mirror of
https://github.com/twitter/the-algorithm.git
synced 2024-06-27 13:36:03 +02:00
ef4c5eb65e
Please note we have force-pushed a new initial commit in order to remove some publicly-available Twitter user information. Note that this process may be required in the future.
49 lines
2.0 KiB
Scala
49 lines
2.0 KiB
Scala
package com.twitter.home_mixer.functional_component.scorer
|
|
|
|
import com.twitter.home_mixer.model.HomeFeatures.InNetworkFeature
|
|
import com.twitter.home_mixer.model.HomeFeatures.IsRetweetFeature
|
|
import com.twitter.home_mixer.model.HomeFeatures.ScoreFeature
|
|
import com.twitter.product_mixer.component_library.model.candidate.TweetCandidate
|
|
import com.twitter.product_mixer.core.feature.Feature
|
|
import com.twitter.product_mixer.core.feature.featuremap.FeatureMap
|
|
import com.twitter.product_mixer.core.feature.featuremap.FeatureMapBuilder
|
|
import com.twitter.product_mixer.core.functional_component.scorer.Scorer
|
|
import com.twitter.product_mixer.core.model.common.CandidateWithFeatures
|
|
import com.twitter.product_mixer.core.model.common.identifier.ScorerIdentifier
|
|
import com.twitter.product_mixer.core.pipeline.PipelineQuery
|
|
import com.twitter.stitch.Stitch
|
|
|
|
/**
|
|
* Scales scores of each out-of-network tweet by the specified scale factor
|
|
*/
|
|
object OONTweetScalingScorer extends Scorer[PipelineQuery, TweetCandidate] {
|
|
|
|
override val identifier: ScorerIdentifier = ScorerIdentifier("OONTweetScaling")
|
|
|
|
override val features: Set[Feature[_, _]] = Set(ScoreFeature)
|
|
|
|
private val ScaleFactor = 0.75
|
|
|
|
override def apply(
|
|
query: PipelineQuery,
|
|
candidates: Seq[CandidateWithFeatures[TweetCandidate]]
|
|
): Stitch[Seq[FeatureMap]] = {
|
|
Stitch.value {
|
|
candidates.map { candidate =>
|
|
val score = candidate.features.getOrElse(ScoreFeature, None)
|
|
val updatedScore = if (selector(candidate)) score.map(_ * ScaleFactor) else score
|
|
FeatureMapBuilder().add(ScoreFeature, updatedScore).build()
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* We should only be applying this multiplier to Out-Of-Network tweets.
|
|
* In-Network Retweets of Out-Of-Network tweets should not have this multiplier applied
|
|
*/
|
|
private def selector(candidate: CandidateWithFeatures[TweetCandidate]): Boolean = {
|
|
!candidate.features.getOrElse(InNetworkFeature, false) &&
|
|
!candidate.features.getOrElse(IsRetweetFeature, false)
|
|
}
|
|
}
|