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Why is it important to evaluate a text classification model on data where the predefined category is already known?

What is the purpose of text vectorization in text classification?

Which of the following words would likely have a high TF-IDF score in a dataset of customer reviews about electronics?

What does the accuracy metric measure in text classification?

How does TF-IDF improve upon Bag of Words?

ChatGPT is a popular text generation tool.

What does tokenization do?

An HR department is analyzing job descriptions. To improve keyword searches, their system converts all text into lowercase, removes punctuation, and eliminates extra spaces.  What preprocessing step is this?

A sentiment analysis on restaurant reviews is not producing meaningful results.  The team notices that words like “was,” “from,” and “what” appear frequently but do not contribute much to the analysis.  What preprocessing step should they consider?

What is the primary goal of a classification model in machine learning?