fix: Temporarily remove torch gpu support

Author: Chenghao Tan

requirements-dev.txt

@@ -27,7 +27,7 @@ sphinx==4.0.2
 sphinx_autodoc_typehints==1.12.0
 sphinx-rtd-theme==0.5.2
 tensorflow==1.14.0
-torch==1.7.0+cu110 -f https://download.pytorch.org/whl/torch_stable.html
+torch==1.7.0 -f https://download.pytorch.org/whl/torch_stable.html
 torchvision==0.8.1
 PySMT==0.9.5
 xgboost==1.4.2