Benchmarks (#4912)

* finish benchmark

* fix isort

* fix setup cfg

* retab

* fix time measuring of tf graph mode

* fix tf cuda

* clean code

* better error message

examples/requirements.txt

@@ -8,3 +8,8 @@ tensorflow_datasets
 pytorch-lightning==0.7.6
 matplotlib
 git-python==1.0.3
+faiss
+streamlit
+elasticsearch
+pandas
+nlp