def write_gt(identifier2label, filepath):
    """
    Write ground truth to a file.

    Parameters
    ----------
    identifier2label : Dict[str, str]
    filepath : str
        Write to this CSV file.
    """
    with open(filepath, 'w') as f:
        for identifier, label in identifier2label.items():
            f.write('{};{}\n'.format(identifier, label))
