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* NLP Word Frequency Algorithms * Added type hints and Wikipedia link to tf-idf * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Fix line length for flake8 * Fix line length for flake8 V2 * Add line escapes and change int to float * Corrected doctests * Fix for TravisCI * Fix for TravisCI V2 * Tests passing locally * Tests passing locally * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update machine_learning/word_frequency_functions.py Co-authored-by: Christian Clauss <cclauss@me.com> * Add doctest examples and clean up docstrings Co-authored-by: Christian Clauss <cclauss@me.com>