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Fix a bug for CallbackHandler.callback_list #8052

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merged 3 commits into from
Oct 27, 2020
Merged

Fix a bug for CallbackHandler.callback_list #8052

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0fa0358
Fix callback_list
harupy Oct 26, 2020
7a2bc8e
Add test
harupy Oct 27, 2020
e31a9b2
Fix test
harupy Oct 27, 2020
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2 changes: 1 addition & 1 deletion src/transformers/trainer_callback.py
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Original file line number Diff line number Diff line change
Expand Up @@ -325,7 +325,7 @@ def remove_callback(self, callback):

@property
def callback_list(self):
return "\n".join(self.callbacks)
return "\n".join(cb.__class__.__name__ for cb in self.callbacks)

def on_init_end(self, args: TrainingArguments, state: TrainerState, control: TrainerControl):
return self.call_event("on_init_end", args, state, control)
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7 changes: 7 additions & 0 deletions tests/test_trainer_callback.py
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Expand Up @@ -221,3 +221,10 @@ def test_event_flow(self):
trainer.train()
events = trainer.callback_handler.callbacks[-2].events
self.assertEqual(events, self.get_expected_events(trainer))

# warning should be emitted for duplicated callbacks
with unittest.mock.patch("transformers.trainer_callback.logger.warn") as warn_mock:
trainer = self.get_trainer(
callbacks=[MyTestTrainerCallback, MyTestTrainerCallback],
)
assert str(MyTestTrainerCallback) in warn_mock.call_args[0][0]
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The warning message emitted here looks like:

You are adding a <class 'tests.test_trainer_callback.MyTestTrainerCallback'> to
the callbacks of this Trainer, but there is already one. The currentlist of callbacks is
:DefaultFlowCallback
TensorBoardCallback
MyTestTrainerCallback

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@harupy harupy Oct 27, 2020 •
edited
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call_args[0][0] corresponds to the first positional argument of logger.warn

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Looks good!