Perplexity measures how well an AI such as ChatGPT can predict the next word. If it guesses correctly most of the time, it has low perplexity. If it is often wrong, the perplexity is high. The…

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Perplexity measures how well an AI can predict the next word. Lower perplexity indicates better AI models. Practical calculation involves probability calculation, logarithm, and average log probability.

What’s Perplexity in AI?