Remove pickle from dist ckpt

[Phlip79]

What does this PR do ?

Removing pickle from the repo. More context: https://gitlab-master.nvidia.com/ADLR/megatron-lm/-/issues/536. Tracking in #3324.

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[Phlip79]

/ok to test 17c0c6f

[sbak5]

torch.save is a pickle + appending it to zip archive. So, it doesn't avoid pickle.
https://github.com/pytorch/pytorch/blob/main/torch/serialization.py#L1184

[Phlip79]

torch.save is a pickle + appending it to zip archive. So, it doesn't avoid pickle. https://github.com/pytorch/pytorch/blob/main/torch/serialization.py#L1184

Great point. Marking this PR as draft until this is resolved.