python natural-language-processing regular-expression n-grams penn-treebank tokenization stemming hmm-model lemmatization basic-programs chunker bigram-model trigram-model word-frequency-count unigram-model parts-of-speech-tagging pos-penn-treebank description-of-code lemmata stem-words

visualization python neural-network histogram naive-bayes-classifier data-analysis principal-component-analysis apriori-algorithm dbscan-clustering id3-algorithm k-means-clustering comparation association-rule-mining fp-growth-algorithm data-pre j48-classifier handling-missing-value birch-clustering students-acedemic-dataset description-of-code