Description
I'm using tslearn to launch an app on heroku. When installing packages via requirements.txt, it always gave this error message "No module named 'numpy'", corresponding to this line(https://github.com/rtavenar/tslearn/blob/master/setup.py#L2). I'm able to install numpy first then add tslearn with heroku push. I guess these environments don't have numpy pre-installed so we probably need to handle dependencies differently?