refactor inference, warn if model is frozen

src/axolotl/utils/models.py

@@ -183,6 +183,12 @@ def load_model(
         model.is_parallelizable = True
         model.model_parallel = True
 
+    requires_grad = []
+    for name, param in model.named_parameters(recurse=True):
+        if param.requires_grad:
+            requires_grad.append(f"{name}: {param.requires_grad}")
+    if len(requires_grad) == 0:
+        logging.warning("there are no parameters that require gradient updates")
 
     # TODO resume_from_checkpoint handling
     return model, tokenizer, lora_config