revert

requirements.txt

@@ -1,13 +1,14 @@
 pytorch-lightning==1.2.0rc0
 torch>=1.7  # TODO: regenerate weights with lewer PT version
-PyYAML>=5.1
+PyYAML==5.3.1
 Pillow>=7.2
 torchvision>=0.8  # lower to 0.7 after PT 1.6
-transformers>=4.0
-pytorch-tabnet==3.1
-datasets>=1.2, <1.3
-pandas>=1.1
-scikit-learn>=0.24
+transformers==4.2.2
+pytorch-tabnet==3.1.1
+datasets==1.2.1
+pandas==1.1.5 ; python_version < "3.7"
+pandas==1.2.2 ; python_version >= "3.7"
+scikit-learn==0.24.0
 numpy  # comes with 3rd-party dependency
 tqdm  # comes with 3rd-party dependency
 rouge-score>=0.0.4