d data one can split according to
  the basket total weight or the effective entries in the basket. In this way the class can support weighted data
  sets. The splitting of the TKDTree class is instead fixed and based on the basket number of entries.</li>
<li>The tree can also be frozen to fix the splitting and behaving like a multi-dim histograms with bins with variables
  hyper-volumes.</li>
 <li>Auxiliary classes are provided like the node classes or the data point class, which can exists also with a com