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don't create a reference model if grpo beta is 0.0 #2983

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Merged
winglian merged 1 commit into from
Jul 27, 2025
Merged

don't create a reference model if grpo beta is 0.0 #2983

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5 changes: 4 additions & 1 deletion src/axolotl/train.py
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Original file line number Diff line number Diff line change
Expand Up @@ -115,8 +115,11 @@ def setup_reference_model(
LOG.debug("Passing model_ref: None to RL trainer")
model_ref = None # explicit setting to None
else:
reference_model: bool = True
if cfg.rl == RLType.GRPO and cfg.trl.beta == 0:
reference_model = False
# load the model again for model_ref/baseline
model_loader = ModelLoader(cfg, tokenizer, reference_model=True)
model_loader = ModelLoader(cfg, tokenizer, reference_model=reference_model)
model_ref, _ = model_loader.load()
return model_ref

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