50 lines
1 KiB
TypeScript
50 lines
1 KiB
TypeScript
const bayes = require('./naive-bayes.js');
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const MeCab = require('./mecab');
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import Post from '../../api/models/post';
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/**
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* 投稿を学習したり与えられた投稿のカテゴリを予測します
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*/
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export default class Categorizer {
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private classifier: any;
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private mecab: any;
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constructor() {
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this.mecab = new MeCab();
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// BIND -----------------------------------
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this.tokenizer = this.tokenizer.bind(this);
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}
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private tokenizer(text: string) {
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const tokens = this.mecab.parseSync(text)
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// 名詞だけに制限
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.filter(token => token[1] === '名詞')
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// 取り出し
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.map(token => token[0]);
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return tokens;
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}
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public async init() {
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this.classifier = bayes({
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tokenizer: this.tokenizer
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});
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// 訓練データ取得
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const verifiedPosts = await Post.find({
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is_category_verified: true
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});
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// 学習
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verifiedPosts.forEach(post => {
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this.classifier.learn(post.text, post.category);
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});
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}
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public async predict(text) {
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return this.classifier.categorize(text);
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}
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}
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