unsupervised learning-3 Dimension reduction: PCA, tf-idf, sparse matrix, twitter posts clustering Intrinsic dimension, text mining, Word frequency arrays, csr_matrix, TruncatedSVD Dimension reduction: PCA, Intrinsic dimension tf-idf, Word frequency arrays sparse matrix, csr_matrix, TruncatedSVD fun, pca, text mining, tf-idfdata cleasing, jupyter notebook, Python, statistic, text mining, unsupervised learning Posted on February 18, 2017