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yml_test.go
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yml_test.go
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package bbn
import (
"fmt"
"testing"
"github.com/stretchr/testify/assert"
)
func TestFromYaml(t *testing.T) {
yml := `name: Umbrella Decision Network
variables:
- variable: Weather
position: [16, 0]
outcomes: [Sunny, Rainy]
table:
- [70, 30]
- variable: Forecast
position: [1, 8]
given: [Weather]
outcomes: [Sunny, Cloudy, Rainy]
table:
- [70, 20, 10] # Sunny
- [15, 25, 60] # Rainy
- variable: Umbrella
position: [16, 16]
given: [Forecast]
type: decision
outcomes: [Take, Leave]
- variable: Utility
position: [31, 8]
type: utility
given: [Weather, Umbrella]
outcomes: [Expected]
table:
- [ 20] # Sunny, Take
- [100] # Sunny, Leave
- [ 70] # Rainy, Take
- [ 0] # Rainy, Leave
- variable: Logic
outcomes: [yes, no]
given: [Weather]
logic: outcome-is 1 2
`
n, err := FromYAML([]byte(yml))
assert.Nil(t, err)
policy, err := n.SolvePolicies(true)
assert.Nil(t, err)
fmt.Println(policy)
}
func TestToYAML(t *testing.T) {
rain := Variable{
Name: "Rain",
Outcomes: []string{"yes", "no"},
}
sprinkler := Variable{
Name: "Sprinkler",
Outcomes: []string{"yes", "no"},
}
grassWet := Variable{
Name: "GrassWet",
Outcomes: []string{"yes", "no"},
}
fRain := Factor{
For: "Rain",
Table: []float64{0.2, 0.8},
}
fSprinkler := Factor{
For: "Sprinkler",
Given: []string{"Rain"},
Table: []float64{
0.01, 0.99, // rain yes
0.2, 0.8, // rain no
},
}
fGrass := Factor{
For: "GrassWet",
Given: []string{"Rain", "Sprinkler"},
Table: []float64{
0.99, 0.01, // rain yes, sprikler yes
0.8, 0.2, // rain yes, sprikler no
0.9, 0.1, // rain no, sprikler yes
0.0, 1.0, // rain no, sprikler no
},
}
net, err := New("Sprinkler", "", []Variable{rain, sprinkler, grassWet}, []Factor{fRain, fSprinkler, fGrass})
assert.Nil(t, err)
yml, err := ToYAML(net)
assert.Nil(t, err)
expected := `name: Sprinkler
variables:
- variable: Rain
outcomes: ["yes", "no"]
position: [0, 0]
table: [[0.2, 0.8]]
- variable: Sprinkler
given: [Rain]
outcomes: ["yes", "no"]
position: [0, 0]
table: [[0.01, 0.99], [0.2, 0.8]]
- variable: GrassWet
given: [Rain, Sprinkler]
outcomes: ["yes", "no"]
position: [0, 0]
table: [[0.99, 0.01], [0.8, 0.2], [0.9, 0.1], [0, 1]]
`
assert.Equal(t, expected, string(yml))
net, err = FromYAML(yml)
assert.Nil(t, err)
evidence := map[string]string{
"Rain": "no",
"GrassWet": "yes",
}
result, _, err := net.SolveQuery(evidence, []string{"Sprinkler"}, false)
assert.Nil(t, err)
assert.Equal(t, map[string][]float64{
"Sprinkler": {1, 0},
}, result)
}