title: k nearest neighbor classifier training sample size for each class
body: <p>Could someone please tell me whether the training sample sizes for each class need to be equal?</p>
  
  <p>Can I take this scenario?</p>
  
  <pre><code>          class1   class2  class3
  samples    400      500     300
  </code></pre>
  
  <p>or should all the classes have equal sample sizes?</p>