Machine Learning

Overview

Machine learning is the foundational paradigm beneath modern artificial intelligence, spanning everything from classical statistical algorithms to today's vast neural networks. Its defining idea is a reversal of traditional programming: instead of a developer writing explicit rules for every case, the system is shown examples and works out the patterns for itself, improving through experience. This makes it suited to problems too messy or too subtle to capture in hand-written logic, where the rules are easier to demonstrate than to articulate, recognising a face, flagging fraud, forecasting demand.

How it works

Three ingredients recur across nearly every machine learning system. There is a model, a mathematical function with adjustable parameters that maps inputs to outputs. There is a dataset, the collection of examples the system learns from. And there is a training process, an optimisation algorithm that tunes the parameters step by step to make the model's outputs better match the desired ones. Feed in more representative data and train carefully, and the model's predictions on examples it has never seen before steadily improve. That ability to generalise is the whole point.