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Non-negative data

Which of the following 2-dimensional arrays are examples of non-negative data?

  1. A tf-idf word-frequency array.
  2. An array daily stock market price movements (up and down), where each row represents a company.
  3. An array where rows are customers, columns are products and entries are 0 or 1, indicating whether a customer has purchased a product.

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Unsupervised Learning in Python

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