Problems that cannot be found in the reference library

If a reference library cannot be found, the possible causes are as follows:

• If the reference library is a folder or file in the current directory or subdirectory, add the parent directory to the PYTHONPATH environment variable.
• If the reference library that cannot be found is the package that needs to be installed using pip according to requirements.txt, run the pip install package name command to install the package. If the installation fails, run the git clone command to clone the installation package and run the python3 setup.py install command to install it.
• Check whether the readme.md file specifies that the reference library that cannot be found needs to be installed after being downloaded using the git clone command. If yes, download and install the reference library as required.