8000 TensorProduct is bottleneck · Issue #21 · itsubaki/q · GitHub
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TensorProduct is bottleneck #21

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itsubaki opened this issue May 17, 2022 · 1 comment
Open

TensorProduct is bottleneck #21

itsubaki opened this issue May 17, 2022 · 1 comment
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@itsubaki itsubaki self-assigned this May 17, 2022
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itsubaki commented May 17, 2022 •
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q/math/matrix/matrix.go

Lines 326 to 349 in bbe3f8c

func (m *Matrix) TensorProduct(n *Matrix) *Matrix {
p, q := m.Dimension()
a, b := n.Dimension()
rows, cols := p*a, q*b
data := make([]complex128, rows*cols)
for i := range p {
for j := range q {
mij := m.At(i, j)
for k := range a {
for l := range b {
row, col := i*a+k, j*b+l
data[row*cols+col] = mij * n.At(k, l)
}
}
}
}
return &Matrix{
Rows: rows,
Cols: cols,
Data: data,
}
}

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