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From the Latin sparsus, meaning âscattered,â we get the adjective sparse, which means âfew and scattered.â Thinning hair is sparse, as is the population of an endangered species. Or a small and scattered crowd for an unpopular band. Synonyms include dispersed, infrequent, and scanty.
Sparse dictionary learning. Sparse dictionary learning is a representation learning method which aims at finding a sparse representation of the input data (also known as sparse coding) in the form of a linear combination of basic elements as well as those basic elements themselves. These elements are called atoms and they compose a dictionary.