Create a graph name using the name of the caller.

    :param suffix: optional suffix to add to name
    :param dirname: optional directory name

    :return: path for the named graph
    :rtype: string

def create_graph_name(suffix='', dirname=None):
    """Create a graph name using the name of the caller.

    :param suffix: optional suffix to add to name
    :param dirname: optional directory name

    :return: path for the named graph
    :rtype: string

    """
    if suffix:
        suffix = '-%s' % suffix
    caller = get_callers_name(level=3)
    name = '%s%s%s%s' % (__prefix, caller, suffix, __suffix)
    if dirname:
        name = os.path.join(dirname, name)
    return name