Remove np.array

[JEM-Mosig]

Proposed changes:

• Remove the explicit np.array conversion. It is not necessary and creates a deprecation warning, as described here
• fixes Issue with Diet Classifier #6282

Status (please check what you already did):

• added some tests for the functionality
• updated the documentation
• updated the changelog (please check changelog for instructions)
• reformat files using black (please check Readme for instructions)

[tabergma]

I just tested it. I still see

2020-08-10 08:49:11 INFO     rasa.nlu.model  - Starting to train component DIETClassifier
/Users/tabergma/Repositories/rasa/rasa/nlu/classifiers/diet_classifier.py:683: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray

when executing rasa train nlu. Can we please also fix this?

[JEM-Mosig]

I just tested it. I still see

2020-08-10 08:49:11 INFO     rasa.nlu.model  - Starting to train component DIETClassifier
/Users/tabergma/Repositories/rasa/rasa/nlu/classifiers/diet_classifier.py:683: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray

when executing rasa train nlu. Can we please also fix this?

This is odd. It vanished for me once I removed the array. Perhaps this also depends on the Python version... I'll check later this week.

[JEM-Mosig]

@tabergma What are your numpy and python versions?

[tabergma]

python3.7 and numpy==1.19.1

[tabergma]

Works as expected! Thanks 🚀