fix #4432

src/llamafactory/model/loader.py

@@ -14,6 +14,7 @@
 
 from typing import TYPE_CHECKING, Any, Dict, Optional, TypedDict
 
+import torch
 from transformers import AutoConfig, AutoModelForCausalLM, AutoModelForVision2Seq, AutoProcessor, AutoTokenizer
 from trl import AutoModelForCausalLMWithValueHead
 
@@ -175,6 +176,10 @@ def load_model(
 
     if not is_trainable:
         model.requires_grad_(False)
+        for param in model.parameters():
+            if param.data.dtype == torch.float32 and model_args.compute_dtype != torch.float32:
+                param.data = param.data.to(model_args.compute_dtype)
+
         model.eval()
     else:
         model.train()