* Add _determine_best_metric and new saving logic.
1. Logic to determine the best logic was separated out from
`_save_checkpoint`.
2. In `_maybe_log_save_evaluate`, whether or not a new best metric was
achieved is determined after each evaluation, and if the save strategy
is "best' then the TrainerControl is updated accordingly.
* Added SaveStrategy.
Same as IntervalStrategy, but with a new attribute called BEST.
* IntervalStrategy -> SaveStrategy
* IntervalStratgy -> SaveStrategy for save_strat.
* Interval -> Save in docstring.
* Updated docstring for save_strategy.
* Added SaveStrategy and made according changes.
`save_strategy` previously followed `IntervalStrategy` but now follows
`SaveStrategy`.
Changes were made accordingly to the code and the docstring.
* Changes from `make fixup`.
* Removed redundant metrics argument.
* Added new test_save_best_checkpoint test.
1. Checks for both cases where `metric_for_best_model` is explicitly
provided and when it's not provided.
2. The first case should have two checkpoints saved, whereas the second
should have three saved.
* Changed should_training_end saving logic.
The Trainer saves a checkpoints at the end of training by default as
long as `save_strategy != SaveStrategy.NO`. This condition was modified
to include `SaveStrategy.BEST` because it would be counterintuitive that
we'd only want the best checkpoint to be saved but the last one is as
well.
* `args.metric_for_best_model` default to loss.
* Undo metric_for_best_model update.
* Remove checking metric_for_best_model.
* Added test cases for loss and no metric.
* Added error for metric and changed default best_metric.
* Removed unused import.
* `new_best_metric` -> `is_new_best_metric`
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
* Applied `is_new_best_metric` to all.
Changes were made for consistency and also to fix a potential bug.
---------
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
Co-authored-by: Zach Mueller <muellerzr@gmail.com>
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