blob: 5dcce262640d6574876ad429a18d35e487cf1f7e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
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);
}
}
|
