title: What is weakly supervised learning (bootstrapping)?
body: <p>I understand the differences between supervised and unsupervised learning:</p>
  <p><strong>Supervised Learning</strong> is a way of &quot;teaching&quot; the classifier, using labeled data.</p>
  <p><strong>Unsupervised Learning</strong> lets the classifier &quot;learn by itself&quot;, for example, using clustering.</p>
  <p>But what is &quot;weakly supervised learning&quot;? How does it classify its examples?</p>