The setting for normalize weights informs the classifier whether it should take into account the number of texts for each tag when defining its probability.

If your tags are imbalanced, with one tag having the overwhelming majority of texts, then you might consider normalizing the weights to equal them out and see if it helps the classifier performance.

Alternatively, if you want to have the classifier ignore the imbalance, turn off this setting.

By default weight normalization is enabled.

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