title: Plot dendrogram using sklearn.AgglomerativeClustering
body: <p>I'm trying to build a dendrogram using the <code>children_</code> attribute provided by <code>AgglomerativeClustering</code>, but so far I'm out of luck. I can't use <code>scipy.cluster</code> since agglomerative clustering provided in <code>scipy</code> lacks some options that are important to me (such as the option to specify the amount of clusters). I would be really grateful for a any advice out there.  </p>
  
  <pre><code>    import sklearn.cluster
      clstr = cluster.AgglomerativeClustering(n_clusters=2)
      clusterer.children_
  </code></pre>