scikit-learn 0.22.2.post1 and tensorboard 2.2.0 that are incompatible with snorkel 0.9.5 are installed

Describe the bug

The following error messages occur when installing fonduer==0.8.0

ERROR: snorkel 0.9.5 has requirement scikit-learn<0.22.0,>=0.20.2, but you'll have scikit-learn 0.22.2.post1 which is incompatible.
ERROR: snorkel 0.9.5 has requirement tensorboard<2.0.0,>=1.14.0, but you'll have tensorboard 2.2.0 which is incompatible.

To Reproduce Steps to reproduce the behavior:

1. pip install fonduer==0.8.0 when pip==19.X (I tested on 19.2.3 and 19.3)

Expected behavior

No error is expected and compatible versions of scikit-learn and tensorboard are installed.

Error Logs/Screenshots

$ pip install     torch==1.4.0+cpu -f https://download.pytorch.org/whl/torch_stable.html     fonduer

...

ERROR: snorkel 0.9.5 has requirement scikit-learn<0.22.0,>=0.20.2, but you'll have scikit-learn 0.22.2.post1 which is incompatible.
ERROR: snorkel 0.9.5 has requirement tensorboard<2.0.0,>=1.14.0, but you'll have tensorboard 2.2.0 which is incompatible.
Installing collected packages: torch, numpy, scipy, pyyaml, soupsieve, beautifulsoup4, editdistance, lxml, treedlib, pickleshare, wcwidth, prompt-toolkit, pygments, backcall, ptyprocess, pexpect, decorator, parso, jedi, six, ipython-genutils, traitlets, ipython, psycopg2, sqlalchemy, werkzeug, wheel, certifi, urllib3, chardet, idna, requests, tensorboard-plugin-wit, markdown, oauthlib, requests-oauthlib, pyasn1, rsa, pyasn1-modules, cachetools, google-auth, google-auth-oauthlib, grpcio, protobuf, absl-py, tensorboard, joblib, scikit-learn, tqdm, emmental, munkres, pytz, python-dateutil, pandas, networkx, snorkel, wand, cymem, preshed, plac, wasabi, blis, murmurhash, srsly, thinc, spacy, fonduer
  Running setup.py install for pyyaml: started
    Running setup.py install for pyyaml: finished with status 'done'
  Running setup.py install for backcall: started
    Running setup.py install for backcall: finished with status 'done'
  Running setup.py install for psycopg2: started
    Running setup.py install for psycopg2: finished with status 'done'
  Running setup.py install for sqlalchemy: started
    Running setup.py install for sqlalchemy: finished with status 'done'
  Running setup.py install for absl-py: started
    Running setup.py install for absl-py: finished with status 'done'
  Running setup.py install for networkx: started
    Running setup.py install for networkx: finished with status 'done'
Successfully installed absl-py-0.9.0 backcall-0.1.0 beautifulsoup4-4.7.1 blis-0.2.4 cachetools-4.1.0 certifi-2020.4.5.1 chardet-3.0.4 cymem-2.0.3 decorator-4.4.2 editdistance-0.5.3 emmental-0.0.6 fonduer-0.8.0 google-auth-1.13.1 google-auth-oauthlib-0.4.1 grpcio-1.28.1 idna-2.9 ipython-7.13.0 ipython-genutils-0.2.0 jedi-0.16.0 joblib-0.14.1 lxml-4.5.0 markdown-3.2.1 munkres-1.1.2 murmurhash-1.0.2 networkx-2.3 numpy-1.18.2 oauthlib-3.1.0 pandas-0.25.3 parso-0.6.2 pexpect-4.8.0 pickleshare-0.7.5 plac-0.9.6 preshed-2.0.1 prompt-toolkit-3.0.5 protobuf-3.11.3 psycopg2-2.8.5 ptyprocess-0.6.0 pyasn1-0.4.8 pyasn1-modules-0.2.8 pygments-2.6.1 python-dateutil-2.8.1 pytz-2019.3 pyyaml-5.3.1 requests-2.23.0 requests-oauthlib-1.3.0 rsa-4.0 scikit-learn-0.22.2.post1 scipy-1.4.1 six-1.14.0 snorkel-0.9.5 soupsieve-2.0 spacy-2.1.9 sqlalchemy-1.3.16 srsly-1.0.2 tensorboard-2.2.0 tensorboard-plugin-wit-1.6.0.post3 thinc-7.0.8 torch-1.4.0+cpu tqdm-4.45.0 traitlets-4.3.3 treedlib-0.1.2 urllib3-1.25.8 wand-0.5.9 wasabi-0.6.0 wcwidth-0.1.9 werkzeug-1.0.1 wheel-0.34.2
WARNING: You are using pip version 19.2.3, however version 20.0.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

Environment (please complete the following information):

• OS: Debian (docker tag python:3.7-slim)
• PostgreSQL Version: N/A
• Poppler Utils Version: N/A
• Fonduer Version: 0.8.0

Additional context Add any other context about the problem here.

[HiromuHota]

As of pip version 20.1,

An alpha version of a new resolver is available via --unstable-feature=resolver (https://github.com/pypa/pip/issues/988)

It is still in an alpha stage and unstable, but this looks promising!

[HiromuHota]

Okay, pip with --use-feature=2020-resolver seems to be working.