The correct answer is: B. Semi-supervised learning.
Semi-supervised learning is a type of machine learning that uses both labeled and unlabeled data to train a model. This is in contrast to supervised learning, which only uses labeled data, and unsupervised learning, which only uses unlabeled data.
Semi-supervised learning can be adopted when it’s necessary to categorize a large amount of data with a few complete examples or when there’s the need to impose some constraints to a clustering algorithm.
For example, let’s say you want to train a model to classify images of cats and dogs. You could collect a large dataset of images, manually label some of them as cats and dogs, and then train the model on the labeled data. However, this would be a very time-consuming and expensive process.
Instead, you could use semi-supervised learning. You could collect a large dataset of images, manually label a small subset of them as cats and dogs, and then train the model on both the labeled and unlabeled data. This would be much faster and cheaper than manually labeling all of the data.
Semi-supervised learning can also be used to impose some constraints on a clustering algorithm. For example, let’s say you want to cluster a dataset of images into groups of similar images. You could use a clustering algorithm to cluster the data, but the results might not be very good. This is because clustering algorithms often produce clusters that are not very meaningful.
To improve the results, you could use semi-supervised learning. You could collect a small subset of images that you know belong to different clusters, and then train a model on both the labeled and unlabeled data. This would help the model to learn the meaning of the clusters and to produce better results.
Semi-supervised learning is a powerful tool that can be used to improve the performance of machine learning models. It is especially useful when there is a large amount of unlabeled data available.