[Torch] Avoid adding unnecessary slicing #7479
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ping @kevinthesun @anijain2305 @siju-samuel this should be easy and no brainer |
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Lokiiiiii
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Mar 2, 2021
* simplyfing * improved fast path for slice * update rewrite pattern for maskrcnn
trevor-m
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Mar 2, 2021
* simplyfing * improved fast path for slice * update rewrite pattern for maskrcnn
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PyTorch object detection models have many uses of slicing like
arr[:, None]which is essentially nop, see for example https://github.com/pytorch/vision/blob/f7fae490980885e426fef01bb214025b9eddb832/torchvision/models/detection/roi_heads.py#L80The current
aten::sliceconverter does not detect such nop slicing and inserts unnecessarystrided_slice. The worst of all, many ofarr[:, None]converts to dynamic strided slice, which results in too muchany_dim.I simplified
aten::sliceconversion and fixed the fast path detection. I've updated MaskRCNN rewrite pattern to remove one ofdyn.strided_slice, which serves as a test case.please review @kevinthesun @anijain2305 @siju-samuel