👉 In the context of artificial intelligence and machine learning, a "predictor" refers to an algorithm or model that makes predictions about future states based on existing data. These predictions are made in response to input variables (e.g., inputs to a neural network) and can be useful for tasks such as forecasting, anomaly detection, or optimization. Predictors are often trained using a technique called "training with the best possible test set" where the model is evaluated on the training set and used to make predictions