forked from cerc-io/ipld-eth-server
131 lines
3.8 KiB
Go
131 lines
3.8 KiB
Go
// CookieJar - A contestant's algorithm toolbox
|
|
// Copyright (c) 2014 Peter Szilagyi. All rights reserved.
|
|
//
|
|
// CookieJar is dual licensed: use of this source code is governed by a BSD
|
|
// license that can be found in the LICENSE file. Alternatively, the CookieJar
|
|
// toolbox may be used in accordance with the terms and conditions contained
|
|
// in a signed written agreement between you and the author(s).
|
|
|
|
// Package utility implements a reasoner AI based on utility theory.
|
|
package utility
|
|
|
|
import "fmt"
|
|
|
|
// Utility theory based AI system configuration.
|
|
type Config struct {
|
|
Input []InputConf
|
|
Combo []ComboConf
|
|
}
|
|
|
|
// Configuration for input based utility curve(s).
|
|
type InputConf struct {
|
|
Id int // A referable identifier for the utility
|
|
Min float64 // Interval start for normalization
|
|
Max float64 // Interval end for normalization
|
|
Set bool // Flag whether the config defines a set of utilities
|
|
NonZero bool // Flag whether the curve is allowed absolute zero output
|
|
Curve Curve // Function mapping the data to a curve
|
|
}
|
|
|
|
// Configuration for combination based utility curve(s).
|
|
type ComboConf struct {
|
|
Id int // A referable identifier for the utility
|
|
SrcA int // First input source of the combinator
|
|
SrcB int // Second input source of the combinator
|
|
Set bool // Flag whether the config defines a set of utilities
|
|
Comb Combinator // Function combining the input sources
|
|
}
|
|
|
|
// Utility theory based decision making system.
|
|
type System struct {
|
|
utils map[int]utility
|
|
}
|
|
|
|
// Creates a utility theory AI system.
|
|
func New(config *Config) *System {
|
|
sys := &System{
|
|
utils: make(map[int]utility),
|
|
}
|
|
for _, input := range config.Input {
|
|
sys.addInput(&input)
|
|
}
|
|
for _, combo := range config.Combo {
|
|
sys.addCombo(&combo)
|
|
}
|
|
return sys
|
|
}
|
|
|
|
// Injects a new input based utility curve (set) into the system.
|
|
func (s *System) addInput(config *InputConf) {
|
|
if config.Set {
|
|
// A set of utilities is needed
|
|
utils := newInputSetUtility(config.Curve, config.NonZero)
|
|
utils.Limit(config.Min, config.Max)
|
|
s.utils[config.Id] = utils
|
|
} else {
|
|
// Singleton input utility, insert as is
|
|
util := newInputUtility(config.Curve, config.NonZero)
|
|
util.Limit(config.Min, config.Max)
|
|
s.utils[config.Id] = util
|
|
}
|
|
}
|
|
|
|
// Injects a new combinatorial utility curve set into the system.
|
|
func (s *System) addCombo(config *ComboConf) {
|
|
if config.Set {
|
|
// A set of utilities is needed
|
|
srcA := s.utils[config.SrcA]
|
|
srcB := s.utils[config.SrcB]
|
|
s.utils[config.Id] = newComboSetUtility(config.Comb, srcA, srcB)
|
|
} else {
|
|
// Singleton combo utility, insert as is
|
|
srcA := s.utils[config.SrcA]
|
|
srcB := s.utils[config.SrcB]
|
|
|
|
util := newComboUtility(config.Comb)
|
|
util.Init(srcA, srcB)
|
|
|
|
s.utils[config.Id] = util
|
|
}
|
|
}
|
|
|
|
// Sets the normalization limits for data a utility.
|
|
func (s *System) Limit(id int, min, max float64) {
|
|
switch util := s.utils[id].(type) {
|
|
case *inputUtility:
|
|
util.Limit(min, max)
|
|
case *inputSetUtility:
|
|
util.Limit(min, max)
|
|
default:
|
|
panic(fmt.Sprintf("Unknown utility type: %+v", util))
|
|
}
|
|
}
|
|
|
|
// Updates the input of a data utility.
|
|
func (s *System) Update(id int, input float64) {
|
|
s.utils[id].(*inputUtility).Update(input)
|
|
}
|
|
|
|
// Updates the input of a member of a data utility set.
|
|
func (s *System) UpdateOne(id, index int, input float64) {
|
|
s.utils[id].(*inputSetUtility).Update(index, input)
|
|
}
|
|
|
|
// Updates the input of all the members of a data utility set.
|
|
func (s *System) UpdateAll(id int, inputs []float64) {
|
|
util := s.utils[id].(*inputSetUtility)
|
|
for i, input := range inputs {
|
|
util.Update(i, input)
|
|
}
|
|
}
|
|
|
|
// Evaluates a singleton utility.
|
|
func (s *System) Evaluate(id int) float64 {
|
|
return s.utils[id].(singleUtility).Evaluate()
|
|
}
|
|
|
|
// Evaluates a member of a utility set.
|
|
func (s *System) EvaluateOne(id, index int) float64 {
|
|
return s.utils[id].(multiUtility).Evaluate(index)
|
|
}
|