diff --git a/src/tools/ai/core.ts b/src/tools/ai/core.ts
new file mode 100644
index 0000000000..25bb807bba
--- /dev/null
+++ b/src/tools/ai/core.ts
@@ -0,0 +1,45 @@
+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) {
+		return this.mecab.wakachiSync(text);
+	}
+
+	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);
+	}
+}
diff --git a/src/tools/ai/predict-all-post-category.ts b/src/tools/ai/predict-all-post-category.ts
index 87e198b39b..058c4f99ef 100644
--- a/src/tools/ai/predict-all-post-category.ts
+++ b/src/tools/ai/predict-all-post-category.ts
@@ -1,31 +1,9 @@
-const bayes = require('./naive-bayes.js');
-const MeCab = require('mecab-async');
-
 import Post from '../../api/models/post';
-import config from '../../conf';
+import Core from './core';
 
-const classifier = bayes({
-	tokenizer: this.tokenizer
-});
-
-const mecab = new MeCab();
-if (config.categorizer.mecab_command) mecab.command = config.categorizer.mecab_command;
-
-// 訓練データ取得
-Post.find({
-	is_category_verified: true
-}, {
-	fields: {
-		_id: false,
-		text: true,
-		category: true
-	}
-}).then(verifiedPosts => {
-	// 学習
-	verifiedPosts.forEach(post => {
-		classifier.learn(post.text, post.category);
-	});
+const c = new Core();
 
+c.init().then(() => {
 	// 全ての(人間によって証明されていない)投稿を取得
 	Post.find({
 		text: {
@@ -45,7 +23,7 @@ Post.find({
 	}).then(posts => {
 		posts.forEach(post => {
 			console.log(`predicting... ${post._id}`);
-			const category = classifier.categorize(post.text);
+			const category = c.predict(post.text);
 
 			Post.update({ _id: post._id }, {
 				$set: {