What is an N-gram? Choose one best answer:

Question

BlackTom AI · Accepted Answer

The question asks: What is an N-gram? Choose one best answer.
Option 1: 'List of N most frequently occurred tokens in a document' — This describes a top-N frequency list, not an N-gram. N-grams focus on sequences, not frequency ranking alone.
Option 2: 'List of N least frequently occurred tokens in a document' — Similarly, this targets infrequent items and does not capture the sequential token grouping that defines N-grams.
Option 3: 'Sequence of N tokens observed in a document' — This is the correct definition: an N-gram is a contiguous sequence of N items (tokens) from a text, capturing local word order and context.
Option 4: 'None of the above' — Since Option 3 accurately defines an N-gram, this option is incorrect.
To reinforce, remember that an N-gram is created by sliding a window of size N over a sequence of tokens, extracting all contiguous N-tuple sequences. This contrasts with frequency-based lists (Options 1 and 2) which do not constrain the items to be consecutive in the original text. The understanding that N-grams are about sequences of tokens, not mere frequencies, confirms Option 3 as the best choice.

What is an N-gram? Choose one best answer:单项选择题

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