complete lu for matrix
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@ -35,7 +35,10 @@ public class RealTensorAlgebra : TensorPartialDivisionAlgebra<Double, RealTensor
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}
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override fun zeroesLike(other: RealTensor): RealTensor {
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TODO("Not yet implemented")
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// TODO refactor very bad!!!
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val shape = other.shape
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val buffer = DoubleArray(other.buffer.size) { 0.0 }
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return RealTensor(shape, buffer)
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}
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override fun ones(shape: IntArray): RealTensor {
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@ -340,9 +343,30 @@ public class RealTensorAlgebra : TensorPartialDivisionAlgebra<Double, RealTensor
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return Pair(lu, IntTensor(intArrayOf(m), pivot))
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}
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override fun luUnpack(A_LU: RealTensor, pivots: IntTensor): Triple<RealTensor, RealTensor, RealTensor> {
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override fun luUnpack(lu: RealTensor, pivots: IntTensor): Triple<RealTensor, RealTensor, RealTensor> {
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// todo checks
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val n = lu.shape[0]
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val p = zeroesLike(lu)
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pivots.buffer.array.forEachIndexed { i, pivot ->
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p[i, pivot] = 1.0
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}
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val l = zeroesLike(lu)
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val u = zeroesLike(lu)
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for (i in 0 until n){
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for (j in 0 until n){
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if (i == j) {
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l[i, j] = 1.0
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}
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if (j < i) {
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l[i, j] = lu[i, j]
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}
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if (j >= i) {
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u[i, j] = lu[i, j]
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}
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}
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}
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return Triple(p, l, u)
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}
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override fun RealTensor.svd(): Triple<RealTensor, RealTensor, RealTensor> {
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