Detach logits before returning from function (#3554)

Author: pluesclues

unsloth/models/rl_replacements.py

@@ -510,7 +510,7 @@ def _get_per_token_logps_and_entropies(self, model, input_ids, attention_mask, l
 
             os.environ["UNSLOTH_RETURN_HIDDEN_STATES"] = "0"
             # logits = logits[:, :-1, :]  # (B, L-1, V), exclude the last logit: it corresponds to the next token pred
-            return logits, entropies  # logps, entropies
+            return logits.detach(), entropies  # logps, entropies
             # input_ids = input_ids[:, -logits_to_keep:]
             # For transformers<=4.48, logits_to_keep argument isn't supported, so here we drop logits ourselves.
             # See https://github.com/huggingface/trl/issues/2770