[hotfix] improve compatibility (hpcaitech#6165)

colossalai/utils/safetensors.py

@@ -1,5 +1,6 @@
 # a python safetensors serializer modified from https://github.com/huggingface/safetensors/blob/41bd1acf38ad28ac559522d40596c6c802f79453/safetensors/src/tensor.rs#L214
 import json
+import warnings
 from dataclasses import asdict, dataclass
 from typing import Dict, List, Optional, Tuple
 
@@ -8,8 +9,10 @@
 
 try:
     from tensornvme.async_file_io import AsyncFileWriter
-except ModuleNotFoundError:
-    raise ModuleNotFoundError("Please install tensornvme to use NVMeOptimizer")
+except Exception:
+    warnings.warn(
+        "Please install the latest tensornvme to use async save. pip install git+https://github.com/hpcaitech/TensorNVMe.git"
+    )
 _TYPES_INV = {v: k for k, v in _TYPES.items()}
 import io