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src/p/y/pylearn2-HEAD/pylearn2/datasets/preprocessing.py   pylearn2(Download)
            from pylearn2 import pca
            self._pca = pca.CovEigPCA(self._num_components)
            self._pca.train(dataset.get_design_matrix())
            self._transform_func = function([self._input],
                                            self._pca(self._input))