>> 2) how would I go about grid search over different vectorizers (e.g. >> CountVectorizer(analyzer="word"), CountVectorizer(analyzer="char_wb"), and a >> FeatureUnion of the two)? > You could always use a FeatureUnion and give it different TransformerLists via the GridSearchCV (at least I think this should work). The the set of possible parameters becomes tree-structured, though, and we don't support this (yet?). You can give GridSearchCV not only a grid but also a list of grids. I would go with that. (is that sufficiently documented?)
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