Initialize nonnegative matrices 𝑊 ( 0 ) and 𝐻 ( 0 )
While  Stopping criteria are not satisfieddo
𝑊 𝑊 ( 𝑉 𝐻 ) ( 𝑊 𝐻 𝐻 )
𝐻 𝐻 ( 𝑊 𝑉 ) ( 𝑊 𝑊 𝐻 )
end while
{ and denotes the Hadamard product, that is the element-wise matrix
multiplication and the element-wise division, respectively}
Algorithm 1: The Lee and Seung multiplicative update rules (NMF).