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internal.go
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internal.go
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// Copyright 2023 Matrix Origin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package moarray
import "gonum.org/v1/gonum/mat"
// These functions are use internally by the kmeans algorithm and vector index etc. They are not exposed externally.
// NormalizeGonumVector normalizes a vector in place.
// Note that this function is used by the kmeans algorithm. Here, if we get a zero vector, we do not normalize it and
// return it directly. This is because the zero vector is a valid vector in the kmeans algorithm.
func NormalizeGonumVector(vector *mat.VecDense) {
norm := mat.Norm(vector, 2)
if norm != 0 {
vector.ScaleVec(1/norm, vector)
}
}
func NormalizeGonumVectors(vectors []*mat.VecDense) {
for i := range vectors {
NormalizeGonumVector(vectors[i])
}
}
//// NormalizeMoVecf64 is used only in test functions.
//func NormalizeMoVecf64(vector []float64) []float64 {
// res := ToGonumVector[float64](vector)
// //NormalizeGonumVector(res)
// return ToMoArray[float64](res)
//}