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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.
46 lines
2.1 KiB
Scala
46 lines
2.1 KiB
Scala
package com.twitter.home_mixer.functional_component.filter
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import com.twitter.home_mixer.model.HomeFeatures.IsRetweetFeature
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import com.twitter.home_mixer.util.CandidatesUtil
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import com.twitter.product_mixer.component_library.model.candidate.TweetCandidate
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import com.twitter.product_mixer.core.functional_component.filter.Filter
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import com.twitter.product_mixer.core.functional_component.filter.FilterResult
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import com.twitter.product_mixer.core.model.common.CandidateWithFeatures
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import com.twitter.product_mixer.core.model.common.identifier.FilterIdentifier
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import com.twitter.product_mixer.core.pipeline.PipelineQuery
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import com.twitter.stitch.Stitch
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import scala.collection.mutable
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object RetweetDeduplicationFilter extends Filter[PipelineQuery, TweetCandidate] {
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override val identifier: FilterIdentifier = FilterIdentifier("RetweetDeduplication")
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override def apply(
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query: PipelineQuery,
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candidates: Seq[CandidateWithFeatures[TweetCandidate]]
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): Stitch[FilterResult[TweetCandidate]] = {
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// If there are 2 retweets of the same native tweet, we will choose the first one
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// The tweets are returned in descending score order, so we will choose the higher scored tweet
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val dedupedTweetIdsSet =
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candidates.partition(_.features.getOrElse(IsRetweetFeature, false)) match {
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case (retweets, nativeTweets) =>
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val nativeTweetIds = nativeTweets.map(_.candidate.id)
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val seenTweetIds = mutable.Set[Long]() ++ nativeTweetIds
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val dedupedRetweets = retweets.filter { retweet =>
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val tweetIdAndSourceId = CandidatesUtil.getTweetIdAndSourceId(retweet)
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val retweetIsUnique = tweetIdAndSourceId.forall(!seenTweetIds.contains(_))
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if (retweetIsUnique) {
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seenTweetIds ++= tweetIdAndSourceId
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}
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retweetIsUnique
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}
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(nativeTweets ++ dedupedRetweets).map(_.candidate.id).toSet
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}
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val (kept, removed) =
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candidates
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.map(_.candidate).partition(candidate => dedupedTweetIdsSet.contains(candidate.id))
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Stitch.value(FilterResult(kept = kept, removed = removed))
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}
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}
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