extraZddTrunc.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "misc/st/st.h"
#include "bdd/cudd/cuddInt.h"

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Classes
struct	Vec_Int_t_

Macros
#define	TEST_VAR_MAX   10
#define	TEST_SET_MAX   10

Typedefs
typedef struct Vec_Int_t_	Vec_Int_t

Functions
void	Extra_zddTruncate_rec (DdManager *dd, DdNode *zFunc, double *pVarProbs, double ProbLimit, double ProbThis, Vec_Int_t *vSubset, Vec_Int_t *vResult)
int *	Extra_zddTruncate (DdManager *dd, DdNode *zFunc, double *pVarProbs, double ProbLimit)
DdNode *	Extra_zddVariable (DdManager *dd, int iVar)
DdNode *	Extra_zddCreateSubsets (DdManager *dd, int pSubsets[][TEST_VAR_MAX+1], int nSubsets)
void	Extra_zddPrintSubsets (int *pSubsets)
void	Extra_zddTruncateTest ()

Macro Definition Documentation

TEST_SET_MAX

#define TEST_SET_MAX   10

Definition at line 35 of file extraZddTrunc.c.

TEST_VAR_MAX

#define TEST_VAR_MAX   10

CFile****************************************************************

FileName [extraZddTrunc.c]

PackageName [extra]

Synopsis [Procedure to truncate a ZDD using variable probabilities.]

Author [Alan Mishchenko]

Affiliation [UC Berkeley]

Date [Ver. 2.0. Started - September 1, 2003.]

Revision [

Id

extraZddTrunc.c,v 1.0 2003/05/21 18:03:50 alanmi Exp

]

Definition at line 34 of file extraZddTrunc.c.

Typedef Documentation

Vec_Int_t

typedef struct Vec_Int_t_ Vec_Int_t

AutomaticStart

Definition at line 66 of file extraZddTrunc.c.

Function Documentation

Extra_zddCreateSubsets()

DdNode * Extra_zddCreateSubsets	(	DdManager *	dd,
		int	pSubsets[][TEST_VAR_MAX+1],
		int	nSubsets )

Function********************************************************************

Synopsis [Creates ZDD representing a given set of subsets.]

Description []

SideEffects []

SeeAlso []

Definition at line 241 of file extraZddTrunc.c.

{
    int i, k;
    DdNode * zOne, * zVar, * zRes, * zTemp;
    zRes = Cudd_ReadZero(dd); Cudd_Ref( zRes );
    for ( i = 0; i < nSubsets; i++ )
    {
        zOne = Cudd_ReadOne(dd); Cudd_Ref( zOne );
        for ( k = 0; pSubsets[i][k] != -1; k++ )
        {
            assert( pSubsets[i][k] < TEST_VAR_MAX );
            zVar = Extra_zddVariable( dd, pSubsets[i][k] );
            zOne = Cudd_zddUnateProduct( dd, zTemp = zOne, zVar ); Cudd_Ref( zOne );
            Cudd_RecursiveDerefZdd( dd, zTemp );
        }
        zRes = Cudd_zddUnion( dd, zRes, zOne ); Cudd_Ref( zRes );
        Cudd_RecursiveDerefZdd( dd, zOne );
    }
    Cudd_Deref( zRes );
    return zRes;
}

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Extra_zddPrintSubsets()

void Extra_zddPrintSubsets

(

int *

pSubsets

)

Function********************************************************************

Synopsis [Prints a set of subsets represented using as an array.]

Description []

SideEffects []

SeeAlso []

Definition at line 277 of file extraZddTrunc.c.

{
    int i, k, Counter = 0;
    printf( "The set contains %d subsets:\n", pSubsets[0] );
    for ( i = k = 0; i < pSubsets[0]; i++ )
    {
        printf( "Subset %3d : {", Counter );
        for ( k++; pSubsets[k] != -1; k++ )
            printf( " %d", pSubsets[k] );
        printf( " }\n" );
        Counter++;
    }
}

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Extra_zddTruncate()

int * Extra_zddTruncate	(	DdManager *	dd,
		DdNode *	zFunc,
		double *	pVarProbs,
		double	ProbLimit )

Definition at line 185 of file extraZddTrunc.c.

{
    Vec_Int_t * vSubset, * vResult;
    int i, sizeZ = Cudd_ReadZddSize(dd);
    int * pResult;
    // check that probabilities are reasonable
    assert( ProbLimit > 0 && ProbLimit <= 1 );
    for ( i = 0; i < sizeZ; i++ )
        assert( pVarProbs[i] > 0 && pVarProbs[i] <= 1 );
    // enumerate assignments satisfying the probability limit
    vSubset = Vec_IntAlloc( sizeZ );
    vResult = Vec_IntAlloc( 10 * sizeZ );
    Vec_IntPush( vResult, 0 );
    Extra_zddTruncate_rec( dd, zFunc, pVarProbs, ProbLimit, 1, vSubset, vResult );
    Vec_IntFree( vSubset );
    pResult = Vec_IntReleaseArray( vResult );
    Vec_IntFree( vResult );
    return pResult;
} // end of Extra_zddTruncate 

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Extra_zddTruncate_rec()

void Extra_zddTruncate_rec	(	DdManager *	dd,
		DdNode *	zFunc,
		double *	pVarProbs,
		double	ProbLimit,
		double	ProbThis,
		Vec_Int_t *	vSubset,
		Vec_Int_t *	vResult )

AutomaticEnd Function********************************************************************

Synopsis [Compute the set of subsets whose probability is more than ProbLimit.]

Description [The resulting array has the following form: The first integer entry is the number of resulting subsets. The following integer entries in the array contain as many subsets. Each subset is an array of integers followed by -1. See how subsets are printed in the included test procedure below.]

SideEffects []

SeeAlso []

Definition at line 155 of file extraZddTrunc.c.

{
    // quit if probability of the path is less then the limit
    if ( ProbThis < ProbLimit )
        return;
    // quit if there is no subsets
    if ( zFunc == Cudd_ReadZero(dd) ) 
        return;
    // quit and save a new subset if there is one
    if ( zFunc == Cudd_ReadOne(dd) ) 
    {
        Vec_IntAddToEntry( vResult, 0, 1 );
        Vec_IntAppend( vResult, vSubset );
        Vec_IntPush( vResult, -1 );
        return;
    }
    // call recursively for the set without the given variable
    Extra_zddTruncate_rec( dd, cuddE(zFunc), pVarProbs, ProbLimit, ProbThis, vSubset, vResult );
    // call recursively for the set with the given variable
    Vec_IntPush( vSubset, Cudd_NodeReadIndex(zFunc) );
    Extra_zddTruncate_rec( dd, cuddT(zFunc), pVarProbs, ProbLimit, ProbThis * pVarProbs[Cudd_NodeReadIndex(zFunc)], vSubset, vResult );
    Vec_IntPop( vSubset );
}

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Extra_zddTruncateTest()

void Extra_zddTruncateTest

(

)

Function********************************************************************

Synopsis [Testbench for the above truncation procedure.]

Description []

SideEffects []

SeeAlso []

Definition at line 302 of file extraZddTrunc.c.

{
    // input data
    int nSubsets = 5;
    int pSubsets[TEST_SET_MAX][TEST_VAR_MAX+1] = { {0, 3, 5, -1}, {1, 2, 3, 6, 9, -1}, {1, 5, 7, 8, -1}, {2, 4, -1}, {0, 5, 6, 9, -1} };
    // varible probabilities
    double pVarProbs[TEST_VAR_MAX] = { 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1 };
    double ProbLimit = 0.001;
    // output data
    int * pOutput;
    // start the manager and create ZDD representing the input subsets
    DdManager * dd = Cudd_Init( 0, TEST_VAR_MAX, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS , 0 );
    DdNode * zFunc = Extra_zddCreateSubsets( dd, pSubsets, nSubsets );  Cudd_Ref( zFunc );
    assert( nSubsets <= TEST_SET_MAX );
    // print the input ZDD
    printf( "The initial ZDD representing %d subsets:\n", nSubsets );
    Cudd_zddPrintMinterm( dd, zFunc );
    // compute the result of truncation
    pOutput = Extra_zddTruncate( dd, zFunc, pVarProbs, ProbLimit );
    // print the resulting ZDD
    printf( "The resulting ZDD representing %d subsets:\n", pOutput[0] );
    // print the resulting subsets
    Extra_zddPrintSubsets( pOutput );
    // cleanup
    ABC_FREE( pOutput );
    Cudd_RecursiveDerefZdd( dd, zFunc );
    Cudd_Quit( dd );
} 

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Extra_zddVariable()

DdNode * Extra_zddVariable	(	DdManager *	dd,
		int	iVar )

Function*************************************************************

Synopsis [Creates the combination composed of a single ZDD variable.]

Description []

SideEffects []

SeeAlso []

Definition at line 220 of file extraZddTrunc.c.

{
    DdNode * zRes;
    do {
        dd->reordered = 0;
        zRes = cuddZddGetNode( dd, iVar, Cudd_ReadOne(dd), Cudd_ReadZero(dd) ); 
    } while (dd->reordered == 1);
    return zRes;
}

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