<p dir="auto">Does anyone know whether AdaBoostClassifier and DecisionTreeClassifier have been improved to work with sparse matrix input X? If not, are there any suggestions on current free AdaBoost package that works with sparse matrix? If I need to implement my own version of AdaBoost that can takes sparse matrix, what kind of change should I make?</p>
<p dir="auto">Thanks!</p>
<p dir="auto">AdaBoostClassifier does does not directly use the feature values of the input array, so it should not need to require the input to be dense. This limits its applicability to large scale high dimentional problems</p>