从tobii_research导入HMDLensConfiguration给出错误ImportError：无法导入名称HMDLensConfiguration

Question

我已经在Windows 10系统上的Python 2.7上使用pip安装了Tobii Pro SDK。我正在使用Tobii网站上提供的get_hmd_lens_configuration.py脚本（可在http://devtobiipro.azurewebsites.net/tobii.research/python/reference/1.7.0.8-alpha-g6c0fdf3/hmd_calibration_8py-example.html上找到该脚本）只是为了了解其工作原理。但是，执行脚本时出现错误“导入错误：无法导入名称HMDLensConfiguration”。

import tobii_research as tr

found_eyetrackers = tr.find_all_eyetrackers()    
my_eyetracker = found_eyetrackers[0]
from tobii_research import HMDLensConfiguration
lens_configuration = my_eyetracker.get_hmd_lens_configuration()

print("Got HMD lens configuration from tracker with serial number {0}:".format(my_eyetracker.serial_number))
print("Left: {0}".format(lens_configuration.left))
print("Right: {0}".format(lens_configuration.right))

from tobii_research import HMDLensConfiguration
ImportError: cannot import name HMDLensConfiguration