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19 Oct/25

How Machines Learn

Overview

In this lesson, you will learn:

  • How machines learn from data to make predictions.
  • The basic workflow: data → patterns → predictions.
  • Practical examples of Machine Learning in real-world applications.
  • Hands-on activities to see ML in action.

By the end, you will understand the core ML process that powers AI and LLMs.


Key Concepts

  • Machine Learning (ML): A subset of AI where machines improve performance by learning patterns from data.
  • Data: The raw information used to train models.
  • Patterns: Insights or correlations detected from data.
  • Predictions: Output or decisions made by the AI based on learned patterns.
  • Supervised vs. Unsupervised Learning: Labeled data vs. discovering patterns on unlabeled data.

Concept Explanation

1. How Machines Learn

  1. Collect Data: Gather information about the task (e.g., emails, images, sales records).
  2. Analyze Patterns: AI identifies trends, correlations, or rules from the data.
  3. Make Predictions: Use patterns to predict outcomes or classify new data.
  4. Iterate & Improve: Models learn from new data and feedback over time.

2. Types of Machine Learning

  • Supervised Learning: Learns from labeled data to predict outcomes.
    • Example: Predict house prices from features (size, location).
  • Unsupervised Learning: Finds hidden patterns without labels.
    • Example: Group customers into segments based on behavior.
  • Reinforcement Learning: Learns by trial and error with feedback (rewards/punishments).
    • Example: Training a robot to navigate a maze.

3. Beginner-Friendly Strategies

  • Start with small datasets to understand patterns.
  • Visualize data using charts or graphs.
  • Experiment with simple tasks, like predicting grades or sorting images.
  • Observe how accuracy improves with more data and iteration.

Practical Examples

Example 1 – Predicting Grades (Supervised Learning)

Data: Student study hours and test scores
Pattern: More study hours → higher score
Prediction: A student who studies 5 hours → expected score 85%

Example 2 – Customer Segmentation (Unsupervised Learning)

Data: Customer purchase history
Pattern: Similar purchase behaviors grouped together
Prediction: Group A → prefers electronics, Group B → prefers clothing

Example 3 – Game AI (Reinforcement Learning)

Data: Actions taken in game and outcomes
Pattern: Moves leading to points are reinforced
Prediction: AI learns optimal moves to win the game

Tools for Hands-On Practice

  • Google Teachable Machine: Visual and interactive ML experiments.
  • Jupyter Notebook / Colab: Run Python-based ML models with small datasets.
  • Scratch + AI Extensions: Beginner-friendly ML projects for kids and students.
  • Excel or Google Sheets: Visualize data patterns and simple predictions.

Step-by-Step Beginner Activity

  1. Collect a small dataset (e.g., hours studied vs. test scores).
  2. Plot the data in a graph to see patterns.
  3. Make a manual prediction for a new data point.
  4. Compare with a simple ML tool (Teachable Machine, Python, or spreadsheet).
  5. Observe how AI improves predictions with more data points.

Exercises

  1. Predict the outcome of a simple dataset (grades, sales, or weather).
  2. Group 10–15 items into categories without labels (unsupervised practice).
  3. Test a reinforcement example: simulate points in a simple game and identify optimal actions.
  4. Use Google Teachable Machine to train a small ML model and test predictions.

Summary & Key Takeaways

  • Machine Learning is how AI learns from data to make predictions.
  • Workflow: Data → Patterns → Predictions.
  • Types of learning: Supervised, Unsupervised, Reinforcement.
  • Hands-on experiments help beginners visualize and understand AI learning.
  • ML is the foundation for LLMs, making them capable of text understanding and generation.
October 19, 2025
AI in Daily Life

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