github.com/weaviate/weaviate@v1.24.6/modules/ref2vec-centroid/vectorizer/method_mean.go (about)

     1  //                           _       _
     2  // __      _____  __ ___   ___  __ _| |_ ___
     3  // \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
     4  //  \ V  V /  __/ (_| |\ V /| | (_| | ||  __/
     5  //   \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
     6  //
     7  //  Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
     8  //
     9  //  CONTACT: hello@weaviate.io
    10  //
    11  
    12  package vectorizer
    13  
    14  import "fmt"
    15  
    16  func calculateMean(refVecs ...[]float32) ([]float32, error) {
    17  	if len(refVecs) == 0 || len(refVecs[0]) == 0 {
    18  		return nil, nil
    19  	}
    20  
    21  	targetVecLen := len(refVecs[0])
    22  	meanVec := make([]float32, targetVecLen)
    23  
    24  	// TODO: is there a more efficient way of doing this?
    25  	for _, vec := range refVecs {
    26  		if len(vec) != targetVecLen {
    27  			return nil, fmt.Errorf("calculate mean: found vectors of different length: %d and %d",
    28  				targetVecLen, len(vec))
    29  		}
    30  
    31  		for i, val := range vec {
    32  			meanVec[i] += val
    33  		}
    34  	}
    35  
    36  	for i := range meanVec {
    37  		meanVec[i] /= float32(len(refVecs))
    38  	}
    39  
    40  	return meanVec, nil
    41  }