257 lines
6.4 KiB
C
257 lines
6.4 KiB
C
/*
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LPAD and CP-Logic interpreter
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Copyright (c) 2007, Fabrizio Riguzzi
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This package uses the library cudd, see http://vlsi.colorado.edu/~fabio/CUDD/
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for the relative license.
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This file contains the functions for interfacing Yap and C
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The arguments of the predicate compute_prob are parsed and translated into C data
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structures
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*/
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#include "cplint.h"
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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unsigned long dividend;
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FILE *open_file (char *filename, const char *mode);
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void reverse(char s[]);
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static int compute_prob(void);
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void createVars(array_t * vars, YAP_Term t,DdManager * mgr, array_t * bVar2mVar,int create_dot, char inames[1000][20])
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/* adds the boolean variables to the BDD and returns
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an array_t containing them (array_t is defined in the util library of glu)
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returns also the names of the variables to be used to save the ADD in dot format
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*/
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{
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YAP_Term varTerm,probTerm;
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int varIndex,nVal,i,b;
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variable v;
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char numberVar[10],numberBit[10];
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double p;
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b=0;
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while(YAP_IsPairTerm(t))
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{
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varTerm=YAP_HeadOfTerm(t);
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varIndex=YAP_IntOfTerm(YAP_HeadOfTerm(varTerm));
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varTerm=YAP_TailOfTerm(varTerm);
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nVal=YAP_IntOfTerm(YAP_HeadOfTerm(varTerm));
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varTerm=YAP_TailOfTerm(varTerm);
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probTerm=YAP_HeadOfTerm(varTerm);
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v.nVal=nVal;
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v.nBit=(int)ceil(log(nVal)/log(2));
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v.probabilities=array_alloc(double,0);
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v.booleanVars=array_alloc(DdNode *,0);
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for (i=0;i<nVal;i++)
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{
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if (create_dot)
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{
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strcpy(inames[b+i],"X");
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sprintf(numberVar,"%d",varIndex);
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strcat(inames[b+i],numberVar);
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strcat(inames[b+i],"_");
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sprintf(numberBit,"%d",i);
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strcat(inames[b+i],numberBit);
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}
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p=YAP_FloatOfTerm(YAP_HeadOfTerm(probTerm));
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array_insert(double,v.probabilities,i,p);
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probTerm=YAP_TailOfTerm(probTerm);
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array_insert(DdNode *,v.booleanVars,i,Cudd_bddIthVar(mgr,b+i));
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array_insert(int,bVar2mVar,b+i,varIndex);
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}
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Cudd_MakeTreeNode(mgr,b,nVal,MTR_FIXED);
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b=b+nVal;
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array_insert(variable,vars,varIndex,v);
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t=YAP_TailOfTerm(t);
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}
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}
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void createExpression(array_t * expression, YAP_Term t)
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/* returns the expression as an array_t of terms (cubes) starting from the prolog lists of terms
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each term is an array_t of factors obtained from a prolog list of factors
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each factor is a couple (index of variable, index of value) obtained from a prolog list containing
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two integers
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*/
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{
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YAP_Term termTerm,factorTerm;
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factor f;
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int i,j;
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array_t * term;
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i=0;
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while(YAP_IsPairTerm(t))
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{
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term=array_alloc(factor,0);
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termTerm=YAP_HeadOfTerm(t);
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j=0;
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while(YAP_IsPairTerm(termTerm))
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{
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factorTerm=YAP_HeadOfTerm(termTerm);
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f.var=YAP_IntOfTerm(YAP_HeadOfTerm(factorTerm));
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f.value=YAP_IntOfTerm(YAP_HeadOfTerm(YAP_TailOfTerm(factorTerm)));
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array_insert(factor,term,j,f);
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termTerm=YAP_TailOfTerm(termTerm);
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j++;
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}
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array_insert(array_t *,expression,i,term);
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t=YAP_TailOfTerm(t);
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i++;
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}
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}
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static int compute_prob(void)
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/* this is the function that implements the compute_prob predicate used in pp.pl
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*/
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{
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YAP_Term out,arg1,arg2,arg3,arg4;
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array_t * variables,* expression, * bVar2mVar;
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DdNode * function, * add;
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DdManager * mgr;
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int nBVar,i,j,intBits,create_dot;
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FILE * file;
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DdNode * array[1];
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char * onames[1];
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char inames[1000][20];
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char * names[1000];
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GHashTable * nodes; /* hash table that associates nodes with their probability if already
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computed, it is defined in glib */
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//Cudd_ReorderingType order;
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arg1=YAP_ARG1;
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arg2=YAP_ARG2;
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arg3=YAP_ARG3;
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arg4=YAP_ARG4;
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mgr=Cudd_Init(0,0,CUDD_UNIQUE_SLOTS,CUDD_CACHE_SLOTS,0);
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variables=array_alloc(variable,0);
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bVar2mVar=array_alloc(int,0);
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create_dot=YAP_IntOfTerm(arg4);
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createVars(variables,arg1,mgr,bVar2mVar,create_dot,inames);
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//Cudd_PrintInfo(mgr,stderr);
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/* automatic variable reordering, default method CUDD_REORDER_SIFT used */
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//printf("status %d\n",Cudd_ReorderingStatus(mgr,&order));
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//printf("order %d\n",order);
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Cudd_AutodynEnable(mgr,CUDD_REORDER_SAME);
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/* Cudd_AutodynEnable(mgr, CUDD_REORDER_RANDOM_PIVOT);
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printf("status %d\n",Cudd_ReorderingStatus(mgr,&order));
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printf("order %d\n",order);
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printf("%d",CUDD_REORDER_RANDOM_PIVOT);
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*/
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expression=array_alloc(array_t *,0);
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createExpression(expression,arg2);
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function=retFunction(mgr,expression,variables);
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/* the BDD build by retFunction is converted to an ADD (algebraic decision diagram)
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because it is easier to interpret and to print */
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add=Cudd_BddToAdd(mgr,function);
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//Cudd_PrintInfo(mgr,stderr);
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if (create_dot)
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/* if specified by the user, a dot file for the BDD is written to cpl.dot */
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{
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nBVar=array_n(bVar2mVar);
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for(i=0;i<nBVar;i++)
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names[i]=inames[i];
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array[0]=add;
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onames[0]="Out";
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file = open_file("cpl.dot", "w");
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Cudd_DumpDot(mgr,1,array,names,onames,file);
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fclose(file);
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}
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nodes=g_hash_table_new(my_hash,my_equal);
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intBits=sizeof(unsigned int)*8;
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/* dividend is a global variable used by my_hash
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it is equal to an unsigned int with binary representation 11..1 */
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dividend=1;
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for(j=1;j<intBits;j++)
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{
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dividend=(dividend<<1)+1;
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}
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out=YAP_MkFloatTerm(Prob(add,variables,bVar2mVar,nodes));
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g_hash_table_foreach (nodes,dealloc,NULL);
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g_hash_table_destroy(nodes);
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Cudd_Quit(mgr);
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array_free(variables);
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array_free(bVar2mVar);
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array_free(expression);
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return(YAP_Unify(out,arg3));
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}
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/*
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int compare(char *a, char *b)
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{
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int aval,bval;
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aval=(int) *((DdNode **)a);
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aval=(int) *((DdNode **)b);
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if (aval<bval)
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return -1;
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else
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if (aval>bval)
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return 1;
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else
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return 0;
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}
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*/
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void init_my_predicates()
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/* function required by YAP for intitializing the predicates defined by a C function*/
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{
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YAP_UserCPredicate("compute_prob",compute_prob,4);
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}
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FILE *
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open_file(char *filename, const char *mode)
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/* opens a file */
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{
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FILE *fp;
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if ((fp = fopen(filename, mode)) == NULL) {
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perror(filename);
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exit(1);
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}
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return fp;
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}
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void reverse(char s[])
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/* reverses a string */
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{
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int i,c,j;
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for (i=0,j=strlen(s)-1;i<j;i++,j--)
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{
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c=s[i];
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s[i]=s[j];
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s[j]=c;
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}
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}
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gint my_equal(gconstpointer v,gconstpointer v2)
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/* function used by GHashTable to compare two keys */
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{
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DdNode *a,*b;
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a=*(DdNode **)v;
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b=*(DdNode **)v2;
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return (a==b);
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}
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guint my_hash(gconstpointer key)
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/* function used by GHashTable to hash a key */
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{
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unsigned int h;
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h=(unsigned int)((unsigned long) *((DdNode **)key) % dividend);
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return h;
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}
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void dealloc(gpointer key,gpointer value,gpointer user_data)
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{
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free(key);
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free(value);
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}
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