c

org.graphframes.lib

ParallelPersonalizedPageRank

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:

  • pageranks (VectorType): the pageranks of this vertex from all input source vertices

The resulting edges DataFrame contains one additional column:

  • weight (DoubleType): the normalized weight of this edge after running PageRank
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    Implicit
    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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    This member is added by an implicit conversion from ParallelPersonalizedPageRank to Ensuring[ParallelPersonalizedPageRank] performed by method Ensuring in scala.Predef.
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  16. final def isInstanceOf[T0]: Boolean
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  17. def maxIter(value: Int): ParallelPersonalizedPageRank.this.type

    Number of iterations to run

  18. final def ne(arg0: AnyRef): Boolean
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  20. final def notifyAll(): Unit
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  21. def resetProbability(value: Double): ParallelPersonalizedPageRank.this.type

    Reset probability "alpha"

  22. def run(): GraphFrame
  23. def sourceIds(values: Array[Any]): ParallelPersonalizedPageRank.this.type

    Source vertices for a Personalized Page Rank

  24. final def synchronized[T0](arg0: ⇒ T0): T0
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  29. def →[B](y: B): (ParallelPersonalizedPageRank, B)
    Implicit
    This member is added by an implicit conversion from ParallelPersonalizedPageRank to ArrowAssoc[ParallelPersonalizedPageRank] performed by method ArrowAssoc in scala.Predef.
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  2. 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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    (Since version 2.12.16) Use formatString.format(value) instead of value.formatted(formatString), or use the f"" string interpolator. In Java 15 and later, formatted resolves to the new method in String which has reversed parameters.

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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