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README
gocluster
GO implementation of clustering algorithms: kmodes and kprototypes.
Kmodes algorithm is very similar to wellknown clustering algorithm kmeans. The difference is how the distance is computed. In kmeans Euclidean distance between two vectors is most commonly used. While it works well for numerical, continuous data it is not suitable to use it with categorical data as it is impossible to compute the distance between values like ‘Europe’ and ‘Africa’. This is why in kmodes, the Hamming distance between vectors is used  it shows how many elements of two vectors is different. It is a good alternative for onehot encoding while dealing with large number of categories for one feature. Kprototypes is used to cluster mixed data (both categorical and numerical).
Implementation of algorithms is based on papers: HUANG97, HUANG98, CAO09 and partially inspired by python implementation of same algorithms: KMODES.
Installation
go get u gopkg.in/eXpertSolutions/gocluster.v1
Usage
This is basic configuration and usage of KModes and KPrototypes algorithms. For more information please refer to the documentation.
package main
import (
"fmt"
"github.com/eXpertSolutions/gocluster/cluster"
)
func main() {
//input categorical data first must be dictionaryencoded to numbers  for example for values
//"blue", "red", "green" it can be 1,2,3
data := cluster.NewDenseMatrix(lineNumber, columnNumber, rawData)
newData := cluster.NewDenseMatrix(newLineNumber, newColumnNumber, newRawData)
//input parameters for the algorithm
//distance and initialization functions may be chosen from the package or one may use
//custom functions with proper arguments
distanceFunction := cluster.WeightedHammingDistance
initializationFunction := cluster.InitCao
//number of clusters and maximum number of iterations
clustersNumber := 5
maxIteration := 20
//weight vector  used to set importance of the features, bigger number means greater
//contribution to the cost function
//vector must be of the same length as the number of features in dataset
//it is not compulsory, if 'nil' then all features are treated equally (weight = 1)
weights := []float64{1,1,2}
wvec := [][]float64{weights}
//path to file where model will be saved or loaded from using LoadModel(), SaveModel()
//if no need to load or save the model, can be set to empty string
path = "km.txt"
//KModes algorithm
//initialization
km := cluster.NewKModes(distanceFunction, initializationFunction, clustersNumber, 1,
maxIteration, wvec, "km.txt")
//training
//after training it is possible to access clusters centers vectors and computed labels
//using km.ClusterCentroids and km.Labels
err := km.FitModel(data)
if err != nil {
fmt.Println(err)
}
//predicting labels for new data
newLabels, err := km.Predict(newData)
if err != nil {
fmt.Println(err)
}
//KPrototypes algorithm
//it needs two more parameters than kmodes:
//categorical  vector with numbers indicating columns with categorical features
//gamma  float number, importance of cost contribution for numerical values
categorical := []int{1} // means that only column number one contains categorical data
gamma := 0.2 //cost from distance function for numerical data will be multiplied by 0.2
//initialization
kp := cluster.NewKPrototypes(distanceFunction, initializationFunction, categorical,
clustersNumber, 1, maxIteration, wvec, gamma, "km.txt")
//training
err := kp.FitModel(data)
if err != nil {
fmt.Println(err)
}
//predicting labels for new data
newLabelsP, err := kp.Predict(newData)
if err != nil {
fmt.Println(err)
}
}
Contributing
Contributions are greatly appreciated. The project follows the typical GitHub pull request model for contribution.
License
The sources are release under a BSD 3Clause License. The full terms of that
license can be found in LICENSE
file of this repository.
References
[HUANG97]: Huang, Z.: Clustering large data sets with mixed numeric and categorical values, Proceedings of the First Pacific Asia Knowledge Discovery and Data Mining Conference, Singapore, pp. 2134, 1997.
[HUANG98] Huang, Z.: Extensions to the kmodes algorithm for clustering large data sets with categorical values, Data Mining and Knowledge Discovery 2(3), pp. 283304, 1998.
[CAO09] Cao, F., Liang, J, Bai, L.: A new initialization method for categorical data clustering, Expert Systems with Applications 36(7), pp. 1022310228., 2009.
[KMODES] Python implementation of kmodes: https://github.com/nicodv/kmodes
*Note that all licence references and agreements mentioned in the gocluster README section above
are relevant to that project's source code only.