allowing from_pretrained to load from url directly

transformers/modeling_tf_utils.py

@@ -259,8 +259,10 @@ class TFPreTrainedModel(tf.keras.Model):
                         pretrained_model_name_or_path))
             elif os.path.isfile(pretrained_model_name_or_path):
                 archive_file = pretrained_model_name_or_path
+            elif os.path.isfile(pretrained_model_name_or_path + ".index"):
+                archive_file = pretrained_model_name_or_path + ".index"
             else:
-                raise EnvironmentError("Error file {} not found".format(pretrained_model_name_or_path))
+                archive_file = pretrained_model_name_or_path
 
             # redirect to the cache, if necessary
             try:

transformers/modeling_utils.py

@@ -365,9 +365,12 @@ class PreTrainedModel(nn.Module):
                         pretrained_model_name_or_path))
             elif os.path.isfile(pretrained_model_name_or_path):
                 archive_file = pretrained_model_name_or_path
-            else:
-                assert from_tf, "Error finding file {}, no file or TF 1.X checkpoint found".format(pretrained_model_name_or_path)
+            elif os.path.isfile(pretrained_model_name_or_path + ".index"):
+                assert from_tf, "We found a TensorFlow checkpoint at {}, please set from_tf to True to load from this checkpoint".format(
+                    pretrained_model_name_or_path + ".index")
                 archive_file = pretrained_model_name_or_path + ".index"
+            else:
+                archive_file = pretrained_model_name_or_path
 
             # redirect to the cache, if necessary
             try: