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/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
#pragma once
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct Multilevel_Modularity_Clustering_struct *Multilevel_Modularity_Clustering;
struct Multilevel_Modularity_Clustering_struct {
int level;/* 0, 1, ... */
int n;
SparseMatrix A; /* n x n matrix */
SparseMatrix P;
Multilevel_Modularity_Clustering next;
Multilevel_Modularity_Clustering prev;
bool delete_top_level_A;
int *matching; /* dimension n. matching[i] is the clustering assignment of node i */
double modularity;
double deg_total; /* total edge weights, including self-edges */
double *deg;/* dimension n. deg[i] equal to the sum of edge weights connected to vertex i. I.e., sum of row i */
bool agglomerate_regardless; ///< whether to agglomerate nodes even if this
///< causes modularity reduction. This is used if
///< we want to force agglomeration so as to get
///< fewer clusters
};
enum {CLUSTERING_MODULARITY = 0, CLUSTERING_MQ};
/* find a clustering of vertices by maximize modularity
A: symmetric square matrix n x n. If real value, value will be used as edges weights, otherwise edge weights are considered as 1.
inplace: whether A can e modified. If true, A will be modified by removing diagonal.
maxcluster: used to specify the maximum number of cluster desired, e.g., maxcluster=10 means that a maximum of 10 clusters
. is desired. this may not always be realized, and modularity may be low when this is specified. Default: maxcluster = 0 (no limit)
nclusters: on output the number of clusters
assignment: dimension n. Node i is assigned to cluster "assignment[i]". 0 <= assignment < nclusters.
. If *assignment = NULL on entry, it will be allocated. Otherwise used.
modularity: achieve modularity
*/
void modularity_clustering(SparseMatrix A, bool inplace, int maxcluster,
int *nclusters, int **assignment, double *modularity);
#ifdef __cplusplus
}
#endif
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