add generic torchmetric ppl logging on esm2 #557
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Summary
Logging perplexity through
torchmetric.text.PerplexityDetails
Pipeline parallel last stage is handled in
training_stepandvalidation_step. Generic torchmetric seems to handle tensor parallelism without any noticeable difference, where the logits are already provided intraining/validation_stepand no backward pass is needed.However, valid_ppl does not seem to work properly.
Usage