Update requirements.txt

requirements.txt

@@ -66,8 +66,6 @@ six==1.15.0
 tensorboard==2.4.1
 tensorboard-plugin-wit==1.8.0
 tensorboardX==2.1
-tensorflow-estimator==2.4.0
-tensorflow-gpu==2.4.1
 termcolor==1.1.0
 text-unidecode==1.3
 thulac==0.2.1