[M-FSDP] Fix Tensor Parallel mode detection#3191
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shjwudp wants to merge 10 commits intoNVIDIA:mainfrom
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[M-FSDP] Fix Tensor Parallel mode detection#3191shjwudp wants to merge 10 commits intoNVIDIA:mainfrom
shjwudp wants to merge 10 commits intoNVIDIA:mainfrom
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/ok to test fcd18ff |
…on-LM into mfsdp_fix_mcore_tp_detect
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xuwchen
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Feb 25, 2026
BoxiangW
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jaredcasper
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Feb 28, 2026
…on-LM into mfsdp_fix_mcore_tp_detect
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What does this PR do ?
The TP (Tensor Parallel) mode detection for MCore model parameters in M-FSDP was incorrect in certain cases. This update fixes the issue by aligning the TP mode detection logic (Row, Column, Duplicate) with the Megatron-Bridge implementation.
Based on Megatron-Bridge, fix the detection of TP parallel modes, including Row, Column, and Duplicate.
Contribution process
flowchart LR A[Pre-checks] --> B[PR Tests] subgraph Code Review/Approval C1[Expert Review] --> C2[Final Review] end B --> C1 C2 --> D[Merge]Pre-checks
Core 0.8)Code review
The following process is enforced via the CODEOWNERS file for changes into
megatron/core. For changes outside ofmegatron/core, it is up to the PR author whether or not to tag the Final Reviewer team.For MRs into `main` branch
Feel free to message or comment the @mcore-oncall to help accelerate your merge into main. The less complex your PR is, the faster it will be approved and merged!
(Step 1): Add PR label
Expert Review(Step 2): Collect the expert reviewers reviews
Expert Reviewlabel when your PR is ready for review.Final Review might get declined if these requirements are not fulfilled.
(Step 3): Final Review
Final Reviewlabel(Optional Step 4): Cherry-pick into release branch
If this PR also needs to be merged into
core_r*release branches, after this PR has been merged, selectCherry-pickto open a new PR into the release branch.For MRs into `dev` branch
The proposed review process for `dev` branch is under active discussion.MRs are mergable after one approval by either
eharper@nvidia.comorzijiey@nvidia.com.Merging your PR
Any member of core-adlr and
core-nemowill be able to merge your PR.