exprinterpret_cppad.cpp File Reference

Detailed Description

methods to interpret (evaluate) an expression "fast" using CppAD

Author

Stefan Vigerske

Definition in file exprinterpret_cppad.cpp.

#include "scip/exprinterpret.h"
#include "scip/def.h"
#include "scip/intervalarith.h"
#include "scip/pub_expr.h"
#include "scip/scip_expr.h"
#include "scip/expr_pow.h"
#include "scip/expr_exp.h"
#include "scip/expr_log.h"
#include "scip/expr_varidx.h"
#include <cmath>
#include <cstring>
#include <algorithm>
#include <vector>
#include <cppad/cppad.hpp>
#include <cppad/utility/error_handler.hpp>

Go to the source code of this file.

Data Structures
class	atomic_userexpr

Macros
#define	NO_CPPAD_USER_ATOMIC
#define	CPPAD_MAX_NUM_THREADS   1

Functions
template<class Type >
void	posintpower (const vector< Type > &in, vector< Type > &out, size_t exponent)
template<class Type >
static void	evalSignPower (CppAD::AD< Type > &resultant, const CppAD::AD< Type > &arg, SCIP_EXPR *expr)
template<class Type >
static void	evalIntPower (Type &resultant, const Type &arg, const int exponent)
template<class Type >
static SCIP_RETCODE	eval (SCIP *scip, SCIP_EXPR *expr, SCIP_EXPRINTDATA *exprintdata, const vector< Type > &x, Type &val)
static void	cppaderrorcallback (bool known, int line, const char *file, const char *cond, const char *msg)
static CppAD::ErrorHandler	errorhandler (cppaderrorcallback)
const char *	SCIPexprintGetName (void)
const char *	SCIPexprintGetDesc (void)
SCIP_EXPRINTCAPABILITY	SCIPexprintGetCapability (void)
SCIP_RETCODE	SCIPexprintCreate (SCIP *scip, SCIP_EXPRINT **exprint)
SCIP_RETCODE	SCIPexprintFree (SCIP *scip, SCIP_EXPRINT **exprint)
SCIP_RETCODE	SCIPexprintCompile (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *rootexpr, SCIP_EXPRINTDATA **exprintdata)
SCIP_RETCODE	SCIPexprintFreeData (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *expr, SCIP_EXPRINTDATA **exprintdata)
SCIP_EXPRINTCAPABILITY	SCIPexprintGetExprCapability (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *expr, SCIP_EXPRINTDATA *exprintdata)
SCIP_RETCODE	SCIPexprintEval (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *expr, SCIP_EXPRINTDATA *exprintdata, SCIP_Real *varvals, SCIP_Real *val)
SCIP_RETCODE	SCIPexprintGrad (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *expr, SCIP_EXPRINTDATA *exprintdata, SCIP_Real *varvals, SCIP_Bool new_varvals, SCIP_Real *val, SCIP_Real *gradient)
SCIP_RETCODE	SCIPexprintHessianSparsity (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *expr, SCIP_EXPRINTDATA *exprintdata, SCIP_Real *varvals, int **rowidxs, int **colidxs, int *nnz)
SCIP_RETCODE	SCIPexprintHessian (SCIP *scip, SCIP_EXPRINT *exprint, SCIP_EXPR *expr, SCIP_EXPRINTDATA *exprintdata, SCIP_Real *varvals, SCIP_Bool new_varvals, SCIP_Real *val, int **rowidxs, int **colidxs, SCIP_Real **hessianvals, int *nnz)

Macro Definition Documentation

NO_CPPAD_USER_ATOMIC

#define NO_CPPAD_USER_ATOMIC

Definition at line 67 of file exprinterpret_cppad.cpp.

CPPAD_MAX_NUM_THREADS

#define CPPAD_MAX_NUM_THREADS   1

Definition at line 81 of file exprinterpret_cppad.cpp.

Function Documentation

posintpower()

template<class Type >

void posintpower	(	const vector< Type > &	in,
		vector< Type > &	out,
		size_t	exponent
	)

power function with natural exponents

Parameters

in	vector which first argument is base
out	vector where to store result in first argument
exponent	exponent

Definition at line 556 of file exprinterpret_cppad.cpp.

References evalSignPower(), r, REALABS, SCIP_Real, SCIPgetExponentExprPow(), and SIGN.

Referenced by evalIntPower().

evalSignPower()

template<class Type >

static void evalSignPower ( CppAD::AD< Type > &  resultant, const CppAD::AD< Type > &  arg, SCIP_EXPR *  expr  )

static

specialization of signpower evaluation for real numbers

Parameters

resultant	resultant
arg	operand
expr	expression that holds the exponent

Definition at line 840 of file exprinterpret_cppad.cpp.

References EPSISINT, SCIP_Real, and SCIPgetExponentExprPow().

Referenced by eval(), and posintpower().

evalIntPower()

template<class Type >

static void evalIntPower ( Type &  resultant, const Type &  arg, const int  exponent  )

static

integer power operation for arbitrary integer exponents

Parameters

resultant	resultant
arg	operand
exponent	exponent

Definition at line 1287 of file exprinterpret_cppad.cpp.

References posintpower().

Referenced by eval().

eval()

template<class Type >

static SCIP_RETCODE eval ( SCIP *  scip, SCIP_EXPR *  expr, SCIP_EXPRINTDATA *  exprintdata, const vector< Type > &  x, Type &  val  )

static

CppAD compatible evaluation of an expression for given arguments

Parameters

scip	SCIP data structure
expr	expression
exprintdata	interpreter data for root expression
x	values of variables
val	buffer to store expression value

Definition at line 1334 of file exprinterpret_cppad.cpp.

References EPSISINT, evalIntPower(), evalSignPower(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPexprGetChildren(), SCIPexprGetHdlr(), SCIPexprGetNChildren(), SCIPexprhdlrGetName(), SCIPfreeBufferArray, SCIPgetCoefExprProduct(), SCIPgetCoefsExprSum(), SCIPgetConstantExprSum(), SCIPgetExponentExprPow(), SCIPgetIndexExprVaridx(), SCIPgetValueExprValue(), SCIPisExprExp(), SCIPisExprLog(), SCIPisExprPower(), SCIPisExprProduct(), SCIPisExprSignpower(), SCIPisExprSum(), SCIPisExprValue(), and SCIPisExprVaridx().

Referenced by SCIPexprhdlrCreate(), SCIPexprintEval(), and SCIPincludeExprhdlr().

cppaderrorcallback()

static void cppaderrorcallback ( bool  known, int  line, const char *  file, const char *  cond, const char *  msg  )

static

replacement for CppAD's default error handler

In debug mode, CppAD gives an error when an evaluation contains a nan. We do not want to stop execution in such a case, since the calling routine should check for nan's and decide what to do. Since we cannot ignore this particular error, we ignore all.

Parameters

known	is the error from a known source?
line	line where error occured
file	file where error occured
cond	error condition
msg	error message

Definition at line 1463 of file exprinterpret_cppad.cpp.

References errorhandler(), and SCIPdebugMessage.

errorhandler()

static CppAD::ErrorHandler errorhandler ( cppaderrorcallback  )

static

Referenced by cppaderrorcallback().