Option to benchmark only one of the two libraries

examples/benchmarks.py

@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """ Benchmarking the library on inference and training """
-import tensorflow as tf
 
 # If checking the tensors placement
 # tf.debugging.set_log_device_placement(True)
@@ -23,15 +22,18 @@ from typing import List
 import timeit
 from transformers import is_tf_available, is_torch_available
 from time import time
-import torch
-
 import argparse
 import csv
 
-if not is_torch_available() or not is_tf_available():
-    raise ImportError("TensorFlow and Pytorch should be installed on the system.")
+if is_tf_available():
+    import tensorflow as tf
+    from transformers import TFAutoModel
+
+if is_torch_available():
+    import torch
+    from transformers import AutoModel
 
-from transformers import AutoConfig, AutoModel, AutoTokenizer, TFAutoModel
+from transformers import AutoConfig, AutoTokenizer
 
 input_text = """Bent over their instruments, three hundred Fertilizers were plunged, as 
 the Director of Hatcheries and Conditioning entered the room, in the 
@@ -434,26 +436,31 @@ def main():
     print("Running with arguments", args)
 
     if args.torch:
-        create_setup_and_compute(
-            model_names=args.models,
-            tensorflow=False,
-            gpu=args.torch_cuda,
-            torchscript=args.torchscript,
-            save_to_csv=args.save_to_csv,
-            csv_filename=args.csv_filename,
-            average_over=args.average_over
-        )
+        if is_torch_available():
+            create_setup_and_compute(
+                model_names=args.models,
+                tensorflow=False,
+                gpu=args.torch_cuda,
+                torchscript=args.torchscript,
+                save_to_csv=args.save_to_csv,
+                csv_filename=args.csv_filename,
+                average_over=args.average_over
+            )
+        else:
+            raise ImportError("Trying to run a PyTorch benchmark but PyTorch was not found in the environment.")
 
     if args.tensorflow:
-        create_setup_and_compute(
-            model_names=args.models,
-            tensorflow=True,
-            xla=args.xla,
-            save_to_csv=args.save_to_csv,
-            csv_filename=args.csv_filename,
-            average_over=args.average_over
-        )
-
+        if is_tf_available():
+            create_setup_and_compute(
+                model_names=args.models,
+                tensorflow=True,
+                xla=args.xla,
+                save_to_csv=args.save_to_csv,
+                csv_filename=args.csv_filename,
+                average_over=args.average_over
+            )
+        else:
+            raise ImportError("Trying to run a TensorFlow benchmark but TensorFlow was not found in the environment.")
 
 if __name__ == '__main__':
     main()