enable to_mxfp8 cast for DTensor#2420
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2420
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vkuzo
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Summary: 1. add a test for casting a DTensor to mxfp8 2. make the test pass: a. remove addition of epsilon, it's not supported in DTensor world but we also don't need it anymore since we are no longer using `log2` anywhere. b. replace `<<` with `torch.bitwise_left_shift` and `>>` with `torch.bitwise_right_shift`. The short versions are silently broken for DTensor inputs, but the verbose versions work. 3. set up the wiring for testing mxfp8 with TP on a toy model. Note that making this work is split for the next PR, as this PR got too large. Test Plan: ```bash ./test/prototype/mx_formats/test_dtensor.sh ./test/float8/test_dtensor.sh pytest test/prototype/mx_formats/ ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 756da75 ghstack-comment-id: 2993264092 Pull Request resolved: #2420
vkuzo
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Summary: 1. add a test for casting a DTensor to mxfp8 2. make the test pass: a. remove addition of epsilon, it's not supported in DTensor world but we also don't need it anymore since we are no longer using `log2` anywhere. b. replace `<<` with `torch.bitwise_left_shift` and `>>` with `torch.bitwise_right_shift`. The short versions are silently broken for DTensor inputs, but the verbose versions work. 3. set up the wiring for testing mxfp8 with TP on a toy model. Note that making this work is split for the next PR, as this PR got too large. Test Plan: ```bash ./test/prototype/mx_formats/test_dtensor.sh ./test/float8/test_dtensor.sh pytest test/prototype/mx_formats/ ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: e054ed4 ghstack-comment-id: 2993264092 Pull Request resolved: #2420
vkuzo
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Summary: 1. add a test for casting a DTensor to mxfp8 2. make the test pass: a. remove addition of epsilon, it's not supported in DTensor world but we also don't need it anymore since we are no longer using `log2` anywhere. b. replace `<<` with `torch.bitwise_left_shift` and `>>` with `torch.bitwise_right_shift`. The short versions are silently broken for DTensor inputs, but the verbose versions work. 3. set up the wiring for testing mxfp8 with TP on a toy model. Note that making this work is split for the next PR, as this PR got too large. Test Plan: ```bash ./test/prototype/mx_formats/test_dtensor.sh ./test/float8/test_dtensor.sh pytest test/prototype/mx_formats/ ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: d82a83f ghstack-comment-id: 2993264092 Pull Request resolved: #2420
vkuzo
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Jun 21, 2025
Summary: 1. add a test for casting a DTensor to mxfp8 2. make the test pass: a. remove addition of epsilon, it's not supported in DTensor world but we also don't need it anymore since we are no longer using `log2` anywhere. b. replace `<<` with `torch.bitwise_left_shift` and `>>` with `torch.bitwise_right_shift`. The short versions are silently broken for DTensor inputs, but the verbose versions work. 3. set up the wiring for testing mxfp8 with TP on a toy model. Note that making this work is split for the next PR, as this PR got too large. Test Plan: ```bash ./test/prototype/mx_formats/test_dtensor.sh ./test/float8/test_dtensor.sh pytest test/prototype/mx_formats/ ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: cd43d13 ghstack-comment-id: 2993264092 Pull Request resolved: #2420
danielvegamyhre
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Jun 24, 2025
liangel-02
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Aug 25, 2025
* Update [ghstack-poisoned] * Update [ghstack-poisoned] * Update [ghstack-poisoned] * Update [ghstack-poisoned] * Update [ghstack-poisoned] * Update [ghstack-poisoned] * Update [ghstack-poisoned] * Update [ghstack-poisoned]
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Summary:
a. remove addition of epsilon, it's not supported in DTensor world but
we also don't need it anymore since we are no longer using
log2anywhere.
b. replace
<<withtorch.bitwise_left_shiftand>>withtorch.bitwise_right_shift. The short versions are silently brokenfor DTensor inputs, but the verbose versions work. See
<<and>>operators seem silently broken for DTensor operand 1 and scalar operand 2 pytorch#156533.making this work is split for the next PR, as this PR got too large.
Test Plan:
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