def show_process_time(t1_start, t1_stop, t2_start, t2_stop):
    '\n    function to show elapsed time.\n    '
    print('\n')
    print('Elapsed time: {0:.4f} [sec]'.format((t1_stop - t1_start)))
    print('CPU process time: {0:.4f} [sec]'.format((t2_stop - t2_start)))
    print('Done.')
function to show elapsed time.
def show_process_time(t1_start, t1_stop, t2_start, t2_stop):
    '\n    \n    '
    print('\n')
    print('Elapsed time: {0:.4f} [sec]'.format((t1_stop - t1_start)))
    print('CPU process time: {0:.4f} [sec]'.format((t2_stop - t2_start)))
    print('Done.')