5.9. PopART

3.3.0

Added support for the largest=false option in the TopK operation.
Added the NormalizeImage op that normalises the data and pads to four channels on-device after the data has been transferred to the IPU. This can enable better performance for subsequent convolution operations.
Added the stashAllTensorsInferencePipeline option to the SessionOptions class to enable all tensors to be stashed when doing inference. This may improve performance for certain use cases.
Added the ability to fine-tune the auto virtual graph result with the virtualGraphSplitRatios option in the SessionOptions class.
Added the SplineBasis and SplineWeighting ops to support the PyTorch Geometric SplineConv operator.
Switched use of the deprecated deviceIteration to deviceIterations.

Fixed the Loop and Scan ops so that any constant tensors are implicitly added into the subgraphs of these ops as inputs.
Fixed the overflow in the Clip operator.

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Added the environment variable POPART_PRELOAD_POPEF. When this is set to “full-preload” it will cause a full sequential read of a PopEF file from the filesystem, enabling subsequent operations to be carried out on a cached file. This environment variable makes it viable to store PopEF files on S3 and have them loaded on demand when there is a cache hit.

Removed dependency on snap library. The related popart::PopOpx class has been removed. See Compatibility changes for more information.
Add support for scatter reduction mul operation.

Modify the PopART implementation of scatterreduce to match the PyTorch scatter_reduce implementation on the CPU.

Add support for grouped gather operations.
Add support for grouped scatterreduce operations.
Use multiUpdate instead of scatter in topk gradient implementation (improves performance for torch.max).
To save memory, prevent weight duplication for inference. The weight tensor can be treated as a constant for inference.
Add useLoopCandidateCreator for weights shared by loop operators and non-loop operators, in order to optimize the layout.

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The popart::PopOpx class has been removed. Please change your custom ops to inherit from popart::Opx instead.