KeywordCoverageMetric

import { KeywordCoverageMetric } from "@mastra/evals/nlp";
 
const metric = new KeywordCoverageMetric();
 
const result = await metric.measure(
  "What are the key features of Python programming language?",
  "Python is a high-level programming language known for its simple syntax and extensive libraries.",
);
 
console.log(result.score); // Coverage score from 0-1
console.log(result.info); // Object containing detailed metrics about keyword coverage

import { KeywordCoverageMetric } from "@mastra/evals/nlp";
 
const metric = new KeywordCoverageMetric();
 
// Perfect coverage example
const result1 = await metric.measure(
  "The quick brown fox jumps over the lazy dog",
  "A quick brown fox jumped over a lazy dog",
);
// {
//   score: 1.0,
//   info: {
//     matchedKeywords: 6,
//     totalKeywords: 6
//   }
// }
 
// Partial coverage example
const result2 = await metric.measure(
  "Python features include easy syntax, dynamic typing, and extensive libraries",
  "Python has simple syntax and many libraries",
);
// {
//   score: 0.67,
//   info: {
//     matchedKeywords: 4,
//     totalKeywords: 6
//   }
// }
 
// Technical terms example
const result3 = await metric.measure(
  "Discuss React.js component lifecycle and state management",
  "React components have lifecycle methods and manage state",
);
// {
//   score: 1.0,
//   info: {
//     matchedKeywords: 4,
//     totalKeywords: 4
//   }
// }