Rename

src/tools/analysis/core.ts

@@ -0,0 +1,51 @@
+const bayes = require('./naive-bayes.js');
+const MeCab = require('mecab-async');
+
+import Post from '../../api/models/post';
+import config from '../../conf';
+
+/**
+ * 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
+ */
+export default class Categorizer {
+	private classifier: any;
+	private mecab: any;
+
+	constructor() {
+		this.mecab = new MeCab();
+		if (config.categorizer.mecab_command) this.mecab.command = config.categorizer.mecab_command;
+
+		// BIND -----------------------------------
+		this.tokenizer = this.tokenizer.bind(this);
+	}
+
+	private tokenizer(text: string) {
+		const tokens = this.mecab.parseSync(text)
+			// 名詞だけに制限
+			.filter(token => token[1] === '名詞')
+			// 取り出し
+			.map(token => token[0]);
+
+		return tokens;
+	}
+
+	public async init() {
+		this.classifier = bayes({
+			tokenizer: this.tokenizer
+		});
+
+		// 訓練データ取得
+		const verifiedPosts = await Post.find({
+			is_category_verified: true
+		});
+
+		// 学習
+		verifiedPosts.forEach(post => {
+			this.classifier.learn(post.text, post.category);
+		});
+	}
+
+	public async predict(text) {
+		return this.classifier.categorize(text);
+	}
+}