Hi,

I was trying to visualize the tree structure obtained from ward, but I
don't quite understand the data format of the children_ attribute.

The documentation reads:
children_       array-like, shape = [n_nodes, 2]        List of the children of
each nodes. Leaves of the tree do not appear.

So it is not a "left child-right Sibling representation", right? Are
there any pointers to that specific format or even better does anyone
have some advice on how to visualize the tree with
``scipy.cluster.hierarchy.dendrogram`` or ``graphviz``?


As a second, but slightly related question, is it possible to use the
ward on a n_features x n_features matrix (e.g. an adjacency matrix)?
It works, but I wasn't sure whether these results can be considered as
meaningful.

Help is much appreciated.

Thanks in advance,
 Matthias

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