Allow trainer to return eval. loss for CLIP-like models by ydshieh · Pull Request #20214 · huggingface/transformers

ydshieh · 2022-11-14T16:53:51Z

What does this PR do?

Allow trainer to give evaluation loss for CLIP-like models.

Currently, this line

transformers/src/transformers/trainer.py

Line 3192 in 07d8d6e

    
           has_labels = False if len(self.label_names) == 0 else all(inputs.get(k) is not None for k in self.label_names)

gives has_labels = False for CLIP-like models, and can't give loss value in the evaluation.

without this PR:

***** eval metrics *****
  epoch                   =        1.0
  eval_runtime            = 0:00:01.67
  eval_samples_per_second =      9.571
  eval_steps_per_second   =      4.785

with this PR.

***** eval metrics *****
  epoch                   =        1.0
  eval_loss               =     0.8159
  eval_runtime            = 0:00:01.66
  eval_samples_per_second =      9.598
  eval_steps_per_second   =      4.799

HuggingFaceDocBuilder · 2022-11-14T17:07:40Z

The documentation is not available anymore as the PR was closed or merged.

ydshieh · 2022-11-14T20:42:21Z

src/transformers/trainer.py

        """
        has_labels = False if len(self.label_names) == 0 else all(inputs.get(k) is not None for k in self.label_names)
+        # For CLIP-like models capable of returning loss values.
+        can_compute_loss = True if len(self.label_names) == 0 and self.can_return_loss else False


We need to restrict to len(self.label_names) == 0.

For models that has len(self.label_names) > 0, we should check if the inputs contain the required labels by the model - which is done one line above for has_labels.

can_compute_loss actually means can_compute_loss_without_labels, but maybe a too long name.

Can we rename all can_compute_loss to loss_without_labels then? It's more informative even if not completely perfect.

sgugger

Very nice idea thanks a lot! I left a few comments regarding naming and we can make the function can_return_loss a bit better, but overall great PR!

sgugger · 2022-11-15T14:07:29Z

src/transformers/trainer.py

        """
        has_labels = False if len(self.label_names) == 0 else all(inputs.get(k) is not None for k in self.label_names)
+        # For CLIP-like models capable of returning loss values.
+        can_compute_loss = True if len(self.label_names) == 0 and self.can_return_loss else False


Can we rename all can_compute_loss to loss_without_labels then? It's more informative even if not completely perfect.

sgugger · 2022-11-15T14:08:59Z

src/transformers/utils/generic.py

+        signature = inspect.signature(model_class.__call__)
+    else:
+        signature = inspect.signature(model_class.forward)
+    return [p for p in signature.parameters if p == "return_loss"]


I'd prefer if this returns a bool then rely on Python magic conversion to bools.
Also I think we should check if the default is True as the Trainer won't change the default.

I changed it to

any(p == "return_loss" for p in signature.parameters)

but do you mean we should have sth. like (conceptually)

any(p == "return_loss" and default_value(p) is True for p in signature.parameters)

?

Yes to the second!

sgugger · 2022-11-15T15:10:55Z

src/transformers/trainer.py

        """
        has_labels = False if len(self.label_names) == 0 else all(inputs.get(k) is not None for k in self.label_names)
+        # For CLIP-like models capable of returning loss values.
+        loss_without_labels = True if len(self.label_names) == 0 and self.can_return_loss and inputs.get("return_loss", None) is True else False


inputs will not contain return_loss if True is the default.

OK! I see all of our return_loss have None as default value (include CLIP), but I can add extra check to be sure

Oh in this case then your solution works.

ydshieh · 2022-11-15T16:32:33Z

src/transformers/trainer.py

+        # If `return_loss` is not specified or being `None` in `inputs`, we check if the default value of `return_loss`
+        # is `True` in `model.forward`.
+        return_loss = inputs.get("return_loss", None)
+        if return_loss is None:


If False, no need to check default value

ydshieh · 2022-11-15T16:36:28Z

src/transformers/utils/generic.py

+
+    for p in signature.parameters:
+        if p == "return_loss" and signature.parameters[p].default is True:
+            return True


Will return True only if the default value is True.

ydshieh · 2022-11-15T16:37:32Z

@sgugger Hopefully the change covers everything that could happen now and in the future.

sgugger

Perfect!

…20214) * Allow trainer to return loss for CLIP-like models * Apply suggestions * update * update * update Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

Allow trainer to return loss for CLIP-like models

3655431

ydshieh requested a review from sgugger November 14, 2022 17:35

ydshieh changed the title ~~Allow trainer to return loss for CLIP-like models~~ Allow trainer to return eval. loss for CLIP-like models Nov 14, 2022

ydshieh commented Nov 14, 2022

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sgugger reviewed Nov 15, 2022

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ydshieh added 2 commits November 15, 2022 15:25

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sgugger approved these changes Nov 15, 2022

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ydshieh merged commit 0d0d776 into main Nov 15, 2022

ydshieh deleted the clip_loss branch November 15, 2022 18:47

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