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Supervised learning and unsupervised learning are two fundamental approaches in machine learning, each serving distinct purposes:
In supervised learning, a model is trained using labeled data, with a desired outcome assigned to each input example. Accurate mapping of inputs to outputs is the aim of the model. Using techniques that minimize the prediction error (loss function), the model modifies its parameters during training by comparing its predictions to the actual labeled targets. This technique is frequently applied to tasks like natural language processing (recognizing sentiment in text), regression (predicting continuous values like house prices), and image classification (labeling photos with categories like “cat” or “dog”).
Unsupervised learning, on the other hand, works with unlabeled data and concentrates on finding structures and patterns within it. Without providing explicit feedback on the accuracy of its predictions, the algorithm examines the data to find patterns, similarities, or differences. Common uses include dimensionality reduction (compressing data while maintaining critical features), anomaly detection (finding odd patterns that do not match to expected behavior), and clustering similar data points together (customer segmentation based on behavior patterns).
The primary difference is in the kind of data that is used: unsupervised learning uses data without established labels in an effort to find relationships and hidden insights on its own, whereas supervised learning uses labeled data for training.