Implemented #2516 (#2532)

* implemented #2516

* fix ruff error

* Update setup.py

removed torch dependency for ["dev"]

Co-authored-by: Lucain <lucainp@gmail.com>

---------

Co-authored-by: Lucain <lucainp@gmail.com>

Author: yuxi-liu-wired

src/huggingface_hub/hub_mixin.py

@@ -41,6 +41,8 @@
     import torch  # type: ignore
 
 if is_safetensors_available():
+    import packaging.version
+    import safetensors
     from safetensors.torch import load_model as load_model_as_safetensor
     from safetensors.torch import save_model as save_model_as_safetensor
 
@@ -827,17 +829,18 @@ def _load_as_pickle(cls, model: T, model_file: str, map_location: str, strict: b
 
     @classmethod
     def _load_as_safetensor(cls, model: T, model_file: str, map_location: str, strict: bool) -> T:
-        load_model_as_safetensor(model, model_file, strict=strict)  # type: ignore [arg-type]
-        if map_location != "cpu":
-            # TODO: remove this once https://github.com/huggingface/safetensors/pull/449 is merged.
-            logger.warning(
-                "Loading model weights on other devices than 'cpu' is not supported natively."
-                " This means that the model is loaded on 'cpu' first and then copied to the device."
-                " This leads to a slower loading time."
-                " Support for loading directly on other devices is planned to be added in future releases."
-                " See https://github.com/huggingface/huggingface_hub/pull/2086 for more details."
-            )
-            model.to(map_location)  # type: ignore [attr-defined]
+        if packaging.version.parse(safetensors.__version__) < packaging.version.parse("0.4.3"):
+            load_model_as_safetensor(model, model_file, strict=strict)  # type: ignore [arg-type]
+            if map_location != "cpu":
+                logger.warning(
+                    "Loading model weights on other devices than 'cpu' is not supported natively in your version of safetensors."
+                    " This means that the model is loaded on 'cpu' first and then copied to the device."
+                    " This leads to a slower loading time."
+                    " Please update safetensors to version 0.4.3 or above for improved performance."
+                )
+                model.to(map_location)  # type: ignore [attr-defined]
+        else:
+            safetensors.torch.load_model(model, model_file, strict=strict, device=map_location)
         return model