"Maximizing Learning Efficiency with Active Learning"

Active Learning in Machine Learning

Active Learning is a type of machine learning where the algorithm is able to select which data it wants to learn from. In traditional machine learning, the algorithm is given a set of labeled data and it learns from that data. However, in active learning, the algorithm is able to ask for more data to learn from.

Active learning is needed when there is a limited amount of labeled data available. In many cases, labeling data can be time-consuming and expensive. Active learning allows the algorithm to learn from a smaller amount of labeled data by selecting the most informative data points to learn from.

Active learning should be used when the cost of labeling data is high, when there is a limited amount of labeled data available, or when the algorithm needs to be updated frequently.

There are several algorithms for active learning, including:

• Uncertainty Sampling: This algorithm selects the data points that the algorithm is most uncertain about. This means that the algorithm selects the data points that it is least confident in its predictions.
• Query by Committee: This algorithm selects the data points that have the most disagreement among a committee of models. The committee is made up of multiple models that have been trained on the same data.
• Expected Model Change: This algorithm selects the data points that are expected to have the most impact on the model's performance. This is done by measuring the expected change in the model's performance if a particular data point is added to the training set.