Add use_auth to load_datasets for private datasets to PT and TF examples (#16521)

* fix formatting and remove use_auth

* Add use_auth_token to Flax examples

examples/pytorch/token-classification/run_ner.py

@@ -249,7 +249,10 @@ def main():
     if data_args.dataset_name is not None:
         # Downloading and loading a dataset from the hub.
         raw_datasets = load_dataset(
-            data_args.dataset_name, data_args.dataset_config_name, cache_dir=model_args.cache_dir
+            data_args.dataset_name,
+            data_args.dataset_config_name,
+            cache_dir=model_args.cache_dir,
+            use_auth_token=True if model_args.use_auth_token else None,
         )
     else:
         data_files = {}