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These model viewers include a Tree tab:
k-Means and O-Cluster model viewer for the Clustering models
Decision Tree model viewer for the DT Classification model
The Tree tab of the model viewer illustrates how the rules generated by the model are related. These trees are sometime large and complex. You can use the Structure window to navigate among the nodes of the tree, just as you navigate among the nodes of a workflow. In the Structure window, select a node or an item in the Link folder. The node or link in the model viewer is automatically highlighted.