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fsrs_test.go
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fsrs_test.go
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package fsrs
import (
"math"
"reflect"
"testing"
"time"
)
var testWeights = Weights{
0.4197,
1.1869,
3.0412,
15.2441,
7.1434,
0.6477,
1.0007,
0.0674,
1.6597,
0.1712,
1.1178,
2.0225,
0.0904,
0.3025,
2.1214,
0.2498,
2.9466,
0.4891,
0.6468,
}
func roundFloat(val float64, precision uint) float64 {
ratio := math.Pow(10, float64(precision))
return math.Round(val*ratio) / ratio
}
func TestBasicSchedulerExample(t *testing.T) {
p := DefaultParam()
p.W = testWeights
fsrs := NewFSRS(p)
card := NewCard()
now := time.Date(2022, 11, 29, 12, 30, 0, 0, time.UTC)
var ivlList []uint64
var stateList []State
schedulingCards := fsrs.Repeat(card, now)
var ratings = []Rating{Good, Good, Good, Good, Good, Good, Again, Again, Good, Good, Good, Good, Good}
var rating Rating
var revlog ReviewLog
for i := 0; i < len(ratings); i++ {
rating = ratings[i]
card = schedulingCards[rating].Card
ivlList = append(ivlList, card.ScheduledDays)
revlog = schedulingCards[rating].ReviewLog
stateList = append(stateList, revlog.State)
now = card.Due
schedulingCards = fsrs.Repeat(card, now)
}
wantIvlList := []uint64{0, 4, 17, 62, 198, 563, 0, 0, 9, 27, 74, 190, 457}
if !reflect.DeepEqual(ivlList, wantIvlList) {
t.Errorf("excepted:%v, got:%v", wantIvlList, ivlList)
}
wantStateList := []State{New, Learning, Review, Review, Review, Review, Review, Relearning, Relearning, Review, Review, Review, Review}
if !reflect.DeepEqual(stateList, wantStateList) {
t.Errorf("excepted:%v, got:%v", wantStateList, stateList)
}
}
func TestBasicSchedulerMemoState(t *testing.T) {
p := DefaultParam()
p.W = testWeights
fsrs := NewFSRS(p)
card := NewCard()
now := time.Date(2022, 11, 29, 12, 30, 0, 0, time.UTC)
schedulingCards := fsrs.Repeat(card, now)
var ratings = []Rating{Again, Good, Good, Good, Good, Good}
var ivlList = []uint64{0, 0, 1, 3, 8, 21}
var rating Rating
for i := 0; i < len(ratings); i++ {
rating = ratings[i]
card = schedulingCards[rating].Card
now = now.Add(time.Duration(ivlList[i]) * 24 * time.Hour)
schedulingCards = fsrs.Repeat(card, now)
}
wantStability := 71.4554
cardStability := roundFloat(schedulingCards[Good].Card.Stability, 4)
wantDifficulty := 5.0976
cardDifficulty := roundFloat(schedulingCards[Good].Card.Difficulty, 4)
if !reflect.DeepEqual(wantStability, cardStability) {
t.Errorf("excepted:%v, got:%v", wantStability, cardStability)
}
if !reflect.DeepEqual(wantDifficulty, cardDifficulty) {
t.Errorf("excepted:%v, got:%v", wantDifficulty, cardDifficulty)
}
}
func TestNextInterval(t *testing.T) {
p := DefaultParam()
fsrs := NewFSRS(p)
var ivlList []float64
for i := 1; i <= 10; i++ {
fsrs.RequestRetention = float64(i) / 10
ivlList = append(ivlList, fsrs.nextInterval(1, 0))
}
wantIvlList := []float64{422, 102, 43, 22, 13, 8, 4, 2, 1, 1}
if !reflect.DeepEqual(ivlList, wantIvlList) {
t.Errorf("excepted:%v, got:%v", wantIvlList, ivlList)
}
}
func TestLongTermScheduler(t *testing.T) {
p := DefaultParam()
p.W = testWeights
p.EnableShortTerm = false
fsrs := NewFSRS(p)
card := NewCard()
now := time.Date(2022, 11, 29, 12, 30, 0, 0, time.UTC)
ratings := []Rating{Good, Good, Good, Good, Good, Good, Again, Again, Good, Good, Good, Good, Good}
ivlHistory := []uint64{}
sHisotry := []float64{}
dHistory := []float64{}
for _, rating := range ratings {
record := fsrs.Repeat(card, now)[rating]
next := fsrs.Next(card, now, rating)
if !reflect.DeepEqual(record.Card, next.Card) {
t.Errorf("excepted:%v, got:%v", record.Card, next.Card)
}
card = record.Card
ivlHistory = append(ivlHistory, (card.ScheduledDays))
sHisotry = append(sHisotry, roundFloat(card.Stability, 4))
dHistory = append(dHistory, roundFloat(card.Difficulty, 4))
now = card.Due
}
wantIvlHistory := []uint64{3, 13, 48, 155, 445, 1158, 17, 3, 9, 27, 74, 190, 457}
if !reflect.DeepEqual(ivlHistory, wantIvlHistory) {
t.Errorf("excepted:%v, got:%v", wantIvlHistory, ivlHistory)
}
wantSHistory := []float64{3.0412, 13.0913, 48.1585, 154.9373, 445.0556, 1158.0778, 16.6306, 2.9888, 9.4633, 26.9474, 73.9723, 189.7037, 457.4379}
if !reflect.DeepEqual(sHisotry, wantSHistory) {
t.Errorf("excepted:%v, got:%v", wantSHistory, sHisotry)
}
wantDHistory := []float64{4.4909, 4.2666, 4.0575, 3.8624, 3.6804, 3.5108, 5.219, 6.8122, 6.4314, 6.0763, 5.7452, 5.4363, 5.1483}
if !reflect.DeepEqual(dHistory, wantDHistory) {
t.Errorf("excepted:%v, got:%v", wantDHistory, dHistory)
}
}
func TestGetRetrievability(t *testing.T) {
retrievabilityList := []float64{}
fsrs := NewFSRS(DefaultParam())
card := NewCard()
now := time.Date(2022, 11, 29, 12, 30, 0, 0, time.UTC)
retrievabilityList = append(retrievabilityList, roundFloat(fsrs.GetRetrievability(card, now), 4))
for i := 0; i < 3; i++ {
card = fsrs.Next(card, now, Good).Card
now = card.Due
retrievabilityList = append(retrievabilityList, roundFloat(fsrs.GetRetrievability(card, now), 4))
}
wantRetrievabilityList := []float64{0, 0.9997, 0.9036, 0.9017}
if !reflect.DeepEqual(retrievabilityList, wantRetrievabilityList) {
t.Errorf("excepted:%v, got:%v", wantRetrievabilityList, retrievabilityList)
}
}