👉 Perplexity is a measure of how difficult it is to understand or interpret a given text or sentence. It is often used in natural language processing (NLP) tasks such as sentiment analysis, question answering, and machine translation. In simpler terms, perplexity represents the difficulty of understanding a particular piece of text by comparing its complexity to the minimum possible accuracy that can be achieved by guessing what it actually means. For example, if you were trying to understand whether a sentence is positive or negative,