
The process of adjusting a model's parameters to minimize error on a dataset.Training is the core process in machine learning where a model's internal parameters are iteratively adjusted to minimize the difference between its predictions and the actual outcomes in a dataset. This is achieved by feeding the model examples, comparing its output to the known correct answer, and updating the parameters to reduce the error. The goal is for the model to learn patterns from the data so it can make accurate predictions on new, unseen data.
The concept of training neural networks by adjusting weights dates back to the 1950s with Frank Rosenblatt's perceptron, but the modern backpropagation algorithm, which made training multi-layer networks practical, was popularized in the 1980s by David Rumelhart, Geoffrey Hinton, and Ronald Williams.
Training typically involves an optimization algorithm, such as gradient descent. The model makes a prediction, a loss function quantifies how wrong it is, and the algorithm calculates the gradient of that loss with respect to each parameter. The parameters are then adjusted in the direction that reduces the loss, and this process is repeated over many iterations (epochs) until the loss converges to a minimum. The choice of architecture, data quality, and hyperparameters like learning rate all influence how effectively the model learns.
Training is used everywhere in modern technology: from training neural networks to predict material properties in computational chemistry, to teaching AI models to interpret medical images, to fine-tuning large language models that generate human-like text.
Some neural network models are so complex that training them can consume as much electricity as a small town, and the process often requires specialized hardware like GPUs or TPUs to complete in a reasonable time.






















