tensorflow.python.framework.errors_impl.FailedPreconditionError: ./visual/models/transformer is not a directory

This error message is indicating that the directory ./visual/models/transformer does not exist or is not accessible. The code you are running is likely expecting this directory to exist and is failing because it cannot find it.

To fix this error, you should check that the directory exists and is accessible from the location where the code is being run. If the directory does not exist, create it. If it does exist but is not accessible, ensure that the necessary permissions are set to allow access to the directory.