Initialize nonnegative matrices 𝑊 ( 0 ) and 𝐻 ( 0 )
WhileStopping criteria are not satisfieddo
𝐻 𝐻 ( 𝑉 𝐻 ) ( 𝑊 𝐻 𝐻 )
𝑊 𝑊 ( ( 𝑉 𝐻 ) ( 𝑊 𝑊 𝑉 𝐻 ) ) ( 1 / 2 )
end while
{ and denotes the Hadamard product and the element-wise division,
respectively and ( ) ( 1 / 2 ) denotes the element-wise square root operation}
Algorithm 2: NMF with orthogonal constraint on 𝑊 .