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user_recommend.go
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user_recommend.go
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package service
import (
"fmt"
"sync"
"time"
"github.com/alibaba/pairec/v2/context"
"github.com/alibaba/pairec/v2/log"
"github.com/alibaba/pairec/v2/module"
"github.com/alibaba/pairec/v2/service/debug"
"github.com/alibaba/pairec/v2/service/feature"
"github.com/alibaba/pairec/v2/service/general_rank"
"github.com/alibaba/pairec/v2/service/hook"
"github.com/alibaba/pairec/v2/service/metrics"
"github.com/alibaba/pairec/v2/service/pipeline"
"github.com/alibaba/pairec/v2/service/rank"
)
type UserRecommendService struct {
RecommendService
recallService *RecallService
generalRankService *general_rank.GeneralRankService
rankService *rank.RankService
userFeatureService *feature.UserFeatureService
featureService *feature.FeatureService
}
func NewUserRecommendService() *UserRecommendService {
service := UserRecommendService{
recallService: &RecallService{},
rankService: rank.DefaultRankService(),
userFeatureService: feature.DefaultUserFeatureService(),
featureService: feature.DefaultFeatureService(),
generalRankService: general_rank.DefaultGeneralRankService(),
}
return &service
}
func (r *UserRecommendService) Recommend(context *context.RecommendContext) []*module.Item {
start := time.Now()
var scene, expId string
if context.ExperimentResult != nil {
scene = context.ExperimentResult.SceneName
//expId = context.ExperimentResult.ExpId
} else {
scene, _ = context.Param.GetParameter("scene").(string)
}
userId := r.GetUID(context)
user := module.NewUserWithContext(userId, context)
//loadFeatureStart := time.Now()
// load user features
r.userFeatureService.LoadUserFeatures(user, context)
//if metrics.Enabled() {
//metrics.LoadFeatureDurSecs.WithLabelValues(scene, expId, "before_recall").Observe(time.Since(loadFeatureStart).Seconds())
//}
debugService := debug.NewDebugService(user, context)
var pipelineItems []*module.Item
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
pipelineItems = pipeline.Recommend(user, context, debugService)
}()
recallStart := time.Now()
items := r.recallService.GetItems(user, context)
if metrics.Enabled() {
metrics.RecallDurSecs.WithLabelValues(scene, expId).Observe(time.Since(recallStart).Seconds())
recallCountMap := map[string]int{}
for _, item := range items {
recallCountMap[item.RetrieveId]++
}
for src, count := range recallCountMap {
metrics.RecallItemsPercentage.WithLabelValues(src).Set(float64(count) / float64(len(items)))
}
}
debugService.WriteRecallLog(user, items, context)
filterStart := time.Now()
// filter
items = r.Filter(user, items, context)
if metrics.Enabled() {
metrics.FilterDurSecs.WithLabelValues(scene, expId).Observe(time.Since(filterStart).Seconds())
}
debugService.WriteFilterLog(user, items, context)
generalRankStart := time.Now()
// general rank
items = r.generalRankService.Rank(user, items, context)
if metrics.Enabled() {
metrics.GeneralRankDurSecs.WithLabelValues(scene, expId).Observe(time.Since(generalRankStart).Seconds())
}
//debugService.WriteGeneralLog(user, items, context)
//loadFeatureStart = time.Now()
// load user or item features
// can load data from datasource(holo, ots, redis)
// after load data, use feature engine to create or modify features
items = r.featureService.LoadFeatures(user, items, context)
//if metrics.Enabled() {
//metrics.LoadFeatureDurSecs.WithLabelValues(scene, expId, "before_rank").Observe(time.Since(loadFeatureStart).Seconds())
//}
rankStart := time.Now()
r.rankService.Rank(user, items, context)
if metrics.Enabled() {
metrics.RankDurSecs.WithLabelValues(scene, expId).Observe(time.Since(rankStart).Seconds())
}
wg.Wait()
items = r.mergePipelineItems(items, pipelineItems)
debugService.WriteRankLog(user, items, context)
sortStart := time.Now()
// sort items
items = r.Sort(user, items, context)
if metrics.Enabled() {
metrics.SortDurSecs.WithLabelValues(scene, expId).Observe(time.Since(sortStart).Seconds())
}
size := context.Size
if size > len(items) {
size = len(items)
log.Warning(fmt.Sprintf("requestId=%s\tmodule=recommend\tevent=filter\tuid=%s\tmsg=length of items less than size\tcount=%d", context.RecommendId, userId, len(items)))
if metrics.Enabled() {
metrics.SizeNotEnoughTotal.WithLabelValues(scene, expId).Inc()
}
}
items = items[:size]
// asynchronous clean hook func
for _, hf := range hook.RecommendCleanHooks {
go hf(context, user, items)
}
if metrics.Enabled() {
metrics.RecTotal.WithLabelValues(scene, expId).Inc()
metrics.RecDurSecs.WithLabelValues(scene, expId).Observe(time.Since(start).Seconds())
}
return items
}
func (r *UserRecommendService) mergePipelineItems(items []*module.Item, pipelineItems []*module.Item) []*module.Item {
itemMap := make(map[module.ItemId]bool, len(items))
for _, item := range items {
itemMap[item.Id] = true
}
for _, item := range pipelineItems {
if _, ok := itemMap[item.Id]; !ok {
itemMap[item.Id] = true
items = append(items, item)
}
}
return items
}