pytorch

eebc0774 - [ONNX] add support for prim::Unitialized in lower_tuples pass (#56912)

[ONNX] add support for prim::Unitialized in lower_tuples pass (#56912) Summary: Fixes https://github.com/pytorch/pytorch/issues/56911 Code from issue generates this Torchscript: ``` graph(%self : __torch__.MyModule, %t.1 : Tensor): %12 : None = prim::Constant() %7 : str = prim::Constant[value="Negative input"]() # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:11:28 %3 : int = prim::Constant[value=0]() # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:10:15 %9 : int = prim::Constant[value=5]() # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:13:31 %33 : (Tensor, Tensor) = prim::Uninitialized() %4 : Tensor = aten::lt(%t.1, %3) # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:10:11 %6 : bool = aten::Bool(%4) # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:10:11 %34 : (Tensor, Tensor) = prim::If(%6) # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:10:8 block0(): = prim::RaiseException(%7) # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:11:12 -> (%33) block1(): %11 : int[] = prim::ListConstruct(%9) %16 : Tensor = aten::zeros(%11, %12, %12, %12, %12) # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:13:19 %18 : int[] = prim::ListConstruct(%9) %23 : Tensor = aten::zeros(%18, %12, %12, %12, %12) # /mnt/nvdl/usr/msladek/notes/python_code/unitialized.py:13:35 %24 : (Tensor, Tensor) = prim::TupleConstruct(%16, %23) -> (%24) return (%34) ``` Problem is that onnx exporter during lower_tuples pass doesn't support forwarding of tuples in prim::Unitialized. Solution is: 1. add prim::Unitialized to supported_op in lower_tuples pass 1. As prim::Unitialized has now multiple outputs, we should call giveFreshAlias for every output Pull Request resolved: https://github.com/pytorch/pytorch/pull/56912 Reviewed By: nikithamalgifb Differential Revision: D29837200 Pulled By: SplitInfinity fbshipit-source-id: 321fae6fe52b1523df5653dbb9ea73b998ef1cda