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fix: prevent gradients from flowing through the reference model's logits

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Goekdeniz-Guelmez 2025-02-09 17:02:58 +01:00
parent 54179901b5
commit a527cdb39b
1 changed files with 1 additions and 1 deletions
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llms/mlx_lm/tuner/grpo_trainer.py
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@ -189,7 +189,7 @@ def compute_kl(logprobs1, logprobs2):
def compute_policy_ratio(current_logprobs, ref_logprobs): def compute_policy_ratio(current_logprobs, ref_logprobs):
return mx.exp(mx.array(current_logprobs - ref_logprobs, dtype=mx.float32)) return mx.exp(mx.array(current_logprobs - mx.stop_gradient(ref_logprobs), dtype=mx.float32))
def grpo_loss( def grpo_loss(