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The Idea in a Nutshell

The Idea in a Nutshell . Classify a new item based on the classes of its k nearest neighbors. Sensitivity to k distance metric how the k points contribute to the decision . Computational Challenges. Distance metric needs to be tuned (e.g., parameter scaling).

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The Idea in a Nutshell

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  1. The Idea in a Nutshell • Classify a new item based on the classes of its k nearestneighbors. • Sensitivity to • k • distance metric • how the k points contribute to the decision

  2. Computational Challenges • Distance metric needs to be tuned (e.g., parameter scaling). • Given the neighbors, making a decision is tricky. • (Mixed) optimization. • Over-fitting should be avoided. • Finding the nearest neighbors might be time consuming. • Data management/data decomposition/ parallel processing.

  3. Simple Flexible Incremental Amenable to parallelization. Too simple Sensitive to the distance metric, k, and voting. Classification varies with the order data is provided. Pros Cons

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