[scikit-learn] LogisticRegression coef_ greater than n_features?

[pisymbol]

If that is the case, what order are the coefficients in then?

-aps

On Tue, Jan 8, 2019 at 12:48 AM Sebastian Raschka <mail at sebastianraschka.com>
wrote:

> E.g, if you have a feature with values 'a' , 'b', 'c', then applying the
> one hot encoder will transform this into 3 features.
>
> Best,
> Sebastian
>
> > On Jan 7, 2019, at 11:02 PM, pisymbol <pisymbol at gmail.com> wrote:
> >
> >
> >
> > On Mon, Jan 7, 2019 at 11:50 PM pisymbol <pisymbol at gmail.com> wrote:
> > According to the doc (0.20.2) the coef_ variables are suppose to be
> shape (1, n_features) for binary classification. Well I created a Pipeline
> and performed a GridSearchCV to create a LogisticRegresion model that does
> fairly well. However, when I want to rank feature importance I noticed that
> my coefs_ for my best_estimator_ has 24 entries while my training data has
> 22.
> >
> > What am I missing? How could coef_ > n_features?
> >
> >
> > Just a follow-up, I am using a OneHotEncoder to encode two categoricals
> as part of my pipeline (I am also using an imputer/standard scaler too but
> I don't see how that could add features).
> >
> > Could my pipeline actually add two more features during fitting?
> >
> > -aps
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