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fix ppo callbacks #9872

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fix ppo callbacks #9872

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720adc5
fix ppo callbacks
leuitong Aug 7, 2026
31e4fad
fix isort
leuitong Aug 10, 2026
5b00975
fix isort
leuitong Aug 10, 2026
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8 changes: 7 additions & 1 deletion swift/rlhf_trainers/ppo_trainer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@

from swift.trainers import SwiftMixin
from swift.utils import patch_getattr
from swift.callbacks import callbacks_map

if version.parse(trl.__version__) >= version.parse('0.26.0'):
from trl.experimental.ppo import PPOTrainer as HFPPOTrainer
Expand Down Expand Up @@ -49,7 +50,6 @@ def __init__(self, model: PreTrainedModel, ref_model: PreTrainedModel, *_args, *
'reward_model',
'value_model',
'eval_dataset',
'callbacks',
]
}
parameters = inspect.signature(ppo_trainer_init).parameters
Expand All @@ -62,6 +62,12 @@ def __init__(self, model: PreTrainedModel, ref_model: PreTrainedModel, *_args, *
else:
new_kwargs['tokenizer'] = self.tokenizer
ppo_trainer_init(self, model=model, ref_model=ref_model, **new_kwargs)
# TRL's `PPOTrainer.__init__` rebuilds `callback_handler`, discarding the user callbacks that
# `SwiftMixin` registered on the HF Trainer. Re-register them onto the new handler here. We
# call `add_callback` directly (rather than `SwiftMixin._add_callbacks`/`_get_callbacks`,
# whose names/signatures differ between swift branches) so this works across versions.
for callback in self.args.callbacks:
self.add_callback(callbacks_map[callback](self.args, self))
unwrap_model = self.accelerator.unwrap_model(self.model)
patch_getattr(unwrap_model.__class__, 'policy')

Expand Down
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