Support Empty Input Tensors and > 5 Cat Inputs #7855
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7855
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Summary: PyTorch's cat.default operator can take in arbitrarily large number of inputs. This is because the input is a Tensor List. XNNPACK however supports largest of 5 input tensors at a time. It is common for > 5 input tensors to be concatenated together, so we should still support cat's with this operation. We can do so by adding a pass which decomposes the Cat operator. The first 5 operators can be concatenated together, and then we recursively inject more concatenate nodes to concatenate the result of the last operation with the next 4 input tensors. Another common design pattern is for Concatenates to start with an empty tensor and then concatenat tensors together into it. This results in some empty tensors as inputs to concatenate. Previously we don't partition inputs with empty tensors. I don't remember what the case was with empty tensors, but it seems to work now, so disabling that partitioner check for now. Perhaps CI will pick up an error if this is indeed erroronous Reviewed By: digantdesai Differential Revision: D68523312
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Summary: PyTorch's cat.default operator can take in arbitrarily large number of inputs. This is because the input is a Tensor List. XNNPACK however supports largest of 5 input tensors at a time. It is common for > 5 input tensors to be concatenated together, so we should still support cat's with this operation. We can do so by adding a pass which decomposes the Cat operator. The first 5 operators can be concatenated together, and then we recursively inject more concatenate nodes to concatenate the result of the last operation with the next 4 input tensors. Another common design pattern is for Concatenates to start with an empty tensor and then concatenat tensors together into it. This results in some empty tensors as inputs to concatenate. Previously we don't partition inputs with empty tensors. I don't remember what the case was with empty tensors, but it seems to work now, so disabling that partitioner check for now. Perhaps CI will pick up an error if this is indeed erroronous Reviewed By: digantdesai Differential Revision: D68523312
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Summary:
PyTorch's cat.default operator can take in arbitrarily large number of inputs. This is because the input is a Tensor List. XNNPACK however supports largest of 5 input tensors at a time. It is common for > 5 input tensors to be concatenated together, so we should still support cat's with this operation. We can do so by adding a pass which decomposes the Cat operator. The first 5 operators can be concatenated together, and then we recursively inject more concatenate nodes to concatenate the result of the last operation with the next 4 input tensors.
Another common design pattern is for Concatenates to start with an empty tensor and then concatenat tensors together into it. This results in some empty tensors as inputs to concatenate.
Previously we don't partition inputs with empty tensors. I don't remember what the case was with empty tensors, but it seems to work now, so disabling that partitioner check for now. Perhaps CI will pick up an error if this is indeed erroronous
Differential Revision: D68523312