Fix calculating num_available_samples
State: closed | Pull request: yes
Labels: name: NLP

name: Run CICD

# What does this PR do ?

Fix how we calculate the num_available_samples for the case of training more than one epoch on the line:
https://github.com/NVIDIA/NeMo/blob/7f3ac6b88289048643d445ec752a4d21547f2788/nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py#L129
 When interrupting the training job after one epoch and relaunching, `self.consumed_samples` will larger than `self.total_samples`, the calculation will result in negative value.
=> Fix: Similar to the fix on line: line:https://github.com/NVIDIA/NeMo/blob/7f3ac6b88289048643d445ec752a4d21547f2788/nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py#L226
We also set:
`num_available_samples: int = self.total_samples - self.consumed_samples % self.total_samples`

**Collection**: [Note which collection this PR will affect]

# Changelog 
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<!-- pylint-output-strict-mode-false -->

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module nemo.collections.nlp.data.language_modeling.megatron.megatron_batch_samplers
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:216:0: C0301: Line too long (139/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:217:0: C0301: Line too long (151/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:217:0: C0301: Line too long (151/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:114:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:139:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:140:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/nlp/data/language_modeling/megatron/megatron_batch_samplers.py:176:0: C0115: Missing class docstring (missing-class-docstring)

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Thank you for improving NeMo's documentation!

[🤖]: Hi @huvunvidia 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12736585203) for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g