Global variable cannot be recognized in Python 3.9.16, NameError: name 'Q' is not defined - macos

Question

I'm trying to reproduce the result in a paper and its GitHub is this.
What is wired is, after I download the code and run the sample "small simulation.ipynb" in VScode with conda environment python 3.9.16, it shows
Output exceeds the size limit. Open the full output data in a text editor
---------------------------------------------------------------------------
RemoteTraceback Traceback (most recent call last)
RemoteTraceback:
"""
Traceback (most recent call last):
File "/Users/yanghongguo/anaconda3/envs/py3.7/lib/python3.8/multiprocessing/pool.py", line 125, in worker
result = (True, func(*args, **kwds))
File "/Users/yanghongguo/anaconda3/envs/py3.7/lib/python3.8/multiprocessing/pool.py", line 48, in mapstar
return list(map(*args))
File "/Users/yanghongguo/Downloads/SINC-master 2/small_example/../SINC_functions.py", line 249, in VI_VS_parallel
sig = np.ones((Q,1)) / 2500
NameError: name 'Q' is not defined
"""
The above exception was the direct cause of the following exception:
NameError Traceback (most recent call last)
Cell In[5], line 15
13 tol_elbo = 10.0
14 cpus = 1
---> 15 omega, EZ, phi,B,iters_total, elbo, elbo_score = SINC_update_tau(x, m, v0, v1, lamb, vB,a_gamma,b_gamma,a_pi,b_pi,a_tau,b_tau, max_iters, tol_prec, tol_elbo, cpus)
File ~/Downloads/SINC-master 2/small_example/../SINC_functions.py:495, in SINC_update_tau(x, m, v0, v1, lamb, vB, a_gamma, b_gamma, a_pi, b_pi, a_tau, b_tau, max_iters, tol_prec, tol_elbo, cpus)
493 pool = Pool(cpus)
494 args = [(Z[:,i] - B0[i],m,vB,sigs_j[i],B[i,],phi[i,],theta[i],a_gamma,b_gamma) for i in range(P)]
...
769 return self._value
770 else:
--> 771 raise self._value
NameError: name 'Q' is not defined
Q is defined as a global variable in the function. I asked my friend to run it in his computer and it was successful.
I tried different version of python but still got this error. Seems global variable is not identified in my environment.
My labtop is MAC M1 chip. What could be the reason that caused the error???