Which function assigns grammatical labels to words in a sentence?

The correct answer is part of speech tagging, which is a function that identifies and assigns grammatical labels to each word in a sentence based on its role and function. This process categorizes words into various parts of speech such as nouns, verbs, adjectives, adverbs, and more. By determining the role of each word, part of speech tagging plays a critical role in understanding the structure and meaning of the text, facilitating further linguistic processing and analysis.

This function is essential for various natural language processing tasks, as it provides the foundational grammatical context necessary for more complex analyses, such as parsing or sentiment analysis. Through part of speech tagging, machine learning models and other algorithms can better comprehend and manipulate human language, leading to more accurate interpretations and responses.