KNN Classification using Scikit-learn: Learn K-Nearest Neighbor(KNN) Classification and build a KNN classifier using Python Scikit-learn package.

Learn K-Nearest Neighbor(KNN) Classification and build a KNN classifier using Python Scikit-learn package.

K Nearest Neighbor(KNN) is a very simple, easy to understand, versatile, and one of the topmost machine learning algorithms. KNN used in a variety of applications such as finance, healthcare, political science, handwriting detection, image recognition, and video recognition. In Credit ratings, financial institutes will predict the credit rating of customers. In loan disbursement, banking institutes will predict whether the loan is safe or risky. In political science, classifying potential voters in two classes will vote or won’t vote. KNN algorithm used for both classification and regression problems. KNN algorithm based on the feature similarity approach.

In this tutorial, you are going to cover the following topics:

- K-Nearest Neighbor Algorithm
- How does the KNN algorithm work?
- Eager Vs Lazy learners
- How do you decide the number of neighbors in KNN?
- Curse of Dimensionality
- Classifier Building in Scikit-learn
- Pros and Cons
- How to improve KNN performance?
- Conclusion

KNN is a non-parametric and lazy learning algorithm. Non-parametric means there is no assumption for underlying data distribution. In other words, the model structure determined from the dataset. This will be very helpful in practice where most of the real-world datasets do not follow mathematical theoretical assumptions. The lazy algorithm means it does not need any training data points for model generation. All training data used in the testing phase. This makes training faster and testing phase slower and costlier. The costly testing phase means time and memory. In the worst case, KNN needs more time to scan all data points, and scanning all data points will require more memory for storing training data.

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