Return the URL for hosted file in Gluon repository.

    Parameters
    ----------
    namespace : str
        Namespace of the file.
    filename : str
        Name of the file

def _get_repo_file_url(namespace, filename):
    """Return the URL for hosted file in Gluon repository.

    Parameters
    ----------
    namespace : str
        Namespace of the file.
    filename : str
        Name of the file
    """
    return '{base_url}{namespace}/{filename}'.format(base_url=_get_repo_url(),
                                                     namespace=namespace,
                                                     filename=filename)