Don't truncate leading 1s if they are unbacked #95141
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If it's just right, broadcasting will do the right thing automatically. This helps with unbacked SymInts as I can avoid testing one equality on the inside. Signed-off-by: Edward Z. Yang <ezyangmeta.com> [ghstack-poisoned]
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If it's just right, broadcasting will do the right thing automatically. This helps with unbacked SymInts as I can avoid testing one equality on the inside. Signed-off-by: Edward Z. Yang <ezyangmeta.com> ghstack-source-id: 905f6454a7897951ba156367c53ab515e71faf19 Pull Request resolved: #95141
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If it's just right, broadcasting will do the right thing automatically. This helps with unbacked SymInts as I can avoid testing one equality on the inside. The previous attempt at #94521 I got the logic a bit wrong. I need to compute the difference between the data to be set, and the post-slice space for the values. But I incorrectly compared against the *pre-slice* space in the original PR. Another version of this PR which is wrong is to compare against variableIndices.size(); but remember that in advanced indexing with tensors/lists, each of the individual indices specify what coordinates to read out of each dimension; so to get the post-slice space you have to look at the dim of the advanced index itself! There is now a test for this. Signed-off-by: Edward Z. Yang <ezyangmeta.com> [ghstack-poisoned]
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If it's just right, broadcasting will do the right thing automatically. This helps with unbacked SymInts as I can avoid testing one equality on the inside. Signed-off-by: Edward Z. Yang <ezyangmeta.com> ghstack-source-id: abc461993881c6398e318b3e0dd3b858a6d22e44 Pull Request resolved: #95141
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This prevents us from guarding on leading unbacked SymInts. The previous attempt at #94521 I got the logic a bit wrong. My idea there was to avoid slicing when the values to be set have low enough dimensionality that they definitely aren't too long. To do this, I need to compute the difference between the data to be set, and the post-slice space for the values. But I incorrectly compared against the *pre-slice* space in the original PR. Another version of this PR which is wrong is to compare against variableIndices.size(); but remember that in advanced indexing with tensors/lists, each of the individual indices specify what coordinates to read out of each dimension! A third incorrect attempt tested `variableIndices[0].dim()`, which is only correct if you don't broadcast one of the later variable indices, and if there are enough variableIndices to cover all dims. This is all quite complicated, so I went for a simpler solution of checking if the leading dim had a hint before testing if it is not equal to one. BTW, there is no test for this one stripping behavior. There is now a test for this, based off the real code that caused the problem. Signed-off-by: Edward Z. Yang <ezyangmeta.com> [ghstack-poisoned]
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This reverts commit 77dae43.
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This prevents us from guarding on leading unbacked SymInts. The previous attempt at pytorch#94521 I got the logic a bit wrong. My idea there was to avoid slicing when the values to be set have low enough dimensionality that they definitely aren't too long. To do this, I need to compute the difference between the data to be set, and the post-slice space for the values. But I incorrectly compared against the *pre-slice* space in the original PR. Another version of this PR which is wrong is to compare against variableIndices.size(); but remember that in advanced indexing with tensors/lists, each of the individual indices specify what coordinates to read out of each dimension! A third incorrect attempt tested `variableIndices[0].dim()`, which is only correct if you don't broadcast one of the later variable indices, and if there are enough variableIndices to cover all dims. This is all quite complicated, so I went for a simpler solution of checking if the leading dim had a hint before testing if it is not equal to one. BTW, there is no test for this one stripping behavior. There is now a test for this, based off the real code that caused the problem. Signed-off-by: Edward Z. Yang <ezyangmeta.com> Pull Request resolved: pytorch#95141 Approved by: https://github.com/ngimel
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Stack from ghstack (oldest at bottom):
This prevents us from guarding on leading unbacked SymInts.
The previous attempt at #94521 I got the logic a bit wrong. My idea there was to avoid slicing when the values to be set have low enough dimensionality that they definitely aren't too long. To do this, I need to compute the difference between the data to be set, and the post-slice space for the values. But I incorrectly compared against the pre-slice space in the original PR. Another version of this PR which is wrong is to compare against variableIndices.size(); but remember that in advanced indexing with tensors/lists, each of the individual indices specify what coordinates to read out of each dimension! A third incorrect attempt tested
variableIndices[0].dim(), which is only correct if you don't broadcast one of the later variable indices, and if there are enough variableIndices to cover all dims. This is all quite complicated, so I went for a simpler solution of checking if the leading dim had a hint before testing if it is not equal to one.BTW, there is no test for this one stripping behavior. There is now a test for this, based off the real code that caused the problem.
Signed-off-by: Edward Z. Yang <ezyangmeta.com>