How many tokens?

Recall from previous chapters that how you tokenize text affects the n-gram statistics used in your model.

Going forward, you'll use alpha-numeric sequences, and only alpha-numeric sequences, as tokens. Alpha-numeric tokens contain only letters a-z and numbers 0-9 (no other characters). In other words, you'll tokenize on punctuation to generate n-gram statistics.

In this exercise, you'll make sure you remember how to tokenize on punctuation.

Assuming we tokenize on punctuation, accepting only alpha-numeric sequences as tokens, how many tokens are in the following string from the main dataset?

'PLANNING,RES,DEV,& EVAL      '

If you want, we've loaded this string into the workspace as SAMPLE_STRING, but you may not need it to answer the question.

Possible Answers

4, because RES and DEV are not tokens
4, because , and & are not tokens
7, because there are 4 different words, some commas, an & symbol, and whitespace
7, because there are 7 whitespaces

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Exercise

How many tokens?

Instructions

Possible Answers