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examples/prt14_qwen25vl/train_prt14.py

@@ -223,6 +223,8 @@ def main(cfg: DictConfig):
     
     # Unconditionally enable gradient checkpointing for memory efficiency
     reward_model.gradient_checkpointing_enable()
+    # Required for LoRA + Gradient Checkpointing to allow gradient flow
+    reward_model.enable_input_require_grads()
 
     # Define training arguments
     training_args = PRTTrainingArguments(