Adds a Knob for OnlineSampling by introducing 'global_sample_mapping' in the SFT config.yaml

[conver334]

What does this PR do ?

Adds a Knob for OnlineSampling by introducing a new parameter 'global_sample_mapping' in the SFT config YAML(default value is false).
The feature was proposed in this Nvbug. This will allow users to choose the data sample method that best suits their needs.

Collection: NeMo's NLP collection

Changelog

• SFT config.yaml
• Passing parameters
• Control whether to use OnlineSampleMapping

Usage

change 'global_sample_mapping' in megatron_gpt_finetuning_config.yaml
False (default): Use OnlineSampleMapping. Shuffle the dataset within each epoch.
True: Shuffle the replicated data all together.

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• New Feature
• Bugfix
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@ericharper
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Additional Information

• Related to nvbug
  The second suggested Improvement has not been fixed yet