Note: our conda install commands have slightly changed. Version specifiers such as cuda100 in conda install pytorch cuda100 -c pytorch have changed to conda install pytorch cudatoolkit=10.0 -c pytorch

Breaking Changes

There are no breaking changes in this release.

Bug Fixes

Serious

• Higher order gradients for CPU Convolutions have been fixed (regressed in 1.0.0 under MKL-DNN setting) #15686
• Correct gradients for non-contiguous weights in CPU Convolutions #16301
• Fix ReLU on CPU Integer Tensors by fixing vec256 inversions #15634
• Fix bincount for non-contiguous Tensors #15109
• Fix torch.norm on CPU for large Tensors #15602
• Fix eq_ to do equality on GPU (was doing greater-equal due to a typo) (#15475)
• Workaround a CuDNN bug that gave wrong results in certain strided convolution gradient setups
  • blacklist fft algorithms for strided dgrad (#16626)

Correctness

• Fix cuda native loss_ctc for varying input length (#15798)
  • this avoids NaNs in variable length settings
• C++ Frontend: Fix serialization (#15033)
  • Fixes a bug where (de-)/serializing a hierarchy of submodules where one submodule doesn't have any parameters, but its submodules do
• Fix derivative for mvlgamma (#15049)
• Fix numerical stability in log_prob for Gumbel distribution (#15878)
• multinomial: fix detection and drawing of zero probability events (#16075)

Crashes

• PyTorch binaries were crashing on AWS Lambda and a few other niche systems, stemming from CPUInfo handling certain warnings as errors. Updated CPUInfo with relevant fixes.
• MKL-DNN is now statically built, to avoid conflicts with system versions
• Allow ReadyQueue to handle empty tasks (#15791)
  • Fixes a segfault with a DataParallel + Checkpoint neural network setting
• Avoid integer divide by zero error in index_put_ (#14984)
• Fix for model inference crash on Win10 (#15919) (#16092)
• Use CUDAGuard when serializing Tensors:
  • Before this change, torch.save and torch.load would initialize the CUDA context on GPU 0 if it hadn't been initialized already, even if the serialized tensors are only on GPU 1.
• Fix error with handling scalars and rpow, for example 1 ^^ x, where x is a PyTorch scalar (#16687)
• Switch to CUDA implementation instead of CuDNN if batch size >= 65536 for affine_grid (#16403)
  • CuDNN crashes when batch size >= 65536
• [Distributed] TCP init method race condition fix (#15684)
• [Distributed] Fix a memory leak in Gloo's CPU backend
• [C++ Frontend] Fix LBFGS issue around using inplace ops (#16167)
• [Hub] Fix github branch prefix v (#15552)
• [Hub] url download bugfix for URLs served without Content-Length header

Performance

• LibTorch binaries now ship with CuDNN enabled. Without this change, many folks saw significant perf differences while using LibTorch vs PyTorch, this should be fixed now. #14976
• Make btriunpack work for high dimensional batches and faster than before (#15286)
• improve performance of unique with inverse indices (#16145)
• Re-enable OpenMP in binaries (got disabled because of a CMake refactor)

Other

• create type hint stub files for module torch (#16089)
  • This will restore auto-complete functionality in PyCharm, VSCode etc.
• Fix sum_to behavior with zero dimensions (#15796)
• Match NumPy by considering NaNs to be larger than any number when sorting (#15886)
• Fixes various error message / settings in dynamic weight GRU / LSTMs (#15766)
• C++ Frontend: Make call operator on module holder call forward (#15831)
• C++ Frontend: Add the normalize transform to the core library (#15891)
• Fix bug in torch::load and unpack torch::optim::detail namespace (#15926)
• Implements Batched upper triangular, lower triangular (#15257)
• Add torch.roll to documentation (#14880)
• (better errors) Add backend checks for batch norm (#15955)

JIT

• Add better support for bools in the graph fuser (#15057)
• Allow tracing with fork/wait (#15184)
• improve script/no script save error (#15321)
• Add self to Python printer reserved words (#15318)
• Better error when torch.load-ing a JIT model (#15578)
• fix select after chunk op (#15672)
• Add script standard library documentation + cleanup (#14912)