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fix(avocet): use_reentrant=False for gradient checkpointing

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Reentrant gradient checkpointing (the default) conflicts with Accelerate's
gradient accumulation context manager -- causes 'backward through graph a
second time' on the first training step. use_reentrant=False uses the
non-reentrant autograd hook path which is compatible with Accelerate >= 0.27.
This commit is contained in:
pyr0ball 2026-03-15 17:23:40 -07:00
parent 5dee23f53c
commit 753f8f5def
1 changed files with 6 additions and 1 deletions
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7
scripts/finetune_classifier.py
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@ -310,7 +310,12 @@ def run_finetune(model_key: str, epochs: int = 5, score_files: list[Path] | None
label2id=label2id,
)
if config["gradient_checkpointing"]:
model.gradient_checkpointing_enable()
# use_reentrant=False avoids "backward through graph a second time" errors
# when Accelerate's gradient accumulation context is layered on top.
# Reentrant checkpointing (the default) conflicts with Accelerate ≥ 0.27.
model.gradient_checkpointing_enable(
gradient_checkpointing_kwargs={"use_reentrant": False}
)
# --- TrainingArguments ---
training_args = TrainingArguments(