Dear all,
I would like to ask how I can retrieve the category 0 on which a feature
has a most impact?
Specifically, now I am doing classification on several categories (labels),
say, Positive and Negative using AdaptiveLogisticRegression.
When dissecting this model, to get the category on which a feature has a
most impact,
I followed the codes from org.apache.mahout.classifier.sgd.SGDHelper, Line
74 (mahout-examples 0.7):
ngNames.get(w.getMaxImpact() + 1).
where ngNames is the label list (i.e. ["Positive", "Negative"]), and w is
the Weight instance of a feature.
However, the Weight class internally represents n labels using a vector
with n-1 positions ( am I correct?) ,
so it seems impossible to retrieve category 0, if a feature has a most
impact on it.
Could anyone tell me how to correctly retrieve category 0, if a feature has
a most impact on it?
Thanks in advance.
Regards,
Zheyi.
