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Ensemble methods are powerful techniques in artificial intelligence and machine learning that combine multiple models to improve the overall performance of predictive systems. Instead of relying on a single learning algorithm, ensemble methods integrate several models to produce better accuracy, robustness, and generalization. The basic idea behind ensemble learning is that a group of weak learners can come together to form a strong learner. A weak learner is a model that performs slightly better than random guessing, while a strong learner achieves high predictive performance. Ensemble methods reduce variance, bias, or improve predictions by aggregating the outputs of multiple models. They are widely used in both classification and regression tasks. One of the most common ensemble methods is bagging, also known as Bootstrap Aggregating. Bagging aims to reduce variance and improve stability by training multiple models on different subsets of the training data. These subsets are generated using bootstrap sampling, where samples are drawn randomly with replacement from the original dataset. Each model is trained independently using its own subset of data. After training, the predictions from all models are combined, usually through majority voting for classification tasks or averaging for regression tasks. Bagging is particularly useful for models that are sensitive to fluctuations in the training data, such as decision trees. By averaging the predictions of many trees, bagging reduces the risk of overfitting and improves generalization. A popular implementation of bagging is the Random Forest algorithm. Random Forest constructs a large number of decision trees during training and combines their outputs to make final predictions. In addition to using bootstrap sampling, Random Forest also introduces randomness in feature selection. At each split in a decision tree, only a random subset of features is considered instead of _____ ______ _____ ________ __________.
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