You are developing a text processing solution. You have the following function. You call the function and use the following string as the second argument. Our tour of London included a visit to…

Key phrase extraction typically identifies important noun phrases or concepts within text. In the sentence "Our tour of London included a visit to Buckingham Palace", "London" and "Buckingham Palace" are the primary named entities and key locations, which are the most salient key phrases.

"Tour" and "visit" are verbs or less significant common nouns in this context, and not typically identified as key phrases by language models designed to extract salient concepts.

While "London" is a key phrase, "Tour" is generally not considered a primary key phrase compared to named entities or more specific concepts.

This choice represents the entire sentence or a significant portion of it, which is not what key phrase extraction aims to do; it extracts specific, concise phrases.