The issue is that the Pythonpath is used only for running the test suite, not when loading libraries. This causes the libraries to turn up red and documentation and auto-completion to be unavailable.

PYTHONPATH="$ (dirname $0)/..":$PYTHONPATH in dist_train.sh file, there is a line ''PYTHONPATH="$ (dirname $0)/..":$PYTHONPATH '', what does it mean? I have konwn that it is about PYTHONPATH.