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tip number 34 its simple to add feature selection to a pipeline step one use select percentile to keep the highest scoring features step two add feature selection after pre-processing but before model building and then i say make sure to tune the percentile okay theres lots of ways to do feature selection in scikit-learn theres select percentile select k best select from model etc the point of this tip is that its actually not hard to include feature selection into a pipeline so weve got our first pipeline that just includes two steps a vectorizer and a classifier then in my second pipeline i include a vectorizer a feature selection object and then a classifier and youll notice that the first pipeline has this score the second pipeline has a higher accuracy because of the feature selection now what is this feature selection object well its a select percentile object where i define the statistical test a chi-squared test which is available within second learn and then i said i w
