Hub issue.&#34;
            )
            if len(preproc.get_classes()) != num_classes:
                raise Exception(
                    &#34;Number of labels from preproc.get_classes() is not equal to num_classes. &#34;
                    + &#34;Something went wrong. Please open GitHub issue.&#34;
                )
    else:
        if not preproc.get_classes():
            raise Exception(
                &#34;This is supposed to be a classification problem, but preproc.get_classes() is empty. &#34;
