs (#51816).
• Added submodule manipulation APIs on GraphModule (#52358).
• Added Graph.eliminate_dead_code (#52658).
• Added a function to retrieve inspect.Signature instances for PyTorch operations (#53830).
• Experimental type annotation pass using Python signatures (#53831).
• Added a transformer to normalize torch namespace operations (#53832).
• Extended NormalizeArgs to work on torch namespace operations (#54236).
• Added FX optimize_for_inference for Intel CPUs (#53805, #58293).
• Added a metadata dict to Node and switch shape-prop to use that (#54926).
• Added C-level monkey patching of torch.randn to capture it during tracing (#54060).
• Added a new API replace_input_with to Node (#55887).
• Added net splitter and net minimizer utilities (#56201).
• Added PyTree support to FX through concrete_args (#55888).
• Added support for proxy-able classes (#56737).

ONNX

• Support onnxifi interface for set/get options (#52388).
• Support --onnxifi_min_ops in AOT flow (#52380).
• Redesign onnx pass to enable shape type dependent pattern conversion - cont (#51795) (#53304).
• Support inplace operations on inplace indexing (#52063) (#53306).
• Symbolic shape inference (#51481) (#53307).
• Support repeat_interleave symbolic (#52855) (#53312).
• Support primitive type input/outputs and attributes (#53550) (#54864).
• Support outer export to onnx (#53603) (#54869).
• Support hardsigmoid symbolic in opset 9 #49649 (#54193).
• Support support for hann_window operator (#54587) (#56163).
• Enable tensordot symbolic function (#55654) (#56166).
• Support for prim::min (#55259) (#56168).
• Support mv op (#55470) (#56169).
• Support .item() export & NumberType to tensor conversion (#55697) (#57594).
• Support a new operator for fill_() function (#56859) (#57596).
• Support index_add_ function (#56867) (#57830).
• Support tensor.to(device) (#56857) (#57599).
• Support registering custom export for prim::PythonOp from torch.autograd.Function (#55630) (#57600).

Vulkan

• Added the hardswish and hardsigmoid activation functions (#53362).
• Added the reflection_pad2d op (#53604).
• Added an implementation of Winograd convolutions (#54639).
• Added the sigmoid activation function (#57867).

Misc

• Android packages are now published to maven central (#53568).
• Kineto is now supported on Windows (#56323).
• Added a Gloo TCP_TLS transport (#56442).
• Add ability to collect minidumps after the crash (#59236).

Improvements

Python API

• Added nondeterministic alert for index_put_ when accumulate=False (#55827).
• Added deterministic path for torch.index_add on CUDA (#56521).
• Added deterministic path for torch.index_copy on CPU (#56900).
• Removed beta warning for use_deterministic_algorithms (#58074)
• Updated torch.Tensor.unflatten to be able to infer size value in sizes from -1 (#51955).
• Added a safe cast and copy for out= input tensor for torch.tensordot (#56286).
• Added cross-device check for out and input tensors for torch.cat (#53004).
• Modified the order of asserts to correct the error message when nan appears in torch.multinomial on CUDA (#53288).
• Converted a few more checks for unsupported device to raise NotImplementedError (#53610).
• Made shared cache thread-safe for torch.multiprocessing (#53750).
• Added support for torch.int32 indices in torch.repeat_interleave (#55102).
• Added a check to give a clear error message when a binary function is called for non-complex inputs with complex valued alpha (#54964).
• Propagate error message from torch_shm_manager when running torch.multiprocessing (#57307, #57310).
• Enabled deterministic path for index_copy_cuda with index_put (#58144).
• Added support for uppercase letters in torch.einsum (#56475).
• Added CUDA support for torch.orgqr (#51348) and torch.ormqr (#57316).
• Added support for batched as well as complex inputs for torch.geqrf on both CPU and CUDA (#56249, #56251).

Complex Numbers

• Fixed torch.{linspace, logspace} to correctly infer complex type and return a complex tensor when the start and (or) end values are complex numbers, and the dtype value is None (#38875).

Autograd

• Added support for single tensor in inputs argument for .backward() (#53827).
• Added support for C++ optional arguments in autograd custom functions (#54270).
• Added autograd support to torch.orgqr (#52637), torch.segment_reduce (#56792).
• Added deterministic backward for torch.gather for dim=1 (#55573).
• Make detach return an alias even under inference mode (#59633).

torch.nn

• Add 3D depthwise separable convolution (#51027)
• Make bias in lazy modules lazy and avoid creating empty tensors (#52212).
• BFloat16: enable prepacked weights's inference (#48922).
• Enable mkldnn conv2d backward to support mkldnn tensor input (#48994).
• Add OneDNN pooling backward (#49454).
• Add 64bit indexing support for softmax (#52713).
• nn.init._calculate_fan_in_and_fan_out: Support usage with __torch_function__ (#53522).
• nn.Transformer / nn.MultiheadAttention: Add batch_first argument (#55285).
• nn.Transformer: Add layer_norm_eps arg (#54494).
• nn.AvgPool2d: Add channels_last support on CPU (#48918).
• clip_grad_norm_: Add error_if_nonfinite flag (#53843, #55169).
• Module.train: Raise nicer error when called with invalid modes (#58247).
• nn.Linear: Support 0 in_features (#56505).
• nn.EmbeddingBag: Support mix of int32 and int64 offsets/indices (#55189).
• xnnpack::linear: Handle 1D input (#54986).
• nn.Module: Add allow_duplicate flag to named_modules() (#54812).
• nn.Module: Add to_empty() function for moving to a device without copying storage (#56610).
• Make pad_sequence callable from C++ API (#57868).

Dataloader

• Added generate_state for NumPy seeding (#56797).
• Modified construct_time_validation to argument_validation (#55836).
• Added mode to LoadFilesFromDisk (#57056).
• Added the ability to override reduce_ex function of DataPipe (#52858).
• Added lambda support to MapIterDataPipe (#52856).
• Added functional way of stacking DataPipes (#52885).

C++ API

• Suppressed unsigned comparison warning (#52653).
• Fixed constexpr host warning (#52702).
• Introduced a fluent API to construct tensors from external data (#54530).

AMD

• Allow PYTORCH_ROCM_ARCH in cpp_extension (#54341).
• Added support for torch.half dtype RNNs with MIOpen (#52475).
• Added support for the new hiprtc precompiler feature (#54350).
• Improved reliability of hipfft and rocfft detection for ROCm build (#53408).

CUDA

• Improved warning message when old GPU is detected (#56621)
• Made torch.cuda.amp.GradScaler scale updates in-place for better composability with graph capture (#55562).
• Add USE_MAGMA build flag (#55994).
• Change link order for BUILD_SPLIT_CUDA option (#58437).
• Improve CUDA-11.X binary builds (#58459).
• Move CUDA async warning to suffix (#59467).

torch.fx

• Make torch.fx.map_arg require a callable (#51907).
• Generalize dict key check in torch.fx.Tracer.create_arg (#51927).
• Customize traceback for calls to symbolically-traced code (#51648).
• Allow Transformer to accept output result that is not Proxy (#52473).
• Make TracerBase._find_user_frame private (#53654).
• Improve buffer registration during GraphModule init (#53444).
• Garbage collect values in Interpreter (#54726).
• Improve placeholder matching in subgraph rewriter (#54958).
• Record stride on Node during ShapeProp pass (#55108).
• Record memory_format on Node during ShapeProp pass (#55815).
• Put tensor metadata into a NamedTuple in ShapeProp (#55930).
• Preserve node meta info in split_module (#56212).
• Make shape_prop handle targets with aggregate outputs (#56221).
• Make arg normalization a method on Node and not a pass (also augment tests to be exhaustive) (#55992).
• Allow for args to be left as args in NormalizeArgs (#55995).
• Maintain submodule references during subgraph rewriting (#55463).
• Changes in order to move PythonKey out of tree (#57427).
• Handle cases in GraphDrawer when shape, type or stride are not present (#57845).
• Handle the case when output consumes get_attr directly in split_by_tags (#57844).
• Let submodules be collected as args/kwargs in symbolic tracing(#57840).

Profiler

• Expanded Kineto platform support (#56323).
• Added profiler fallback (#57612).
• Added CUDA event fallback (#58133).

TorchScript

• Added a flag to enable CPU fusion in benchmarks (#48612).
• Updated fusion to handle loops that have the same bounds as expressions (#55997).
• Updated normalization transformation to be in-place (#56158).
• Added check to only lower float conv2ds (#56289).
• Added more python bindings for loopnest (#56213).
• Updated fuseLoops API to return bool flag and not throw any exceptions (#56353).
• Added unroll and flatten APIs which do not require return stmt pointer (#56420).
• Updated Buf on mutation instead of creating a new one (#57513).
• Updated flatten transformation to be in-place (#56629).
• Added missing python bindings for NNC Stmts (#55570).
• Allowed backend preprocessing to take place outside of the backend interface (#51757)
• Added an error message for the case when with item is not an object (#52335).
• Enabled ModuleList non-literal indexing (#53410).
• Added recursive scripting for class type module attributes (#55124).
• Added support for mypy ignore annotation with particular rule specified (#51675).
• Added support for comparing two bool variables (#51844).
• Added MKLDNN GELU function (#53615).
• Added hardtanh(0,6) to the set of MKLDNN fusible ops for mobilenetv2 (#56203).
• Captured argument names for traced functions and modules (#51775).
• Improved has_bf16_support (#57408).
• Walk Python AST to check for unsupported attribute type annotations (#51805).
• Added out version for sum (#52225)
• Added logic to trace torch.nn.Linear as aten::linear (#51897).
• Made is_tracing scriptable (#49853).
• Added support for builtin sum (#52188).
• Fused clip_ranges and gather_ranges (#52461).
• Added support for features from to_backend for the Lite Interpreter (#52870).
• Added a filter to remove mutation (#51923).
• Added logic functionalize ops which to be included in MKLDNN group (#51924)
• Extended subgraph utils to cover merging a node following a subgraph (#52513)
• Included max pool in fusion groups (#52613).
• Registered both TupleConstruct and ListConstruct as out variants (#52684).
• Added Alias analysis to Memory Management/Planning (#50060).
• Included max pool in fusion groups (#52613).
• Added property binding in TorchBind (#50670).
• Registered pow out variant (#52454).
• Made torch.load() aware of import path changes (#53139).
• Added aten::to copy out variant (#52343).
• Added more variants to create_empty_from (#53333).
• Added support for parsing Ellipsis in JIT frontend (#53576).
• Added a bool is_available() method to the backend contract (#53068).
• Added parallel support for the LLVM backend. (#53243) / Resubmit: Add parallel support for the LLVM backend. (#54122).
• Rewrote functional.tensordot to be TorchScript-able (#53672).
• Added python bindings for missing loop transformations in LoopNest (#54355).
• Added support for list insertion for mutation removal (#54271).
• Added support for torch.bfloat16 in the fuser (#54571).
• Added some functions for manipulating MKLDNN tensors to TORCH_API (#56954).
• Merged CUDA Streams and Events (#53902).
• Added python bindings for TensorExprKernel (#54450).
• Added support for dtype-specific tensor subclasses (e.g. LongTensor) (#54817).
• Added support for tuple add operator (#52292).
• Disambiguated error message for working with not fully refined tuple types (#55745).
• Allowed unpacking tuple and assigning unpacked values to SELECT-type expressions (#55268).
• Made NoneType annotation_str emit NoneType instead of None (#54746).
• Added CUDA device synchronization support in JIT (#55469).
• Added optimize_graph_output_memory flag (#55811).
• Added support for refinement for torch.jit.Future (#56148).
• Added implicit conversion from null tensor to NoneType (#55823).
• Added aten::matmuls to TE fuser (#54605).
• Put explicit error message on class attribute accesses (#55723).
• Added support for constant tensors in tensorexpr kernel (#56319).
• Added native support for aten::getitem (#55310).
• Added stricter check for function schemas with varargs (#56509).
• Added graceful failure handling of DataPtr extraction in CUDAFuture (#56511).
• Enabled forward/backward compatibility in TS mobile (#56079).
• Added binding for aten::clamp_min_out (#56635), aten::argmin_out (#56638), and aten::norm_out (#56636).
• Enhanced error message for Future.setErrorIfNeeded (#56631).
• Added type inference support for nn.Module methods using PDT (#57165).
• Disabled conv-add-relu fusion for cuDNN7 when model uses torch.float16 (#56579).
• Enabled conv-add-relu fusion as a part of frozen graph optimization (#56580).
• Reduced inline autodiff threshold to enable the capture of smaller fusions (#57062).
• Added static runtime support for aten::matmul (#57291).
• Added device() method to c10::Event (#57293).
• Added support for normalization of is op (#57862).
• Enabled cat without conditionals iff CPU (#58026).
• Added LowerSimpleTuples for freeze tuples (#57915).
• Added support for striding for list slicing (#49352).
• Wrapped torch::deploy API functions in safe rethrow macros (#58192).
• Added binding for aten::div_out (#56653)
• Added binding for aten::sub_out (#56656).
• Supported clamp.Tensor (#58191).
• Added an out version for aten::repeat (#57683).
• Added default arguments to CUDA stream and events (#53025).
• Added support for linear in MKLDNN fusion (#51484).
• Handled MKLDNN broadcasting in MKLDNN fuser (#51736).
• Added 0-dim support for binary MKLDNN ops (#51921).
• Added OneDNN relu backward and reshape backward (#49455).
• Added OneDNN batch_norm backward (#50460).
• Added support for hardshrink (#57749).
• Added non mutator bundled inputs method (#58408).
• Added support to compare devices (#53045).
• Added support for memory_arg in aten::clone (#58100).
• Implemented aten::cat without conditionals (#53128).
• Added external function bindings (#53420).
• Added out variant of sigrid_transforms_torch_bind and ListUnpack (#54761).

torch.package

• Added a reliable method for determining if a file is part of Python’s standard library (#51694).
• Made package code more composable with other parts of PyTorch (package GraphModule, load non-code files from package) (#51674, #51976).
• Improved debugging facilities (allow_empty flag, zip file viewer, deny instruction, dependency tracing, query if object is from a package) (#53232,#53233, #52176, #55167, #56190, #56238, #56729).
• Allow save_module to accept module as arg (#55996).
• Follow dependencies created by __import__ calls (#55153).
• Added hooks to exporters’ mock and extern calls to take action when a module is matched (#58000)
• Turn the default behavior of packaging into an ‘intern’ action so that it can be ordered with repeat to mock, extern, and deny actions (#57341).

Quantization

• Added support for keeping output quantized for list and dict (#56391).
• Added torch.float16 and torch.float64 support to fake_quantize_per_channel (#56894).
• Support preserving attributes in deepcopy of observed/quantized graphmodule (#56550).
• Added support for packed params in state_dict (#51639).
• Added support for fusing Conv3d + BatchNorm3d + ReLU operations (#50003).
• Change back to multiple_outputs_gpu_kernel for learnable fake per-channel quantization (#52017).
• Added torch.float16 and torch.float32 support to fake_quantize_per_tensor (#52612).
• Support batched embeddings for 8 Bit embedding bag quantization (#55343).
• Expose nbins and ratio for quantized::embedding_bag_4bit_prepack (#50398).

Mobile

• Removed caching of inflated bundled inputs (#55181).
• Improved exception reporting for Lite interpreter (#54284, #55062, #55252).
• Improved forward/backward compatibility in Lite interpreter when adding new optional arguments to ops (#56845).
• Added model size to logged metadata when loading a Lite interpreter model (#53578).
• Benchmarking binary speed_benchmark_torch now supports Lite interpreter (#55402).

Distributed

torch.distributed.Store

• Update compare_set for other Store implementations to be the same as TCPStore. (#57175)
• torch.distributed.Store: Expose C++ compare_set API to python. (#57191)
• torch.distributed.Store: Add timeout, host, port to TCPStore’s python API as accessors. (#52784)
• Allow world_size and is_master to be optional when constructing TCPStore. (#51809)
• Add wait_for_worker param to TCPStore’s Python API(#52888)

torch.distributed.rpc

• Allow RRef to be created with a specified set of CUDA devices (#57085)
• Correctness fixes for CUDA support in RPC framework (#54024, )
• Refactor RPC agent to use Store to collect and verify name (#53209, #53202)

DistributedDataParallel

• Make unused parameter search show up in profiler output (#57376)
• Update DDP communication hooks to divide by world size before all_reduce to avoid overflow (#57410)
• Stabilize torch.distributed.GradBucket interface for gradient compression (#53010, #53098, #53102, #53009, #53099)
• Skip CPU to GPU input copy if input is already on the right device. (#55624)
• Record forward pass of DistributedDataParallel and DataParallel in profiler.(#55578)
• Make orthogonalization_epsilon flag configurable in torch.distributed.algorithms.ddp_comm_hooks.powerSGD_hook.PowerSGDState (#55738)
• Set default value of start_powerSGD_iter to 1K iterations in torch.distributed.algorithms.ddp_comm_hooks.powerSGD_hook. (#55272)
• Add a minimum compression rate threshold parameter for torch.distributed.algorithms.ddp_comm_hooks.powerSGD_hook (#52541)
• Report compression rate for batched PowerSGD hook (#55103)
• Enable gradient compression hook testing on ROCm (#52403)
• Enhance warning for unused parameters in DistributedDataParallel. (#52385)
• Enhance error messages when crashing with unused parameters in DistributedDataParallel. (#52391)

torch.distributed

• Add rank information on NCCL communicator abort (#57974)
• Enhance exception logging in NCCL (#54557, #54558, #54117)

torch.distributed.nn.RemoteModule

• Create a separate remote module template when moving CPU tensors to a cuda device is not enabled (#57413)
• Allow passing RemoteModule as an argument over RPC (#57695, #58345)
• Support async instantiation of RemoteModule (#58052)
• Place inputs on the appropriate devices in RemoteModule (#56943)

torch.futures.Future

• Enable torch.futures.Future to be created with CUDA support (#56517)
• torch.futures: Improve error propagation when using then API (#54475)

torch.nn.SyncBatchNorm

• Migrate apex.parallel.SyncBatchNorm channels_last to PyTorch implementation (#46906)
• Fix SyncBatchNorm’s forward pass to handle optional weight (#54568)

torch.distributed.pipeline

• torch.distributed.pipeline: Merge pipeline partitions that are on the same device. (#55973)

Added new torch.distributed.elastic module that upstreams pytorch/elastic

• Rename torch.distributed.elastic_launch to torch.distributed.run (#56831)
• make process failure init error non-fatal (#56739)
• Reorder type definitions in dynamic_rendezvous.py (#56534)
• Revise the rendezvous handler registry logic. (#55466)
• Set error code in reply file when child process is terminated by signals. (f665a7f8a1)
• Make sure torchelastic mp wait for queue to be drained before finishing the process (#55412)
• Revise the rendezvous exception types. (#54803)
• Expose a stderr parameter in EtcdServer. (#54805)
• Improve the implementation of the utility functions and add their unit tests. (#54804)
• Improve the implementation of RendezvousParameters and add its unit tests. (#54807)

torch.distributed.optim.ZeroRedundancyOptimizer

• Add an option for buckets to be views of tensors and consolidate public interface (#52987)
• Make state dict for ZeroRedundancyOptimizer world size independent (#52960)

Combine backtrace print into one string to avoid interleaving (#56961). Raise exception rather than crash if GLOO_DEVICE_TRANSPORT is set to unknown value (#58518).

ONNX

• Updated fuseLogSoftmaxNllLoss function to handle autocasting (#51729) (#52349).
• Added support for sequence of tensor mutations in blocks (#51577) (#52347).
• Updated LayerNorm symbolic to handle autocasting (#52199) (#52350).
• Restored fast path in OnnxifiOp::adjustOutputBatchSize (#52498).
• Improved index_put symbolic to handle singular Bool updates (#53690) (#54863).
• Replaced decomposeLinear pre process pass with a symbolic (#53077) (#54866).
• Improved assign input shape for tuple inputs & primitive type inputs (#54112) (#56164).
• Updated repeat_interleave symbolic (#54312) (#56165).
• Enabled word_language_model GRU and LSTM scripting (#54310) (#56170).
• Added standardOps match more input type in ORT (#53813) (#56172).
• Redesigned in-place conversion (#55033) (#56173).
• Handled PackedParams inputs for _propagate_and_assign_input_shapes (#56449) (#57079).
• Added a warning for the case when len is used to calculate tensor shape (#55151) (#57595).
• Added special post processing for onnx::Cast and onnx::ConstantOfShape shape type inference (#55962) (#57597).
• Handled NoneType in Assign Output Shapes (#54623) (#57602).
• ListUnpack on dynamic tensor list (#56592) (#57603).
• Handled mixed mask, index input for index_put (#57604).
• Handled incorrect format for example_outputs (#55802) (#57829).
• Enabled several script unit tests using new jit passes (#51722) (#53309).

Vulkan

• Enabled broadcasting for arithmetic ops (add, sub, mul, and div) (#52842).
• Reduced size of compiled shaders by using the -Os flag when calling glslc (#57199).
• The vulkan optimization JIT pass now adds an optimized_for_vulkan attribute to the model (#56414).

Benchmark

• Quality of life improvements to Timer (#53294)
• Add repeats to Timer.collect_callgrind(...) (#54484)

Misc

• Auto-detect ccache to speed up developer builds (#49389).
• Catch and ignore tracebacks for compilation errors (#55986).
• Register DefaultBackend implementations for functional/inplace structured operators (#53037).
• Improved support for oneDNN on AArch64 when building from src (#55913).

Bug fixes

Python API

• Updated torch.lerp to make weights tensor broadcast-able (#52319).
• Fixed print for negative torch.int8 tensors on ARM64 (#52616).
• Fixed type annotation for as_tuple to clearly determine what torch.nonzero will resolve to (#51635).
• Fixed torch.logcumsumexp to correctly handle infs and nans (#52947).
• Fixed torch.topk for k=0 on CUDA by skipping the kernel launch in this case (#58086).
• Fixed a bug for optimizers to have the hyper parameters be still defined when all parameters have no grad (#52944).
• Fixed type promotion issue for torch.pow (#54085).
• Fixed torch.min() and torch.max() to work on a non-empty dimension for tensors with 0 elements (#52565).
• Fixed the upper bound computation for torch.randperm (#56967).
• Allowed std=0 in torch.normal, and added checks to consistently error out if std<0 (#51317)
• Fixed torch.index_fill to output 0-dim tensor for a 0-dim input tensor (#52209).
• Fixed mul_() to correctly work for Mkldnn tensors (#51758).
• Fixed temp file/bind race condition in torch_shm_manager for torch.multiprocessing (#57309).
• Fixed tempfile address binding in torch_shm_manager to be destructed correctly for torch.multiprocessing (#57566).
• Fixed torch.multinomial to never select an element with 0 weight for torch.half (already works correctly for other datatypes) (#53480).
• Fixed a bug in assertRaises NotImplemented handling when no exception is thrown (#54126).
• Fixed override for __iter__ (#54702).
• Fixed segmentation fault for torch.floor_divide when compiling on ARM64 (#55608).
• Fixed torch.digamma’s inconsistency with SciPy’s digamma (#56689).
• Fixed torch.cat to return correct result for non-contiguous tensors (#57177).
• Fixed distributions for torch.distributions.log_prob which don't properly honor validate_args=False (#53600).
• De-prioritized Dimname and DimnameList in python overload resolution (#51350).
• Fixed the handling of scalar and zero dimensional inputs as well to torch.take() and torch.Tensor.put_ on both CPU and CUDA (#53356).
• Fixed a bug to not rebuild extensions for every import (#56015).
• Fixed error message for torch.as_strided (#53198).
• Added correct handling for tensor allocation for large tensors when using torch.resize on CUDA (#52672).
• Fixed an illegal memory access that could happen when computing the inverse of a batch of matrices on CUDA (#53064).
• Fixed a bug where torch.sparse.addmm would compute the wrong results for CUDA inputs when beta was not zero or one (#56160).
• Fixed a bug where torch.sparse.sparse_coo_tensor’s gradient could be calculated incorrectly (#50361).
• pow: Fixed a bug caused for mixed cpu/cuda input tensors (#53669).
• sub: Fixed a sub.Scalar bug (#53679).
• Fixed torch.unique for discontiguous inputs (#59003).
• Fixed torch.randperm on CUDA (#59352).
• Fix torch.reciprocal for torch.float32 on ARMv8 (#59361).
• Disable overloading of std::max & std::min for inputs of different types, which could cause accuracy loss (#55638)

Complex Numbers

• Added custom implementation for sqrt and acos to be used if libc++ is used to reduce numerical error for edge cases. (#52018, #54820, #52287).

Autograd

• Fixed
  • torch.autograd.gradgradcheck when outputs are independent of the inputs (#58049).
  • torch.utils.checkpoint to behave properly when an error happens during forward (#51746).
  • autograd’s graph discovery when output is a leaf that requires gradients (#51940).
  • some cases where torch.autograd.gradcheck did not return the correct value when raise_exception=False (#53916) .
  • thread local state not being properly propagated for some operations during the backward pass (#56174).
  • torch.index_fill_ formula to support duplicate indices (#57101).
  • derivative of torch.sinc around x=0 (#56763, #56986).
  • torch.cdist backward formula to correctly support broadcasting (#56605) and empty inputs (#56606).
  • view creation metadata for functions that return multiple views in no_grad or inference mode. (#57842).
  • autograd.functional.* functions to work in no_grad mode (#47543).
  • rare deadlocks on exit due to autograd worker threads (#53170).

torch.nn

• nn.AdaptiveAveragePooling: Fix crash for integral inputs (#51443).
• F.normalize: Fix to make it properly scriptable (#51909).
• nn.parallel.scatter_gather.gather: Fix to handle NamedTuples and moving output to CPU (#51104).
• fractional_max_pool{2/3}d : Fix segfaults for incorrect kernel_size and output_size (#51626).
• nn.CosineEmbeddingLoss: Validate target has correct shape (#53110).
• Fix multiprocessing serialization for integer parameters on CUDA (#56529).
• nn.Softplus: Fix backwards computation by comparing input against beta * threshold (#56484).
• addmm_: Add check to disallow resizing the input tensor for the in-place variation on CPU (#56452).
• nn.InstanceNorm*d: Fix to perform correct input size check (#56659).
• nn.CTCLoss: Fix backward pass regression on cuDNN (#56639).
• nn.ConvTranspose*d: Fix regression that broke padding with a list of values (#54911).
• F.max_pool3d: Fix illegal memory access for large inputs on CUDA by doing multiplication in int64 (#52828).
• F.embedding: Support __torch_function__ (#54478).
• nn.ChannelShuffle: Remove NamedTensor warnings (#55911).
• mkldnn_linear: Fix incorrect results for non-contiguous inputs (#51713).
• nn.ModuleList / nn.ModuleDict: Raise NotImplementedError for forward() (#48785).
• Change maybe_resize_storage_cpu new_size arg to unsigned (#52671).
• nn.LSTM: Fix regression that broke loading older serialized modules (#57558).
• F.reflection_pad2d: Fix CUDA launch error (#56451).
• Fix wrong detection of depthwise convolution on neon (#55794).
• Re-enable fast winograd convolution on IOS (#56021).
• gaussian_nll_loss: Fix incorrect reduction=‘none’ behavior (#56469).
• Fix misaligned access #56325 (#56403).
• Use native CTC loss for target length 256 (#53557).
• register_full_backward_hook: Fix crash when first argument doesn't require a gradient (#57945).
• Remove asserts of Tensor type and ignore mypy checks to support __torch_function__ usage (#57458).
• Handle stride > 1 with im2col in CUDA thnn conv2d (#54080).
• Add device id to ConvolutionParams (#50892).
• Enabling OneDNN for group convolution (#54890).
• nn.AdaptiveAveragePooling3d: Add AccumulateType for CUDA (#53607).
• Do not use depthwise3x3 conv in grad mode for ARM (#56889).
• Fix type annotations for state_dict() override (#55704).
• Pass contiguous weight to NNPACK convolution (#56569).
• nn.EmbeddingBag: Mark backward as non-deterministic for max mode rather than all reducing modes (#55574).
• nn.EmbeddingBag: Initialize bag_size output with zeros to make it deterministic (#56661).
• nn.EmbeddingBag: Support the empty bag case on CPU (#57446).
• Fix nn.MHA + quantized scriptability (#58727).
• Fixes cuDNN performance on A100 (#58287, #59721, #59744, #59802).

Dataloader

• Fixed type hints of the callable DataLoader arguments (#52924).
• Added a keyword arg to meta and support abc for typing (#58450).
• Fixed a bug to use generator instead of self.generator in the RandomSampler (#52956).

C++ API

• Fixed the lifetime of PyTensorType (#51649).
• Fixed linker failure with ambiguous namespaces (#45736).
• Fix Scalar output formatting (#53229)
• Fix printing of optional string arguments in schemas (#55196)

AMD

• Fixed hipfft transform type error (#53411).
• Load only hipfft for ROCm > 4.1 (#54349).

CUDA

• Added torch.scatter_add to torch.cuda.amp promote list (#52133).
• Fixed segfault in distributed process group due to IPC (#53080).
• Fixed multinomial CUDA misalignment and non-deterministic behavior (#55364).
• Replaced raw cudaMalloc in torch.sparse code (#57083).
• [CUDA graphs] Added proper sync after replay (#57556).
• Fixed NVRTC versioning for CUDA 11.X (X>=3), CUDA 12 and later (#57204).
• Fixed a correctness issue of CUDA channels-last nn.SyncBatchNorm (#57077).
• Fixed CUDA caching allocator when trying to allocate ~2^64 memory (#57571).
• Fixed raw_deleter() bug with PYTORCH_NO_CUDA_MEMORY_CACHING=1 (#54775).
• Fixed undefined symbol for CUDA 11.1 Windows (#52506).
• Automatically set BUILD_SPLIT_CUDA for cpp extensions (#52503).
• Adds grid_sampler to the list of operations that can autocast torch.float32 (#58679).

Dispatcher

• Fix boxing/unboxing for Scalar bool values (#53228)
• Fix inaccurate dispatch table for fill_ (#53611)
• Fix inaccurate dispatch tables (#54127)
• Fix issue with dispatch key: AutogradXPU (#56336)
• Modify DispatchKeyExtractor to also work for optional Tensors (#58283)
• Extract dispatch keys from optional Tensors (unboxed) (#58296)

torch.fx

• Preserve leaf modules in Transformer (#51998).
• Fix tuple type annotations in FX codebase (#52010).
• Fix type correctness on GraphModule.graph (#54305).
• Remove forward from forward.__globals__ to facilitate retracing (#54011).
• Fix ScriptMethod dispatch on __torch_function__ (#56103).
• Fix type_matches for Optional[List[int]] arguments to make NormalizeArgs more permissive (#56790).
• Fix NormalizeArgs issues with lists of tensors (#57004).
• Changed parametric type error in NormalizeArgs to a warning (#57183).
• Make NormalizeArgs not save output node in the node_map (#58058).

Profiler

• Fixed intermittent CUDA activity flush issue (https://github.com/pytorch/kineto/pull/95).
• Handled empty trace (#58013).
• Added cuda synchronization points (#56651).
• Removed usage of onEachDevice from legacy profiler (#54125).
• Fixed double printing of FLOPs (#56974).

TorchScript

• Fixed jit.trace mishandling of InterfaceType (#53052).
• Made reshape/flatten deterministic (#54353).
• Added logic to use is_buffer in BufferPolicy::valid (#49588).
• Updated NNC to sanitize input names (#52786).
• Handled ExternalCalls in LoadStore analysis and Inliner (#52628).
• Fixed output restriding of size-1 dimensions (#58256).
• Handled non literal constant bounds in Unroll (#53029).
• Fixed a case where inlining wouldn't work because dim-size was 1 (#53254).
• Removed cached argv from LLVMCodeGen to fix race condition (#54286).
• Lowered scalar constants as doubles/longs (#54824).
• Added a check to not try to vectorize kernels that use float16 (#55970).
• Added a check to not fuse torch.float16 on CPU (#56119).
• Fixed float->bool conversion on CPU (#57798).
• Fixed handling of the arguments of aten::to (#58028).
• Don’t error on 0-dim in convolution (#51922).
• Allow __exit__ to have a return value (#52336).
• Added metacompile of ternary if (#51789).
• Keep alive graph when creating iterators from it (#51951).
• Fixed return value of IValue::to for Tensor/String (#51463).
• Added function to check for memory leak (#52342).
• Ignore user annotated ignored attributes (#52367).
• Fixed jit.trace mishandling of InterfaceType (#53052).
• Fixed tracing support for TorchBind (#52884).
• Use correct warning type for tracer warnings (#53460).
• Removed the assumption that forward exists in freeze_module (#52918).
• Removed notion of "level" from Module::dump_to_str (#52539).
• Made IValue::toTensor() inline-able (#53213).
• Consider normal_ as a special operation in the remove mutation pass (#52175).
• Updated set_stream API to change the device (#53741).
• Only run ReplaceWithCopy pass when enable_out_variant is true (#54111).
• Disable dfusion group that is not supported by XPU device (#54239).
• Don’t require same-sized src/dest in reshape_copy (#54467).
• Fixed TupleType.annotation_str to conform to typing module syntax for empty tuple type (#54641).
• Made NoneType annotation_str emit NoneType instead of None (#54642).
• Made sure the copy version of the op exists in ReplaceWithCopy (#55337).
• Included conv3d in conv-add-relu fusion (#54772).
• Added cond-add-relu matching pattern to cover in-place ops (#55458).
• Fixed TupleType.annotation_str to conform to typing module syntax for empty tuple type (#54745).
• Fixed Optional[Tensor] type in autodiff (#55565).
• Raise TypeErrors when IValue::getSubValues fails (#56510).
• Fixed num args for to_copy (#56441)
• Fixed error in JIT CUDA on ROCm (#55243).
• Fixed a bug in emitUse to drop all values that are marked as drop (#56652).
• Fixed default dtype for randperm and triu/tril_indices inside TorchScript (#57105).
• Don't allow create() on singleton types (#56807).
• Fix GIL mutithreading issue exposed by torch::jit::toIValue() (#57688).
• Fold NaiveSyncBatchNorm when folding batch norm (#57823).
• Fix UB in LoopNest::distribute (#57883).
• Fix a condition when we use a native depthwise conv2d lowering (#57906).
• Ensure torch.save() has deterministic output (#57536)
• Fixed hasattr support type (#57950)
• Return nullptr if the number of input args doesn't match (#58018).
• Added fix for missing ops aten::sorted.str (#58339).
• Fixed deadlock in Future due to lock inversion with GIL (#58382).
• Added logic to prevent lock inversions with GIL in Future (#58391).
• Fixed MKLDNN_add in-place behavior (#51687).
• Use MKLDNN copy for copy_ when self and src are MKLDNN layout (#54248) .
• Fixed default to align with documentation in fuser.py (#53457).
• Fixed upcoming changes that are part of ROCm 4.2 and affect PyTorch JIT (#57400).
• Fix for improper mobile and torch.package serialization (#59642).

torch.package

• Add cpython as a dependency for torch_python_obj (#56740).
• Catch exceptions where dependency resolution gets invalid imports (#58573).
• Simplifications to broken dependency handling (#58572).

Quantization

• Fixed conv packed param serialization in state_dict (#52787).
• Fixed torch.float16 dynamic quant for functional linear (#52369).
• Fixed prepacking for F.conv1d (#55311).
• MHA tensor assignment fix (#53031).
• Fixed conv transpose with qconfig == None (#52844).
• Quant norm layers: move scale + zp to buffers (#52861).
• Handled the case when observed node has no users (#53210).
• Only insert observers for fixed qparam ops (#53330).
• Fixed a condition check for CopyNode (#53585).
• Fix for x.ndim followed by sub (#53120).
• Fixed using size of quant layer in torch._assert (#53187).
• Fixed fx quant for quant_layer -> stack -> sum (#53196).
• Fixed deepcopy on quantized ConvNd (#56154)
• Fixed getitem for unmatched nodes (#57173).
• Made quantizeable MHA work with torch.jit.script (#57774).
• Fixed quantize_per_tensor on CUDA (#57703).
• Fixed a bug to handle bias in rowwise quantization of FC (#58022).
• Skipped inserting observer for boolean Tensors (#57375).
• Fixed torch.float16 reference patterns for linear (#55727).
• FX Quant:
  • Fixed edge case with copynode after user function (#55710).
  • Fixed subtle bug in BinaryOpQuantizeHanlder logic in matching (#56294).
  • Fixed bug with fusion patterns and disabling quantization (#54654).
• Fixed overflow issue in quantized instance_norm/layer_norm/group_norm (#54872).
• Fixed zero_point rounding for _fake_quantize_learnable_per_channel_affine (#52290).
• Bug fix to update requantization and zp parameters of input (#52797).
• Fix embedding bag bug accessing unaligned memory (#53300).
• Fix out variant for 4bit embedding bag (#55096).
• Avoid tensor refcount bumps on embedding bag (#55023).

Mobile

• Fixed some bugs in the implementation of various functions on iOS GPU:
  • max_pool_2d when padding is used (#52431).
  • softmax (#54519).
  • binary element-wise ops to handle inputs with different number of dimensions (#58262).
• Removed duplication of constant tensors in model when using Lite interpreter (#58182, #56002).
• Banned mutating operators in mobile GPU models (#56070).
• Use lite interpreter as default and bump model version (#58630)

Distributed

torch.distributed.Store

• Fix flag specifying whether there is more data for TCPStore delete key (#53886)
• Properly enforce timeout for PrefixStore. (#53928)
• Fix TCPStore wait hang when key is previously set (#53860)
• Properly order TCPStore’s compare_set parameters in Python API (#52696)
• Fix resource leak bug in TCPStore constructor (#52860)

torch.distributed.rpc

• Several fixes for CUDA support in the RPC framework (#57926, #57432, #57394, #57443, #57487, #58384, #51820, #57792, #56895, #54932)
• Fix possible reference cycle by passing reference to parent future in RPC callbacks (#57635)
• Fix RPC get_worker_info for rank 0 (#52804)
• Fix crash when TensorPipe agent tries to double-set errors. (#52837)

torch.distributed

• Fix path handling on Windows during rendezvous process (#57000)
• Fix and re-enable ProcessGroupMPITest (#56709)

DistributedDataParallel

• Correct the usage of min_compression_rate in gradient compression communication hooks (#52979)
• Fix mapping of parameter to parameter names when certain parameters don’t require gradient (#57771)
• Skip rebuild buckets in DistributedDataParallel when running under no_grad mode. (#54159)
• Fix a race condition in DistributedDataParallel when all parameters are used but running with find_unused_parameters=True. (#53160)
• In DistributedDataParallel, pass in process_group argument into dist.get_rank calls (#53793)
• Fix DistributedDataParallel’s process for verifying model consistency during initialization. (#52887)

torch.distributed

• Check vector boundaries in torch::cuda::scatter (#53057)
• Release GIL before destructing ProcessGroup classes (#56381)

torch.distributed.pipeline

• Fix hang in pipeline destructor by removing join_workers (#53433)

torch.distributed.elastic

• Resolve bug around incorrect rendezvous handler resolution (#56386)

torch.nn.SyncBatchNorm

• Ensure SyncBatchNorm behaves like a regular BatchNorm layer in eval mode. (#56982)

torch.distributed.optim.ZeroRedundancyOptimizer

• Typing fixes(#53165)

Fix monitored_barrier with wait_all_ranks (#58702).

ONNX

• Removed the last Cast in pow symbolic_opset9 (#52646) (#53305).
• Fixed export of copy_ operator (#53046) (#53310) (#51938) (#54870).
• Fixed export of embedding with padding_idx (#53053) (#53530).
• Fixed onnx warning message (#54371).
• Improved error message during Glow ONNXIFI (#58069).
• Fixed if output shape mismatch error & graph input directly used as output (#53219) (#54865).
• Fixed ComputeShapeFromReshape when input_shape_size < reshape_size (#56171).
• Fixed -Wrange-loop-construct in onnx_exporter.cc (#56759).
• Print onnxifi failed status code in readable format (#53648).

Vulkan

• Fixed kernel registration errors in Vulkan test and benchmark binaries by adding nonVarTypeModeGuard (#52535).
• Fixed the glslc path in CMake for desktop builds (#56507).
• Fixed build failures caused by warnings-treated-as-error for Linux builds. (#52781).
• Remove constant duplication for Vulkan optimize_for_mobile (#59276).

Benchmark

• Fix timer overflow on small, fast snippets (#55200)

Misc

• [memory format] Fixed channels last bug in upsample kernels to now correctly pass memory_format information from the input to the output tensors (#53535).
• [memory format] Fixed silent correctness bug for CUDA upsample kernels to correctly handle torch.channels_last contiguous tensors (#54744).
• Workaround intermittent gcc-7.5 ICE in cpp tests (#57016).
• Improve build quality on Windows (#52729, #53562, #54132, #55275).
• Search for static OpenBLAS compiled with OpenMP (#59428).

Performance

Python API

• Optimized memory usage for out= version of torch.logsumexp (#51239).
• Added vectorization for torch.floor_divide (#55380).
• Reimplemented torch.flip() using advanced indexing (#56713).
• Improved performance for torch.take() and torch.Tensor.put_ on both CPU and CUDA (#53356)
• Generic performance improvement for operations performed on non-contiguous 2-dimensional tensors (#53613).
• Added vectorization for torch.copysign on CPU (#51792).
• Improved performance for bilinear interpolation on CPU (#51653).
• Improved performance for backward computations on torch.cumsum and torch.cumprod on both CPU and CUDA (#53711).
• Improved performance for torch.Tensor.copy_ when performing copies between small tensors of torch.float and torch.half data types (#53800).
• Enabled vectorization for torch.Tensor.copy_ and torch.cat for BFloat16 tensors (#54671, #54674).
• Added a fast path for a common case for torch.addmm on CUDA (#55026).
• In collaboration with NVIDIA, the CUDA performance of many linear algebra operations has been improved by increasing use of the cuSOLVER and cuBLAS libraries
  • Added cuBLAS support for torch.triangular_solve (#53147) and batched torch.geqrf (#56253).
  • Added cuSOLVER support for torch.linalg.eigh/eigvalsh (#53040), torch.cholesky_solve (#54315), torch.cholesky_inverse (#54676), and torch.linalg.qr (#56256).
  • Added cuBLAS and cuSOLVER support for torch.linalg.lstsq (#57317).
• Improved performance for torch.nonzero (#58468).
• Removed device check from a few indexing methods (#58800).

Complex Numbers

• Added a faster path for torch.is_complex() by skipping unnecessary dispatch (#50054).

Autograd

• Sped up autograd’s graph discovery algorithm by skipping some nodes using sequence number (#52180, #52057).
• Added a new fast gradcheck (#54480).

torch.nn

• Module.forward: Add fast path for the case of no hooks (#52576).
• Fix mkldnn heuristic for multithreaded convolution (#52909).
• linear: Remove one refcount bump (#54936).
• Improve native_batch_norm_backward performance on CUDA (#58240).
• nll_loss: Use cascade summation on CPU (#55841).
• nn.BatchNorm1d: Improve training performance on CPU (#57033).
• Simplify convolution double backward gradInput formulas (#54840).
• Move RNN cell size check to cpp (#51964).
• Remove syncs in one_hot (#57902).
• Enable and enhance bf16 threshold (#54384).
• nn.Conv3d: Enable channels_last_3d for cuDNN (#48430).
• Increase token count threshold for calling thrust sort in embedding backward (#49913).
• CPU convolution benchmark harness for some popular models (#56455).
• Improved performance for torch.nn.BatchNorm1d on both CPU and CUDA (#57033, #57786).
• Added optimized generic interpolation for torch.nn.functional.{upsample_nearest, upsample_bicubic} and speed up for channels first and last cases (#54500).
• Added shape documentation for CosineEmbeddingLoss (#58403).

C++ API

• Fixed nest openmp performance bug in thnn_conv2d (#52577).
• Added c10::MaybeOwned and Tensor::expect_contiguous (#53317)
• Added DimVector variant of infer_size (#54882)
• Added logic to use DimVector for inputs to as_strided that don't grow dim (#55016).
• Reduce ref-counting by borrowing in/out Tensors in TensorIterator (#55690).
• Reduce ref-counting by migrating add operators to borrow Tensors in TensorIteratorBase (#55691).
• Reduce ref-counting by migrating copy_ operators to borrow input/output Tensors (#56031).
• Added logic to use expect_contiguous in layer_norm (#58067).

CUDA

• Construct only necessary elements in OffsetCalculator (#55107).
• Migrated torch.index_put to use cub instead of thrust (#55693).
• Added cuSOLVER potrf and potrfBatched to the backend of torch.cholesky_decomposition (#53104).
• Implemented torch.sort with cub::DeviceSegmentedRadixSort (#56821).
• Added cuSOLVER path for torch.geqrf (#56252).
• Enabled cuSOLVER torch.potrf batched for Cholesky decomposition when CUDA >= 11.3 (#57788).
• Fewer CUDA sync in unique by using cub instead of thrust (#57323).
• Removed sync for randperm on small tensors (#54113).
• Simplify convolution double backward gradInput formulas (#54840).

Composability

• We’ve landed lots of performance optimizations for 1.9, both large and small. See individual PRs for details:
  • Inline tensor.device() (#50848)
  • Skip a second call to shouldUseRecordFunction for BackendSelect ops (#50891)
  • Re-order TensorImpl fields to save a word (#50920)
  • Devirtualize TensorImpl::storage() (#51050)
  • Reduce template expansion in call_functor_with_args_from_stack (build time) (#51313)
  • Eliminate WrapFunctionIntoRuntimeFunctor use in CppFunction constructors (#51315)
  • Remove reference_cast in make_boxed_from_unboxed_functor (build time) (#51319)
  • Debug-gate static_assert in KernelFunction::makeFromUnboxedFunctor (build time) (#51367)
  • Use real if constexpr behind macro in hot template (build time) (#51368, #52420)
  • Outline DispatchStub::get_call_ptr() (#51908)
  • Use torchCheckFail in TORCH_INTERNAL_ASSERT (#52086)
  • Add Storage::set_data_ptr_noswap and use where possible (#52244)
  • Make shared empty string static instead of thread_local (#52220)
  • Avoid std::string in TORCH_CHECK when possible (#52221)
  • Make c10::str(const char*) return const char* (#52222)
  • Sync TORCH_INTERNAL_ASSERT optimizations with TORCH_CHECK (#52226)
  • Save a single add instruction in the dispatcher (#52543)
  • Inline TensorIteratorConfig setters (#52661)
  • Use DimVector for sizes and strides in view (#53001)
  • Avoid TLS in has_names (#53003)
  • Don't inline Dispatcher::call on mobile (binary size) (#53197)
  • Skip dispatch for is_floating_point (#53242)
  • Move non-template part of TensorImpl::Resize to cpp (binary size, build time) (#53388)
  • Don't copy vector arguments to Tensor::Resize (#53389)
  • Skip dispatch trip for CPU in resize_ (#53575)
  • Pass Scalar by reference (#53583)
  • Don't use static for template declarations in headers (binary size) (#53602)
  • Boxing logic forwards arguments to stack (#53624)
  • Speed up Tensor::data_ptr by using static item size (#53723)
  • Skip dispatch for is_signed (#53847)
  • Allow inlining of more Tensor methods (#53905)
  • Tensor::register_hook: Avoid wrapping hook in two levels of std::function (#53917)
  • Take advantage of string literals in TORCH_WARN (#54032)
  • Inline Tensor keyset-checking methods & similar getters (#54806)
  • TensorIterator::output returns const reference (#54811)
  • Avoid refcount bump in TensorArg (#54934)
  • Move Tensor::has_names inline (#54965)
  • OperandInfo ctor should take rvalue reference (#54972)
  • Don't bother with SmallVector in TensorMaker (#55125)
  • Eliminate device guard in generic dispatch key kernel wrappers (#55131)
  • Move logic to skip a redispatch directly inside of resize_output (#55162)
  • Use infer_size_dimvector in ExpandUtils (#55180)
  • Don't create intermediate Tensor for at::result_type w/Scalar (#55232)
  • Use sizes()[x] instead of size(x) in addr (#55247)
  • Add & use inferExpandGeometry_dimvector (#55316)
  • Mark borrowed case as C10_LIKELY in MaybeOwned (#55553)
  • Avoid double indirection in MaybeOwned's borrowed state (#55685)
  • Make VariableVersion::DISABLED the default constructor for VariableVersion. (#55572)
  • Don't set version_counter on inference tensor for unsafe_ ops. (#55819)
  • Add & document borrow_from_optional_tensor (#56647)
  • Migrate hacky wrapper removal to borrow_from_optional_tensor (#56648)
  • Optimize at::repeat (#56994)
  • Optimize intrusive_ptr(TTarget*) ctor (pybind) (#57053)

torch.fx

• Use precompiled regex in graph name processing (#52853).
• Optimize module path finding in Tracer (#52990).
• Speed up _Namespace.create_name (#55580).

Profiler

• Sped up post processing (#58021).

TorchScript

• Generate arithmetic vs logical right shift as appropriate (#51749)
• Introduced likely/unlikely CompareSelect hint (#51751).
• Implemented log approximation using the VML approach (#51752).
• Updated TensorExpr to use LLVM as the default backend (#52314).
• Added support for aten::hardtanh (a hot operation in mobilenet v2/v3) (#52394)
• Implemented hardtanh (#57750).
• Add aten::batch_norm into fuser when in inference mode (#54204).
• NNC
  • Added a new API to perform loop fusion (#54461).
  • Implemented depthwise conv2d (#54920).
  • Integrated NNC conv2d with fuser (#55213).
  • Added logic to use NNC to generate logit, relu and tanh (#52322).
  • Use VML-inspired logarithm with NNC, tweak scheduling (#52423).
  • Generate sigmoid with NNC (#52424).
  • Enabled CPU fusion only when num_threads == 1 (#56120).
  • Use NNC's call_raw API to reduce call overheads. (#57553).
  • Started codegen’ing some external calls (#58118).
• Reduce memory use for inference path in OneDNN MaxPooling (#52728).
• Removed redundant gather_ranges when fusing (#53323).
• Optimized sigrid_hash (#53065).
• Updated create_empty_from to directly use the native version of at::empty (#53216).
• Added a minimum fusion group size (#50217).
• Added CUDNN Conv-Add-Relu fusion for Frozen Model Optimization (#52102).
• Avoid dispatch overhead in call to MKLDNN convolution (#52614).
• Added re-inplacing to MKLDNN subgraphs (#53908).
• Set requires_gradient to help autodiff prune unneeded gradients (#54374).
• Use type cache in erasing shape information (#55828).
• Added heuristic to avoid perf incompatible MKLDNN formats for binary ops (#56089)
• Added adaptive_avgpool2d to the set of fusible ops (#56180).
• Lazily initialize AliasDb in remove_mutation opt (#55949)
• Made DataPtr extraction in CUDAFuture faster for Python values (#56918).
• Lazily initialize AliasDb in DCE (#56649).
• Add explicit checks for in-place ops in ReplaceWithCopy (#54657).

Quantization

• Optimized quantized torch.cat (#54813).

Mobile

• Enabled QNNPACK for Apple Silicon builds (#52308).
• Sped up model loading for per-channel quantized models using QNNPACK (#53726).
• Added XNNPACK implementations for various operationss (hardswish, global average pool) (#56714, #56715, #55791).
• Made various performance improvements for iOS GPU (Metal) (#57664, #57665, #57666, #57667, #57668).

Distributed

torch.distributed

• Avoid 2 extra copies when reducing sparse tensors (#57822)

Vulkan

• Switched to a more performant implementation of matrix multiplication (#49609).
• Updated the version of Vulkan Memory Allocator used (#52938).
• Increased the command buffer submission rate (#57196).
• Updated the Vulkan tensors to use 2D textures whenever possible, instead of always using 3D textures (#57198).
• Updated convolution shaders to receive the bias tensor as a texture as opposed to a buffer (#57201).

Docs

Python API

• Added torch.testing docs (#57247).
• Updated docs to mention CUDA support for Future (#50048).
• Included memory_format , an already accepted argument, in torch.empty doc (#54664).
• Improved the documentation for torch.matrix_exp() (#55626).
• Updated use_deterministic_algorithms docs (#55413).
• Added the generator argument to torch.rand and torch.randn docs (#56242).
• Added an example to show how to use learning rate schedulers in Optimizers (#56705).
• Corrected the torch.ceil formula in docs (#55039)
• Fixed docs to use autosummary on tensors.rst (#55042)
• Improved testing documentation in CONTRIBUTING.md (#54904)
• Updated torch.fft docs to include out= argument (#56732).
• Updated rounding_mode documentation to remove "true" (#52202).
• Added a note about error handling for non-chained futures (#53212).
• Updated torch.stft documentation to clarify output shape (#54877).
• Added an example for torch.is_tensor and torch.is_storage (#55052).

Autograd

• Added a note describing gradcheck internals (#55966).
• Split up autograd documentation into separate pages (#55672).
• torch.utils.checkpoint : Updated docs to state that input flag in .backward() is disallowed when checkpointing (#51746).
• Added section in autograd mechanics note describing how to use inference/no_grad (#58513).
• Added doc string for torch.is_inference_mode_enabled and torch.is_grad_enabled (#59047).
• Added no-grad inference mode note (#58513).
• Add docstring for is_inference_mode_enabled (#59047).

torch.nn

• nn.TripletMarginLoss / torch.reciprocal: Fix formatting in docs (#51650)
• nn.FractionalMaxPool3d: Add to pooling layer docs (#52556)
• F.fractional_max_pool: Add to nn.functional docs (#52557)
• Module.share_memory: Add link to Tensor.share_memory_ in docs (#52561)
• nn.SiLU: Mention alternative name of Swish within docs (#53239)
• Remove redundant hardsigmoid() in docstring to show up inplace parameter (#52559)
• Clarify docs for lazy modules (#53495)
• torch.nn: Grammatically update docs (#54370)
• nn.Sequential: Expand docs, including comparison with nn.ModuleList (#53380)
• F.embedding_bag: Fix formatting in docs (#54666)
• F.group_norm: Add to docs (#54673)
• Add separate autosummary for flatten layer docs (#54663)
• LazyModuleMixin: Add missing attr in docs to improve formatting (#53363)
• conv1d: Fix example error in docs (#57356)
• nn.functional: Split docs into a table-of-contents page and a sub-page per function (#55038)
• nn.LSTM / nn.RNN / nn.GRU: Clarify batch_first behavior (#58809)
• nn.CosineEmbeddingLoss: Add shape info to docs (#58403)
• Add doc warnings for default SELU gain (#54057).
• Clarify batch_first behavior for nn.LSTM, nn.RNN, and nn.GRU (#58809).
• Add UninitializedBuffer to nn docs ( #59021).
• Document factory_kwargs in nn.Quantize + remove Attributes section (#59025).

Dataloader

• Added DataPipes Typing Doc (#54773).
• Added docs to document the default NumPy seed for DataLoader workers (#56528).

AMD

• Added HIP semantics doc (#57871).

CUDA

• Added scatter_add to amp docs (#54908)
• Added reset_peak_memory_stats in cuda.rst (#54668).

torch.fx

• Make some modifications to limitation section (#51928)
• Added docstring for concrete_args on Tracer.trace (#53151).
• Change Dynamic Control Flow example to a more dynamic version (#53250).
• Render inherited methods in fx.Tracer API reference (#53630).
• Add docs for ShapeProp (#54554).
• Hide module paths leaking in the documentation. (#54585).

Profiler

• Updated profiler recipe doc (https://github.com/pytorch/tutorials/pull/1528).

TorchScript

• Added NNC IR specification (#52912).
• Added starter content for new TorchScript language reference (#53837).
• Added documentation for torch.jit.Attribute and torch.jit.annotate (#54485).
• Updated TorchScript language reference section for types (#53673).
• Documented the TorchScript type system (#53244).
• Added language reference for Python builtin functions, statements, and values in TorchScript (#52847, #52830).
• Added torch.* API section for TorchScript language reference (#53236).
• Added “Conditionals in TE” doc (#56949).

torch.package

• Added API reference (#55812, #56547).
• Add explanation, tutorial, and preamble sections for torch.package (#59833, #59503, #59499, #59491, #59842, #59843, #59602).
• Add pickle security warning to package docs (#59959).

Quantization

• Added docs for storage and tensors for quantized Tensor (#51817).
• Fixed FX Graph Mode Quantization tutorial link (#54715).
• Added fx graph mode quant api doc (#55306).
• FX Graph Mode Quantization - fixed preamble (#52192).
• Fixed broken link to fx graph quant guide in quantization.rst (#56776).

Mobile

• Added doc string for lite interpreter related API in Android (#53136).
• Improved export_opnames Documentation (#52333).

Distributed

torch.distributed.Store

• Documentation for TCPStore’s compare_set API (#57203)

torch.distributed.optim

• Update distributed optimizer documentation (#58084)
• Update and expose ZeroRedundancyOptimizer docs (#53112, #53113)

torch.distributed.elastic

• Upstream torchelastic documentation to PyTorch. (#56811)
• Revise the note section of RendezvousHandler doc (#57723)
• Update the rendezvous documentation (#57973)

DistributedDataParallel

• Add register_comm_hook API to DDP communication hooks documentation page (#51846,#51986)
• Enhance documentation around DistributedDataParallel uneven input support (#57448)
• Enhance communication hook documentation (#58170, #58168, #53253, #53855, #53596,#53955, #54052. #55031)

torch.distributed.rpc

• Add a disclaimer about limited CUDA support in RPC (#58023)
• torch.distributed.rpc: Add a link to the tutorial in RemoteModule docstring (#57875)
• torch.distributed.rpc: Mentioned RemoteModule in RPC documentation (#57876)

torch.distributed.nn.RemoteModule

• Add RemoteModule to master RPC docs. (#53084)
• Add remote_parameters and get_module_rref to RemoteModule docs. (#54645)

torch.distributed.pipeline

• Enhance Pipe docs to explicitly mention RPC initialization. (#55187)
• Add tutorials to pipeline docs. (#55209)

torch.distributed

• Update documentation for get_future support (#58107)
• Mention distributed profiling in documentation (#58286)
• Update distributed doc table for alltoall (#54277)
• fix docstring signature in all_reduce_multigpu (#54665)
• torch.distributed: Improve dist.new_group doc (#55660)

ONNX

• Updated ONNX documentation (#51362) (#53313).
• Updated scripting docs (#54634) (#54868).
• Fixed docstring signature of torch.{onnx,utils} (#54662).
• onnx.symbolic_helper.parse_args: document and clean up (#56956) (#57598).