Imageio (#454)

* fix benchmark

* add fomm and stylegan benchmark

* fix version of imageio

requirements.txt

@@ -3,6 +3,7 @@ PyYAML>=5.1
 scikit-image>=0.14.0
 scipy>=1.1.0
 opencv-python
+imageio==2.9.0
 imageio-ffmpeg
 librosa
 numba==0.53.1