text: 'use strict';
  
  ((app) => {
  	// sample
      app.sample = require('./libs/sample');
  
  	// feature selection
  	app.feature = {};
  	app.feature.tfidf = require('./libs/feature-selection/tfidf');
  
      // classification
      app.bayes = app.Bayes = require('./libs/bayes');
      app.knn = app.kNN = require('./libs/knn');
      app.cnn = app.CNN = require('./libs/cnn');
  	app.logistic = app.Logistic = require('./libs/logistic');
  	app.kMeans = app.kmeans = require('./libs/kmeans');
  
      // recommendation
      app.collaborativeFiltering = app.cf = app.CF = require('./libs/cf');
  
      // evaluate
      app.eval = app.evaluate = app.evaluation = require('./libs/evaluation/index');
  })(module.exports);
  