To create an array in Python, we can use a type of variable called a “dictionary.” This is an associative array, meaning that it is made of value/key pairs. This looks like so: ...

Using NumPy for array and matrix math in Python Many mathematical operations, especially in machine learning or data science , involve working with matrixes , or lists of numbers.

Using Python and Scikit-learn, you have learned how to build your own – and have learned the basics of TF-IDF and of non-negative matrix factorization in the process. More resources: ...