Week 1 MultiLabelBinarizer

[Radzivon]

In Week1 module during Multiclass training, scikit-learn raises this kind of exception:
"Scikit Learn Multilabel Classification: ValueError: You appear to be using a legacy multi-label data representation..."

So, I've found out that we should use MultiLabelBinarizer in order to preprocess labels, done.

But when we need to evaluate "val" dataset on trained classifiers, there is "mlb" variable referenced, which was not instantiated. I assume that it refers to "MultiLabelBinarizer". As you see, there is an inconsistency here, which currently should be manually fixed.