Class

org.graphframes.lib

ParallelPersonalizedPageRank

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class ParallelPersonalizedPageRank extends Arguments

Parallel Personalized PageRank algorithm implementation.

This implementation uses the standalone GraphFrame interface and runs personalized PageRank in parallel for a fixed number of iterations. This can be run by setting maxIter. The source vertex Ids are set in sourceIds. A simple local implementation of this algorithm is as follows.

var oldPR = Array.fill(n)( 1.0 )
val PR = (0 until n).map(i => if sourceIds.contains(i) alpha else 0.0)
for( iter <- 0 until maxIter ) {
  swap(oldPR, PR)
  for( i <- 0 until n ) {
    PR[i] = (1 - alpha) * inNbrs[i].map(j => oldPR[j] / outDeg[j]).sum
    if (sourceIds.contains(i)) PR[i] += alpha
  }
}

alpha is the random reset probability (typically 0.15), inNbrs[i] is the set of neighbors which link to i and outDeg[j] is the out degree of vertex j.

Note that this is not the "normalized" PageRank and as a consequence pages that have no inlinks will have a PageRank of alpha. In particular, the pageranks may have some values greater than 1.

The resulting vertices DataFrame contains one additional column:

The resulting edges DataFrame contains one additional column:

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  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. def +(other: String): String

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    Implicit information
    This member is added by an implicit conversion from ParallelPersonalizedPageRank to any2stringadd[ParallelPersonalizedPageRank] performed by method any2stringadd in scala.Predef.
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  4. def ->[B](y: B): (ParallelPersonalizedPageRank, B)

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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to ArrowAssoc[ParallelPersonalizedPageRank] performed by method ArrowAssoc in scala.Predef.
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  8. def ensuring(cond: (ParallelPersonalizedPageRank) ⇒ Boolean, msg: ⇒ Any): ParallelPersonalizedPageRank

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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to Ensuring[ParallelPersonalizedPageRank] performed by method Ensuring in scala.Predef.
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  9. def ensuring(cond: (ParallelPersonalizedPageRank) ⇒ Boolean): ParallelPersonalizedPageRank

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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to Ensuring[ParallelPersonalizedPageRank] performed by method Ensuring in scala.Predef.
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  10. def ensuring(cond: Boolean, msg: ⇒ Any): ParallelPersonalizedPageRank

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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to Ensuring[ParallelPersonalizedPageRank] performed by method Ensuring in scala.Predef.
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  11. def ensuring(cond: Boolean): ParallelPersonalizedPageRank

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  14. def finalize(): Unit

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  15. def formatted(fmtstr: String): String

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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to StringFormat[ParallelPersonalizedPageRank] performed by method StringFormat in scala.Predef.
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  16. final def getClass(): Class[_]

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  18. final def isInstanceOf[T0]: Boolean

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  19. def maxIter(value: Int): ParallelPersonalizedPageRank.this.type

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    Number of iterations to run

  20. final def ne(arg0: AnyRef): Boolean

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  21. final def notify(): Unit

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  22. final def notifyAll(): Unit

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  23. def resetProbability(value: Double): ParallelPersonalizedPageRank.this.type

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    Reset probability "alpha"

  24. def run(): GraphFrame

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  25. def sourceIds(values: Array[Any]): ParallelPersonalizedPageRank.this.type

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    Source vertices for a Personalized Page Rank

  26. final def synchronized[T0](arg0: ⇒ T0): T0

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  27. def toString(): String

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  30. final def wait(arg0: Long): Unit

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  31. def [B](y: B): (ParallelPersonalizedPageRank, B)

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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to ArrowAssoc[ParallelPersonalizedPageRank] performed by method ArrowAssoc in scala.Predef.
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Inherited from Arguments

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Inherited by implicit conversion any2stringadd from ParallelPersonalizedPageRank to any2stringadd[ParallelPersonalizedPageRank]

Inherited by implicit conversion StringFormat from ParallelPersonalizedPageRank to StringFormat[ParallelPersonalizedPageRank]

Inherited by implicit conversion Ensuring from ParallelPersonalizedPageRank to Ensuring[ParallelPersonalizedPageRank]

Inherited by implicit conversion ArrowAssoc from ParallelPersonalizedPageRank to ArrowAssoc[ParallelPersonalizedPageRank]

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