ModuleNotFoundError: No module named 'numpy'

• face_recognition version: latest
• Python version: 3.6
• Operating System: Debian Stretch

Description

I took the dockerfile and tried to install the repo on my Raspberry Pi 3, but i alwas get an error because of ModuleNotFoundError: No module named 'numpy' at setup.py.

What I Did

Downloaded the repo files and tried to install throught the dockerfile:
https://github.com/ageitgey/face_recognition/blob/master/Dockerfile

Running setup.py bdist_wheel for scipy: finished with status 'error'
[main]    Complete output from command /usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-1lmk6ekg/scipy/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpndaspagjpip-wheel- --python-tag cp36:
[main]    Traceback (most recent call last):
[main]      File "<string>", line 1, in <module>
[main]      File "/tmp/pip-build-1lmk6ekg/scipy/setup.py", line 418, in <module>
[main]        setup_package()
[main]      File "/tmp/pip-build-1lmk6ekg/scipy/setup.py", line 398, in setup_package
[main]        from numpy.distutils.core import setup
[main]    ModuleNotFoundError: No module named 'numpy'
[main]    ----------------------------------------
[main]    Failed building wheel for scipy
[main]  
[main]    Running setup.py clean for scipy
[main]    Complete output from command /usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-1lmk6ekg/scipy/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" clean --all:
[main]    `setup.py clean` is not supported, use one of the following instead:
[main]      - `git clean -xdf` (cleans all files)
[main]      - `git clean -Xdf` (cleans all versioned files, doesn't touch
[main]                          files that aren't checked into the git repo)
[main]    Add `--force` to your command to use it anyway if you must (unsupported).
[main]    ----------------------------------------
[main]    Failed cleaning build dir for scipy
[main]  
[main]  Successfully built face-recognition-models numpy Pillow
[main]  Failed to build scipy
[main]  Installing collected packages: face-recognition-models, Click, numpy, Pillow, scipy
[main]    Running setup.py install for scipy: started

Start with the repository Dockerfile and the reported scipy setup.py traceback, then reproduce the installation on the stated Raspberry Pi, Debian Stretch, and Python 3.6 environment. Determine whether the failure is reproducible from the provided Dockerfile; the issue does not define a specific code change or acceptance test, so a maintainer should clarify the expected fix.