Unsupervised learning is one of the main algorithms used in machine learning.
Unsupervised learning algorithms are used on datasets where output labels are not provided. Hence, instead of trying to predict a particular output for each input, these algorithms attempt to discover the underlying structure of the input data, clustering similar inputs together.
An example of a simple unsupervised learning algorithm is k-nearest neighbor clustering.
Another example of unsupervised learning which is highly applicable to radiology is generative learning. Generative learning is an unsupervised deep learning approach where unlabelled data is used to train a generative model which learns to generate data similar to that of the dataset.
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