K-Nearest Neighbors (KNN)
📘 Artificial Intelligence & Machine Learning Basics
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📅 Nov 05, 2025
⏱ Estimated reading time: 1 min
Definition:
A supervised learning algorithm that classifies a data point based on the majority class of its nearest neighbors.
Key Points:
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Distance-based: Uses Euclidean, Manhattan, or other distance metrics
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Simple and non-parametric
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Works for classification and regression
Applications:
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Handwriting recognition
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Image classification
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Recommender systems
Advantages:
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Simple to implement
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No training phase required
Limitations:
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Slower for large datasets
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Sensitive to irrelevant or noisy features
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