Clusters train descriptors

centers = trainer.cluster()
centers = trainer.cluster(descs)

Input

• descs Descriptors to cluster. Each row of the descriptors matrix is a descriptor. Descriptors are not added to the inner train descriptor set.

Output

• centers Row vectors of vocabulary descriptors.

The vocabulary consists of cluster centers. So, this method returns the vocabulary. In the first variant of the method, train descriptors stored in the object are clustered. In the second variant, input descriptors are clustered.