Enabling bias_dropout_add_fused with no bias term

[ashvinnihalani]

What does this PR do ?

Specific LLM/VLM hang when using specific PP settings and with the bias term is set to false hang. By enabling a fused dropout_add_fused we should fix this problem as well as speed up training of LLM/VLM that do not have the bias term

Collection: nlp

Changelog

• Add specific line by line info of high level changes in this PR.
• nemo/collections/nlp/modules/common/megatron/transformer.py - Enabling the bias_dropout_add_fusion to be used for both bias and non bias enabled
• nemo/collections/nlp/modules/common/megatron/fused_bias_dropout_add.py - Check whether the bias term is there and choose relevant fused function

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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Additional Information

• Related to GPT Training process hangs during sanity checking dataloader with TP=2, PP=2 and bias=false #6396

[shixianc]

Should we also update bias_dropout_add_fused_inference_ to check if bias exists? otherwise it seems the type would mismatch when doing x + bias

[paul-gibbons]

@yaoyu-33

[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[github-actions]

This PR was closed because it has been inactive for 7 days since being marked as stale.