| classification_metrics | Calculate binary classification metrics |
| cosine_similarity | Compute cosine similarity |
| document_term_matrix | Construct a document-term matrix |
| extract_html_dir | Extract text from a directory of HTML files |
| extract_html_text | Extract readable text from HTML |
| extract_keywords | Extract top TF-IDF keywords |
| fit_naive_bayes | Fit a multinomial Naive Bayes text classifier |
| f_measure | F-measure |
| preprocess_text | Normalize text for document-term analysis |
| read_label_file | Read a one-label-per-line file |
| split_sentences | Split text into sentences |
| stratified_folds | Create stratified cross-validation folds |
| tf_idf | Calculate TF-IDF weights |