无法使用 Apache 将 sklearn 导入 Google Compute Engine 上的 Flask App

Question

I can't import sklearn into the init .py file of a flask app I am running on a Google Compute Engine linux (Ubuntu 14.04) VM. The example code below works fine if I remove the import sklearn statement but will not work when that statement is included. The browser waits for a response from the server unit it times out. I can run any other web apps on the system as long as they don't use sklearn so I know the server works fine.

init .py

    from flask import Flask
    import sklearn

    app = Flask(__name__)

    @app.route("/")
    def hello():
        return "Test"

    if __name__ == "__main__":
        app.run()

The sklearn library is installed and I can import it and use it without problems in my other python files. Other libraries I need also import fine (numpy, pandas, bs4, ect). The problem is specific to sklearn and to the init .py file. It doesn't actually throw an error if I run the file from the terminal as it would if I tried to import a library that I didn't have installed. It just doesn't respond when I try to connect to it through the internet.

There are no other versions of python on the system. It is just the stock python 2.7 version that came with the linux VM.

Answer 1

The problem I was experiencing was the result of apache not working well the C dependencies in sklearn. More information can be found here ( https://github.com/naturalis/nbclassify/issues/2 ).

The solution:

Add this line

WSGIApplicationGroup %{GLOBAL}

below this line

WSGIScriptAlias / /var/www/FlaskApp/flaskapp.wsgi

in the Virtual Host config file (step 4 in this tutorial https://www.digitalocean.com/community/tutorials/how-to-deploy-a-flask-application-on-an-ubuntu-vps ).

The app now works with no issues.