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Simple Fix of SketchMap's non-commutative (issue-1122) #1123

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This PR introduces a simple fix to SketchMap's non-commutative, as illustrated in #1122

The fix is simply to always put the DenseMatrix as the first param so that the update to it is correct.

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CLAassistant commented Jun 30, 2023

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Codecov Report

Patch coverage: 100.00% and project coverage change: +0.23 🎉

Comparison is base (f644ba4) 89.48% compared to head (abf56a8) 89.72%.

❗ Current head abf56a8 differs from pull request most recent head 6b8610d. Consider uploading reports for the commit 6b8610d to get more accurate results

Additional details and impacted files
@@             Coverage Diff             @@
##           develop    #1123      +/-   ##
===========================================
+ Coverage    89.48%   89.72%   +0.23%     
===========================================
  Files          124      124              
  Lines        10028    10030       +2     
  Branches       782      774       -8     
===========================================
+ Hits          8974     8999      +25     
+ Misses        1054     1031      -23     
Impacted Files Coverage Δ
...rc/main/scala/com/twitter/algebird/SketchMap.scala 92.72% <100.00%> (+0.27%) ⬆️

... and 11 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

Comment on lines +54 to +57
val newValuesTable = right.valuesTable match {
case DenseMatrix(_, _, _) => Monoid.plus(right.valuesTable, left.valuesTable)
case _ => Monoid.plus(left.valuesTable, right.valuesTable)
}
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Suggested change
val newValuesTable = right.valuesTable match {
case DenseMatrix(_, _, _) => Monoid.plus(right.valuesTable, left.valuesTable)
case _ => Monoid.plus(left.valuesTable, right.valuesTable)
}
val newValuesTable = right.valuesTable match {
case _: DenseMatrix[V] => Monoid.plus(right.valuesTable, left.valuesTable)
case _ => Monoid.plus(left.valuesTable, right.valuesTable)
}

Also, perhaps it would make more sense to address this here

override def plus(a: AdaptiveMatrix[V], b: AdaptiveMatrix[V]): AdaptiveMatrix[V] =

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Also, perhaps it would make more sense to address this here

yeah, pretty much agreed.
I was afraid to touch AdaptiveMatrix due to unfamiliarity of it, but will try to see if I can fix that directly.

@@ -53,6 +55,38 @@ class SketchMapTest extends AnyWordSpec with Matchers {
assert(sm.totalValue == totalCount)
}

"plus should work commutatively" in {
implicit val m = Monoid.longMonoid
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I believe this is not required

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@regadas regadas left a comment

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thanks for the PR @Peilin-Yang

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4 participants