title: 'classifierType is not a constructor'
body: <p>I'm using the limdu library found here (<a href="https://www.npmjs.com/package/limdu#binary-classification" rel="nofollow noreferrer">https://www.npmjs.com/package/limdu#binary-classification</a>). I'm trying to combine the 'Multi-Label Classification' section with the 'Input Normalization' section to make the outputs all be lowercase, but I keep getting the following error:</p>
  <pre><code>/Users/nickbrinsmade/Desktop/limdutest/node_modules/limdu/classifiers/EnhancedClassifier.js:43
  this.classifier = new opts.classifierType();
                    ^
  
  TypeError: opts.classifierType is not a constructor
      at new EnhancedClassifier (/Users/myusr/Desktop/limdutest/node_modules/limdu/classifiers/EnhancedClassifier.js:43:20)
      at Object.&lt;anonymous&gt; (/Users/myusr/Desktop/limdutest/index.js:9:20)
      at Module._compile (internal/modules/cjs/loader.js:1072:14)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
      at Module.load (internal/modules/cjs/loader.js:937:32)
      at Function.Module._load (internal/modules/cjs/loader.js:778:12)
      at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
      at internal/main/run_main_module.js:17:47
  </code></pre>
  <p>My code Is seen below:</p>
  <pre><code>var limdu = require('limdu');
  
  var MyWinnow = limdu.classifiers.Winnow.bind(0, {retrain_count: 10});
   
  var textClassifier = new limdu.classifiers.multilabel.BinaryRelevance({
      binaryClassifierType: MyWinnow
  });
  
  intentClassifier = new limdu.classifiers.EnhancedClassifier({
      classifierType: textClassifier,  // same as in previous example
      normalizer: limdu.features.LowerCaseNormalizer
  }); //this declaration throws the error.
   
  intentClassifier.trainBatch([
      {input: {I:1,want:1,an:1,apple:1}, output: &quot;APPLE&quot;},
      {input: {I:1,want:1,a:1,banana:1}, output: &quot;BANANA&quot;},
      {input: {I:1,want:1,chips:1}, output: &quot;CHIPS&quot;}
      ]);
   
  console.log(intentClassifier.classify({I:1,want:1,an:1,apple:1,and:1,a:1,banana:1}));
  </code></pre>