What is the difference between supervised, unsupervised, and reinforcement learning?

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1. Supervised Learning

  • Definition: The model learns from labeled data (input–output pairs).

  • How it works: The algorithm is trained with examples where the correct answer is already known. It maps inputs to outputs.

  • Goal: Predict outcomes for new, unseen data.

  • Examples: Email spam detection, predicting house prices, sentiment analysis.

2. Unsupervised Learning

  • Definition: The model learns from unlabeled data (only inputs, no predefined outputs).

  • How it works: The algorithm tries to find hidden patterns, structures, or groupings in the data.

  • Goal: Discover relationships or clusters in data.

  • Examples: Customer segmentation, market basket analysis, anomaly detection.

3. Reinforcement Learning

  • Definition: The model learns by interacting with an environment and receiving rewards or penalties based on actions.

  • How it works: The agent tries actions, observes outcomes, and adjusts strategies to maximize cumulative rewards.

  • Goal: Learn an optimal policy for decision-making.

  • Examples: Game-playing AI (like AlphaGo), robotics, recommendation systems.

Key Difference in a Line

  • Supervised: Learn from labeled data (teacher present).

  • Unsupervised: Learn from unlabeled data (no teacher, find structure).

  • Reinforcement: Learn from trial and error with rewards (self-learning agent).

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