fix #1000

Former-commit-id: 85de2d0a99e4a81fae890a963ccbb5c6142d52d4

README.md

@@ -369,8 +369,7 @@ python src/export_model.py \
     --template default \
     --finetuning_type lora \
     --checkpoint_dir path_to_checkpoint \
-    --output_dir path_to_export \
-    --fp16
+    --output_dir path_to_export
 ```
 
 ### API Demo

README_zh.md

@@ -368,8 +368,7 @@ python src/export_model.py \
     --template default \
     --finetuning_type lora \
     --checkpoint_dir path_to_checkpoint \
-    --output_dir path_to_export \
-    --fp16
+    --output_dir path_to_export
 ```
 
 ### API 服务

src/llmtuner/tuner/core/parser.py

@@ -9,10 +9,12 @@ from transformers.utils.versions import require_version
 from transformers.trainer_utils import get_last_checkpoint
 
 try:
-    from transformers.utils import is_torch_bf16_gpu_available, is_torch_npu_available
+    from transformers.utils import is_torch_bf16_gpu_available, is_torch_npu_available, is_torch_cuda_available
+    is_fp16_available = is_torch_cuda_available()
     is_bf16_available = is_torch_bf16_gpu_available()
     is_npu_available = is_torch_npu_available()
 except ImportError:
+    is_fp16_available = torch.cuda.is_available()
     is_bf16_available = torch.cuda.is_bf16_supported()
     is_npu_available = False
 
@@ -29,6 +31,17 @@ from llmtuner.hparams import (
 logger = get_logger(__name__)
 
 
+def _infer_dtype() -> torch.dtype:
+    if is_npu_available:
+        return torch.float16
+    elif is_bf16_available:
+        return torch.bfloat16
+    elif is_fp16_available:
+        return torch.float16
+    else:
+        return torch.float32
+
+
 def _parse_args(parser: HfArgumentParser, args: Optional[Dict[str, Any]] = None) -> Tuple[Any]:
     if args is not None:
         return parser.parse_dict(args)
@@ -211,7 +224,7 @@ def get_train_args(
     elif training_args.fp16:
         model_args.compute_dtype = torch.float16
     else:
-        model_args.compute_dtype = torch.float32
+        model_args.compute_dtype = _infer_dtype()
 
     model_args.model_max_length = data_args.cutoff_len
 
@@ -252,11 +265,6 @@ def get_infer_args(
             raise ValueError("Quantized model only accepts a single checkpoint. Merge them first.")
 
     # auto-detect cuda capability
-    if is_npu_available:
-        model_args.compute_dtype = torch.float16
-    elif is_bf16_available:
-        model_args.compute_dtype = torch.bfloat16
-    else:
-        model_args.compute_dtype = torch.float16
+    model_args.compute_dtype = _infer_dtype()
 
     return model_args, data_args, finetuning_args, generating_args