A lot of work shows that quantum computing can speed up supervised and unsupervised learning algorithms
even improving the performance of these algorithms. Usually the following methods are used: based on quantum theory
it encodes classical information into quantum state
and then represents all of samples in dataset by one or several quantum states; It quantifies the similarity of two samples by measuring the distance between the quantum states through a quantum algorithm. The theoretical and simulation results show that quantum computation can accelerate classical machine learning algorithms. Finally
it summarizes the advantages of quantum machine learning technology and the existing problems
and looks forward to the future development trend of this field.
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references
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