Text classification template with scikit-learn

[themrcesi]

Summary

This PR consists of a text classification template using scikit-learn as stated in #4.

Details

• Scikit-learn
• NLTK for stemming and lemmatization
• Example text files provided in the data/ folder (in spanish)
• test.py file added in order to check the functionality of the template code itself (needs to be removed before merging)

Checklist

• all tests are passing (see README.md on how to run tests)
• if you created a new template: it contains a file test-inputs.yml, which specifies a few input values to test the code template (the test is then automatically run by pytest)
• you formatted all code with black
• you checked all new functionality live, i.e. in the running web app
• any generated code is formatted nicely, both in .py and in .ipynb ("nicely" = comparable to the existing templates)
• you added comments in your code that explain what it does
• the PR explains in detail what's new

[themrcesi]

I´m having some problems executing the tests.

After installing the needed dependencies (pip install -r requirements-dev.txt), I get a strange error and I´m not able to run the tests.
File "B:\Anaconda3\lib\site-packages\hypothesis\internal\conjecture\shrinker.py", line 1447, in <module> @attr.s(slots=True, eq=False) TypeError: attrs() got an unexpected keyword argument 'eq'

@jrieke could you please run the test files for me? Meanwhile I´ll try to solve my problem.

[jrieke]

Oh sorry @themrcesi, didn't see this comment. That's strange since I don't use hypothesis actually. Just to be clear: Does this error come up when you do pip install -r requirements-dev.txt or when you run the tests? And could you send the complete output/error if there's anything else?

[themrcesi]

No problem @jrieke 😄

It was after installing the dev requirements, when I tried running the tests. Now this error is solved, it seemed to be something related to some package´s version.
However, I´m not able to run the tests since I obtain an error. This error must be my fault, because I´ve tried running the tests just from the forked version and I also obtain the same errors. The error is about Windows permission to access some files, a bit strange.

Everything is working fine but I´m not able to run the tests (btw they should pass). So I will try to fix that to be able to run the tests. If you have time and you can run the tests for me I´d appreciate it.

Once we can confirm that tests pass, this PR is ready to be merged.