add default to pop

src/transformers/generation_utils.py

@@ -846,7 +846,7 @@ def _validate_model_kwargs(self, model_kwargs: Dict[str, Any]):
  # Excludes arguments that are handled before calling the any model function
  if self.config.is_encoder_decoder:
  for key in ["decoder_input_ids"]:
- model_kwargs.pop(key)
+ model_kwargs.pop(key, None)
 
  unused_model_args = []
  model_args = set(inspect.signature(self.prepare_inputs_for_generation).parameters)