Update the weight matrix and the matrix product #175
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There is no need to calculate the distance in a quadratic form by generating the diagonal matrix intermediately. Just arranging the weights as a vector and calculating the linear combination solves the calculation. This also reduces the overhead of computation.
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There is no need to calculate the distance in a quadratic form by generating the diagonal matrix intermediately. Just arranging the weights as a vector and calculating the linear combination solves the calculation. This also reduces the overhead of computation because after the modification, only one matrix product need to be calculated.