运行demo时候遇到些问题

(pytorch) ✔ ~/projects/MultiTest [master|✚ 2…1] 
12:45 $ python demo.py 
demo.py:238: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "pc" or modality is "multi":
demo.py:238: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "pc" or modality is "multi":
demo.py:310: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "pc" or modality is "multi":
demo.py:310: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "pc" or modality is "multi":
demo.py:313: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "image" or modality is "multi":
demo.py:313: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "image" or modality is "multi":
demo.py:327: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "image":
demo.py:350: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "multi":
demo.py:367: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "image":
demo.py:376: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "pc" or modality is "multi":  # 点云与多模态显示
demo.py:376: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "pc" or modality is "multi":  # 点云与多模态显示
demo.py:392: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "image" or modality is "multi":
demo.py:392: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if modality is "image" or modality is "multi":
Traceback (most recent call last):
  File "demo.py", line 24, in <module>
    from mtest.core.sensor_simulation.lidar_simulator import complet_pc, lidar_simulation
ImportError: /home/bo/miniconda3/envs/pytorch/lib/python3.8/site-packages/mtest/core/sensor_simulation/lidar_simulator.so: undefined symbol: _PyMethodDescr_FastCallKeywords
请教一下最下面这个ImportError是怎么回事啊？谢谢！
MSFTest / MultiTest

运行demo时候遇到些问题 #1
