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* split wgrad for GroupedLinear
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

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Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* support wgrad split for linear and ln_linear
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* add comments and fix WeightGradStore
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* support bias and fix unit tests
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* minor fix
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* support fuse_grad_accumulation=false
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* add wgrad split for layernorm_mlp
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* minor fix
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fix unittest
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* add unittest for distributed interface apply Dener's suggestion
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

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* minor fix
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* replace split_bw with delay_wgrad_compute
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update transformer_engine/pytorch/module/layernorm_mlp.py
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

* Update transformer_engine/pytorch/module/linear.py
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

* Update transformer_engine/pytorch/module/layernorm_linear.py
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

* remove comments
Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>

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Signed-off-by: Hongbin Liu <hongbinl@nvidia.com>
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>
Co-authored-by: Hongbin Liu <hongbinl@nvidia.com>
Co-authored-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>