[Backend][Regression] Rolling back interactive backend selection #1424
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DGL currently asks for backend selection in standard input, which makes some automation (e.g. pip/docker installation) crash. This reverts to the previous behavior of assuming PyTorch when backend is not given. However, it also prints a warning in standard error asking for users to change the backend explicitly in either config file or
DGLBACKENDenvironment variable if they wish.