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I'm using Sklearn's KNN to build a classifier and was wondering if there is any way to visualize the decision tree that the algorithm builds. Maybe something of this fashion

enter image description here

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$k$-NN does not build a decision tree to classify a new instance, it looks at the class of the most similar examples (the nearest neighbours) in the training set. So, in short, no you cannot get a decision tree from $k$-NN. You can build a decision tree for your dataset directly by using scikit-learn's DecisionTreeClassifier instead if you need a decision tree.

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  • $\begingroup$ Ok, thank you. This explains a lot! I had this constant confusion that the K-nn is supposed to build a decision tree, but now I get it $\endgroup$
    – nikolaevra
    Apr 4 '18 at 14:23
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You can obtain dendrograms in other algorithms of clustering, concretely hierarchical clustering. May be you talk about that, it's not a decision, but have a similar appearance.

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