Packages

•  package root

  Definition Classes

  root

•  package com

  Definition Classes

  root

•  package spotify

  Definition Classes

  com

•  package scio

  Definition Classes

  spotify

•  package extra

  Definition Classes

  scio

•  package annoy

  Main package for Annoy side input APIs.

  Main package for Annoy side input APIs. Import all.

  import com.spotify.scio.extra.annoy._

  Two metrics are available, Angular and Euclidean.

  To save an SCollection[(Int, Array[Float])] to an Annoy file:

  val s = sc.parallelize(Seq( 1-> Array(1.2f, 3.4f), 2 -> Array(2.2f, 1.2f)))

  Save to a temporary location:

  val s1 = s.asAnnoy(Angular, 40, 10)

  Save to a specific location:

  val s1 = s.asAnnoy(Angular, 40, 10, "gs://<bucket>/<path>")

  SCollection[AnnoyUri] can be converted into a side input:

  val s = sc.parallelize(Seq( 1-> Array(1.2f, 3.4f), 2 -> Array(2.2f, 1.2f)))
  val side = s.asAnnoySideInput(metric, dimension, numTrees)

  There's syntactic sugar for saving an SCollection and converting it to a side input:

  val s = sc
    .parallelize(Seq( 1-> Array(1.2f, 3.4f), 2 -> Array(2.2f, 1.2f)))
    .asAnnoySideInput(metric, dimension, numTrees)

  An existing Annoy file can be converted to a side input directly:

  sc.annoySideInput(metric, dimension, numTrees, "gs://<bucket>/<path>")

  AnnoyReader provides nearest neighbor lookups by vector as well as item lookups:

  val data = (0 until 1000).map(x => (x, Array.fill(40)(r.nextFloat())))
  val main = sc.parallelize(data)
  val side = main.asAnnoySideInput(metric, dimension, numTrees)
  
  main.keys.withSideInput(side)
    .map { (i, s) =>
      val annoyReader = s(side)
  
      // get vector by item id, allocating a new Array[Float] each time
      val v1 = annoyReader.getItemVector(i)
  
      // get vector by item id, copy vector into pre-allocated Array[Float]
      val v2 = Array.fill(dim)(-1.0f)
      annoyReader.getItemVector(i, v2)
  
      // get 10 nearest neighbors by vector
      val results = annoyReader.getNearest(v2, 10)
    }

  Definition Classes

  extra

• Angular
• AnnoyMetric
• AnnoyPairSCollection
• AnnoyReader
• AnnoySCollection
• AnnoyScioContext
• AnnoyUri
• Euclidean

com.spotify.scio.extra.annoy

AnnoyReader