Building Machine Learning Systems with Python - Third Edition

Slimming the classifier

It is always worth looking at the actual contributions of the individual features. For logistic regression, we can directly take the learned coefficients (clf.coef_) to get an impression of the features' impact:

We see that NumCodeLines, LinkCount, AvgWordLen, and NumTextTokens have the highest positive impact on determining whether a post is a good one, while AvgWordLen, LinkCount, and NumCodeLines have a say in that as well, but much less so. This means that being more verbose will more likely result in a classification as a good answer.

On the other side, we have NumAllCaps and NumExclams have negative weights one. ...