removing torch.cuda.empty_cache() from TF function (#3267)

torch.cuda.empty_cache() was being called from a TF function (even when torch is unavailable)
not sure any replacement is needed if TF OOMs

examples/benchmarks.py

@@ -532,7 +532,6 @@ def _compute_tensorflow(
 
                     except tf.errors.ResourceExhaustedError as e:
                         print("Doesn't fit on GPU.", e)
-                        torch.cuda.empty_cache()
                         dictionary[model_name]["results"][batch_size][slice_size] = "N/A"
                         dictionary[model_name]["memory"][batch_size][slice_size] = "N/A"
     return dictionary