Update folders or imports in quick start

[kjm0623v]

Hello. Thanks for ML for fairness!

(venv) ➜ experiments git:(master) ✗ python ./lending_demo.py --num_steps=500
Traceback (most recent call last):
File "./lending_demo.py", line 26, in
from agents import threshold_policies

I already use the PATH code
export PYTHONPATH="${PYTHONPATH}:/path/to/ml-fairness-gym"
After ./tests.sh
File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/traceback.py", line 285, in line
self._line = linecache.getline(self.filename, self.lineno).strip()
File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/linecache.py", line 16, in getline
lines = getlines(filename, module_globals)
File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/linecache.py", line 48, in getlines
for mod in sys.modules.values():
RuntimeError: dictionary changed size during iteration

And there I can not proceed anymore from here.

[hansa0]

Hi kjm0623v,

I wasn't able to re-create your error. Did you install the requirements as described in the installation instructions? Additionally, another common mistake (and one I made): when you ran export PYTHONPATH="${PYTHONPATH}:/path/to/ml-fairness-gym"
did you change "/path/to/ml-fairness-gym" to your specific path before running the command?

[Chuyun-Shen]

Hi kjm0623v,
Maybe you can check your path, use

import sys
print(sys.path)

make sure source root is in path