uWSGI and joblib Semaphore: Joblib will operate in serial mode

I'm running joblib in a Flask application living inside a Docker container together with uWSGI (started with threads enabled) which is started by supervisord.

The startup of the webserver shows the following error:

unable to load configuration from from multiprocessing.semaphore_tracker import main;main(15)
/usr/local/lib/python3.5/dist-packages/sklearn/externals/joblib/_multiprocessing_helpers.py:38: UserWarning:

[Errno 32] Broken pipe.  joblib will operate in serial mode

Any idea how to fix this and make joblib run in parallel? Thanks!

---

The following packages are installed in the docker container:

pytest==4.0.1
pytest-cov==2.6.0
flake8==3.6.0
Cython==0.29.3
numpy==1.16.1
pandas==0.24.0
scikit-learn==0.20.2
fancyimpute==0.4.2
scikit-garden==0.1.3
category_encoders==1.3.0
boto3==1.9.86
joblib==0.13.1
dash==0.37.0
dash-renderer==0.18.0
dash-core-components==0.43.1
dash-table==3.4.0
dash-html-components==0.13.5
dash-auth==1.3.2
Flask-Caching==1.4.0
plotly==3.6.1
APScheduler==3.5.3

from uWSGI and joblib Semaphore: Joblib will operate in serial mode