optimizer

package
v1.3.3 Latest Latest
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 Go to latest Published: May 16, 2023 License: Apache-2.0 Imports: 21 Imported by: 0

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Index

Constants

View Source 
const (
	TrueValue  = "true"
	FalseValue = "false"

	BoolType = "bool"
	IntType  = "int"

	BoolLeConstraint     = "bool_le"
	BoolLinEqConstraint  = "bool_lin_eq"
	BoolLinLeConstraint  = "bool_lin_le"
	BoolNotEqConstraint  = "bool_not"
	ArrBoolOrConstraint  = "array_bool_or"
	IntEqConstraint      = "int_eq_reif"
	IntNotEqConstraint   = "int_ne_reif"
	IntLeConstraint      = "int_le_reif"
	SetInConstraint      = "set_in_reif"
	IntLinEqConstraint   = "int_lin_eq"
	ArrIntElemConstraint = "array_var_int_element"
	IntMaxConstraint     = "array_int_maximum"

	DefinedVarAnnotation = "is_defined_var"
	DefinesVarAnnotation = "defines_var(%s)"
	OutputVarAnnotation  = "output_var"
	OutputArrAnnotation  = "output_array([1..%d])"

	ElementSeparator = ", "
)
View Source 
const (
	MaxDataPathDepth = 4
)

Variables

This section is empty.

Functions

func GetDefinesVarAnnotation 

func GetDefinesVarAnnotation(variable string) string

Types

type Annotations 

type Annotations []string

type CPSolution 

type CPSolution map[string][]string

Represents a solution to the constraints problem - a map from variable names to their value(s) in the solution

type DataPathCSP 

type DataPathCSP struct {
	// contains filtered or unexported fields
}

The main class for producing a CSP from data-path constraints and for decoding solver's solutions

func NewDataPathCSP 

func NewDataPathCSP(problemData *datapath.DataInfo, env *datapath.Environment) *DataPathCSP

The ctor also enumerates all available (module x capabilities) and all available interfaces The generated enumerations are listed at the header of the FlatZinc model

func (*DataPathCSP) BuildFzModel 

func (dpc *DataPathCSP) BuildFzModel(pathLength int) (string, error)

This is the main method for building a FlatZinc CSP out of the data-path parameters and constraints. Returns a file name where the model was dumped

NOTE: Minimal index of FlatZinc arrays is always 1. Hence, we use 1-based modeling all over the place to avoid confusion. The only exception is with interfaces (0 means nil)

type Declares 

type Declares interface {
	Declaration() string
	GetSize() int
	GetType() string
	SetAssignment(string)
}

type FlatZincConstraint 

type FlatZincConstraint struct {
	Identifier  string
	Expressions []string
	Annotations
}

Data for a single FlatZinc constraint

type FlatZincModel 

type FlatZincModel struct {
	HeaderComments string
	ParamMap       map[string]Declares
	VarMap         map[string]Declares
	Constraints    []FlatZincConstraint
	SolveTarget    FlatZincSolveItem
}

The main class for holding a FlatZinc constraint problem

func NewFlatZincModel 

func NewFlatZincModel() *FlatZincModel

func (*FlatZincModel) AddConstraint 

func (fzw *FlatZincModel) AddConstraint(identifier string, exprs []string, annotations ...string)

func (*FlatZincModel) AddHeaderComment 

func (fzw *FlatZincModel) AddHeaderComment(commentLine string)

func (*FlatZincModel) AddParam 

func (fzw *FlatZincModel) AddParam(name, varType, assignment string)

func (*FlatZincModel) AddParamArray 

func (fzw *FlatZincModel) AddParamArray(name, varType string, size int, assignment string)

func (*FlatZincModel) AddVariable 

func (fzw *FlatZincModel) AddVariable(name, varType string, isDefined, isOutput bool)

func (*FlatZincModel) AddVariableArray 

func (fzw *FlatZincModel) AddVariableArray(name, varType string, size int, isDefined, isOutput bool)

func (*FlatZincModel) Clear 

func (fzw *FlatZincModel) Clear()

func (*FlatZincModel) Dump 

func (fzw *FlatZincModel) Dump() (string, error)

dumps a FlatZinc model to a temp file using the FlatZinc syntax, returning the file name It is the caller responsibility to delete the file

func (*FlatZincModel) GetVariableSize added in v1.0.0 

func (fzw *FlatZincModel) GetVariableSize(name string) int

func (*FlatZincModel) GetVariableType added in v1.0.0 

func (fzw *FlatZincModel) GetVariableType(name string) string

func (*FlatZincModel) ReadBestSolution 

func (fzw *FlatZincModel) ReadBestSolution(solverOutput string) (CPSolution, error)

Reading FlatZinc-solver solutions and returning the best one When a minimize/maximize goal is defined, best solution should be the last solution

func (*FlatZincModel) ReadBestSolutionFromFile 

func (fzw *FlatZincModel) ReadBestSolutionFromFile(fileName string) (CPSolution, error)

Just like ReadBestSolution() but reading the solutions from a file

func (*FlatZincModel) ReadSolutions 

func (fzw *FlatZincModel) ReadSolutions(solverOutput string) ([]CPSolution, error)

Reading FlatZinc-solver solutions and returning them as a slice of CPSolution If there can be no solution to the constraint problem (UNSAT), returns a slice with a single empty solution Otherwise, must return at least one solution, or return an error

func (*FlatZincModel) ReadSolutionsFromFile 

func (fzw *FlatZincModel) ReadSolutionsFromFile(fileName string) ([]CPSolution, error)

Just like ReadSolutions() but reading the solutions from a file

func (*FlatZincModel) SetSolveTarget 

func (fzw *FlatZincModel) SetSolveTarget(goal SolveGoal, expr string, annotations ...string)

func (*FlatZincModel) SetVariableAssignment added in v1.0.0 

func (fzw *FlatZincModel) SetVariableAssignment(name, assignment string)

type FlatZincParam 

type FlatZincParam struct {
	Name       string
	Type       string
	Size       int
	IsArray    bool // (IsArray == false) implies (Size == 1)
	Assignment string
}

Data for a single FlatZinc parameter

func (*FlatZincParam) Declaration 

func (fzp *FlatZincParam) Declaration() string

formats a parameter declaration in FlatZinc format

func (*FlatZincParam) GetSize added in v1.0.0 

func (fzp *FlatZincParam) GetSize() int

func (*FlatZincParam) GetType added in v1.0.0 

func (fzp *FlatZincParam) GetType() string

func (*FlatZincParam) SetAssignment added in v1.0.0 

func (fzp *FlatZincParam) SetAssignment(assignment string)

type FlatZincSolveItem 

type FlatZincSolveItem struct {
	Annotations
	// contains filtered or unexported fields
}

Data for a FlatZinc-model solve item

type FlatZincVariable 

type FlatZincVariable struct {
	Name       string
	Type       string
	Size       int
	IsArray    bool // (IsArray == false) implies (Size == 1)
	Assignment string
	Annotations
}

Data for a single FlatZinc variable

func (*FlatZincVariable) Declaration 

func (fzv *FlatZincVariable) Declaration() string

formats a variable declaration in FlatZinc format

func (*FlatZincVariable) GetSize added in v1.0.0 

func (fzv *FlatZincVariable) GetSize() int

func (*FlatZincVariable) GetType added in v1.0.0 

func (fzv *FlatZincVariable) GetType() string

func (*FlatZincVariable) SetAssignment added in v1.0.0 

func (fzv *FlatZincVariable) SetAssignment(assignment string)

type Optimizer 

type Optimizer struct {
	// contains filtered or unexported fields
}

func NewOptimizer 

func NewOptimizer(env *datapath.Environment, problemData *datapath.DataInfo, solverPath string, log *zerolog.Logger) *Optimizer

func (*Optimizer) Solve 

func (opt *Optimizer) Solve() (datapath.Solution, error)

The main method to call for finding a legal and optimal data path Attempts short data-paths first, and gradually increases data-path length.

type SolveGoal 

type SolveGoal int64

FlatZinc solve goal must be one of three types: satisfy, minimize, maximize 

const (
	Satisfy SolveGoal = iota
	Minimize
	Maximize
)

func (SolveGoal) String 

func (s SolveGoal) String() string

Source Files

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