Fix is_onnx_available (#440)

* Fix is_onnx_available

Fix: If user install onnxruntime-gpu, is_onnx_available() will return False.

* add more onnxruntime candidates

* Run `make style`
Co-authored-by: anton-l <anton@huggingface.co>

src/diffusers/utils/import_utils.py

@@ -137,11 +137,19 @@ except importlib_metadata.PackageNotFoundError:
 
 
 _onnx_available = importlib.util.find_spec("onnxruntime") is not None
-try:
-    _onnxruntime_version = importlib_metadata.version("onnxruntime")
+if _onnx_available:
+    candidates = ("onnxruntime", "onnxruntime-gpu", "onnxruntime-directml", "onnxruntime-openvino")
+    _onnxruntime_version = None
+    # For the metadata, we have to look for both onnxruntime and onnxruntime-gpu
+    for pkg in candidates:
+        try:
+            _onnxruntime_version = importlib_metadata.version(pkg)
+            break
+        except importlib_metadata.PackageNotFoundError:
+            pass
+    _onnx_available = _onnxruntime_version is not None
+    if _onnx_available:
         logger.debug(f"Successfully imported onnxruntime version {_onnxruntime_version}")
-except importlib_metadata.PackageNotFoundError:
-    _onnx_available = False
 
 
 _scipy_available = importlib.util.find_spec("scipy") is not None