ImportError: No module named collections

[guokaiab]

Hi,
I used ubuntu 18.04, python2.7
when I using

python run.py infer_segment_fit experiments/config/demo_up/
--inp_fp demo/up/input/
--out_fp demo/up/output
--visualise render

I got a error information:
Traceback (most recent call last):
File "run.py", line 593, in
cli()
File "/home/pyenv/nbf/local/lib/python2.7/site-packages/click/core.py", line 764, in call
return self.main(*args, **kwargs)
File "/home/pyenv/nbf/local/lib/python2.7/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/home/pyenv/nbf/local/lib/python2.7/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/pyenv/nbf/local/lib/python2.7/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "run.py", line 226, in cli
model_mod = imp.load_source('_model', os.path.join(exp_name, 'model.py'))
File "experiments/config/demo_up/model.py", line 20, in
from up_tools.model import landmark_mesh_91
File "/home/guokai/soft/neural_body_fitting/external/up/up_tools/model.py", line 347, in
landmark_mesh_91 = pickle.load(inf)
ImportError: No module named collections
Can someone help me?