Added

• monai.bundle primary module with a ConfigParser and command-line interfaces for config-based workflows
• Initial release of MONAI bundle specification
• Initial release of volumetric image detection modules including bounding boxes handling, RetinaNet-based architectures
• API preview monai.data.MetaTensor
• Unified monai.data.image_writer to support flexible IO backends including an ITK writer
• Various new network blocks and architectures including SwinUNETR
• DeepEdit interactive training/validation workflow
• NuClick interactive segmentation transforms
• Patch-based readers and datasets for whole-slide imaging
• New losses and metrics including SurfaceDiceMetric, GeneralizedDiceFocalLoss
• New pre-processing transforms including RandIntensityRemap, SpatialResample
• Multi-output and slice-based inference for SlidingWindowInferer
• NrrdReader for NRRD file support
• Torchscript utilities to save models with meta information
• Gradient-based visualization module SmoothGrad
• Automatic regular source code scanning for common vulnerabilities and coding errors

Changed

• Simplified TestTimeAugmentation using de-collate and invertible transforms APIs
• Refactoring monai.apps.pathology modules into monai.handlers and monai.transforms
• Flexible activation and normalization layers for TopologySearch and DiNTS
• Anisotropic first layers for 3D resnet
• Flexible ordering of activation, normalization in UNet
• Enhanced performance of connected-components analysis using Cupy
• INSTANCE_NVFUSER for enhanced performance in 3D instance norm
• Support of string representation of dtype in convert_data_type
• Added new options iteration_log, iteration_log to the logging handlers
• Base Docker image upgraded to nvcr.io/nvidia/pytorch:22.04-py3 from nvcr.io/nvidia/pytorch:21.10-py3
• collate_fn generates more data-related debugging info with dev_collate

Fixed

• Unified the spellings of "meta data", "metadata", "meta-data" to "metadata"
• Various inaccurate error messages when input data are in invalid shapes
• Issue of computing symmetric distances in compute_average_surface_distance
• Unnecessary layer self.conv3 in UnetResBlock
• Issue of torchscript compatibility for ViT and self-attention blocks
• Issue of hidden layers in UNETR
• allow_smaller in spatial cropping transforms
• Antialiasing in Resize
• Issue of bending energy loss value at different resolutions
• kwargs_read_csv in CSVDataset
• In-place modification in Metric reduction
• wrap_array for ensure_tuple
• Contribution guide for introducing new third-party dependencies

Removed

• Deprecated nifti_writer, png_writer in favor of monai.data.image_writer
• Support for PyTorch 1.6