Add FlexShard RaggedShard example#3402
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Summary: - implement a RaggedShard placement with ragged bucket unshard and grad reduction - export RaggedShard placement helpers and add focused coverage - keep local planning docs out of the committed change Test Plan: - python -m pytest -q torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run --all-files (fails: local Pyrefly config cannot find torch search path; lychee reports unrelated external link failures) ghstack-source-id: 5d1d9c3 Pull-Request: #3402
weifengpy
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Summary: - implement a RaggedShard placement with ragged bucket unshard and grad reduction - export RaggedShard placement helpers and add focused coverage - keep local planning docs out of the committed change Test Plan: - python -m pytest -q torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run --all-files (fails: local Pyrefly config cannot find torch search path; lychee reports unrelated external link failures) ghstack-source-id: b2554bb Pull-Request: #3402
weifengpy
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May 19, 2026
Summary: - implement a RaggedShard placement with ragged bucket unshard and grad reduction - export RaggedShard placement helpers and add focused coverage - add 2-rank CUDA runtime coverage and mixed RaggedShard bucket validation - keep local planning docs and repro scripts out of the committed change Test Plan: - python -m pytest -q torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - python -m ruff check torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run ufmt --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run flake8 --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run pydoclint --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run codespell --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run --all-files (fails: local Pyrefly config cannot find torch search path; lychee reports unrelated external link failures) ghstack-source-id: 1cfa793 Pull-Request: #3402
weifengpy
added a commit
that referenced
this pull request
May 19, 2026
Summary: - implement a RaggedShard placement with ragged bucket unshard and grad reduction - export RaggedShard placement helpers and add focused coverage - add 2-rank CUDA runtime coverage and mixed RaggedShard bucket validation - keep local planning docs and repro scripts out of the committed change Test Plan: - python -m pytest -q torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - python -m ruff check torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run ufmt --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run flake8 --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run pydoclint --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run codespell --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run --all-files (fails: local Pyrefly config cannot find torch search path; lychee reports unrelated external link failures) ghstack-source-id: 1cfa793 Pull-Request: #3402
weifengpy
added a commit
that referenced
this pull request
May 19, 2026
Summary: - implement a RaggedShard placement with ragged bucket unshard and grad reduction - export RaggedShard placement helpers and add focused coverage - add 2-rank CUDA runtime coverage and mixed RaggedShard bucket validation - keep local planning docs and repro scripts out of the committed change Test Plan: - python -m pytest -q torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - python -m ruff check torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run ufmt --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run flake8 --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run pydoclint --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run codespell --files torchtitan/experiments/flex_shard/tests/test_flex_shard_ragged_shard.py - pre-commit run --all-files (fails: local Pyrefly config cannot find torch search path; lychee reports unrelated external link failures) ghstack-source-id: 1cfa793 Pull-Request: #3402
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