class CountMinSketch extends AnyRef
INTERNAL API: Count-Min Sketch datastructure.
Not thread-safe.
An Improved Data Stream Summary: The Count-Min Sketch and its Applications
https://web.archive.org/web/20060907232042/http://www.eecs.harvard.edu/~michaelm/CS222/countmin.pdf
This implementation is mostly taken and adjusted from the Apache V2 licensed project
stream-lib
, located here:
https://github.com/clearspring/stream-lib/blob/master/src/main/java/com/clearspring/analytics/stream/frequency/CountMinSketch.java
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final
def
##(): Int
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def
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- This member is added by an implicit conversion from CountMinSketch to any2stringadd[CountMinSketch] performed by method any2stringadd in scala.Predef.
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def
->[B](y: B): (CountMinSketch, B)
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- This member is added by an implicit conversion from CountMinSketch to ArrowAssoc[CountMinSketch] performed by method ArrowAssoc in scala.Predef.
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def
addObjectAndEstimateCount(item: Any, count: Long): Long
Similar to
add
, however we reuse the fact that the hask buckets have to be calculated foradd
already, and a separateestimateCount
operation would have to calculate them again, so we do it all in one go. -
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- def confidence(): Double
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def
ensuring(cond: (CountMinSketch) ⇒ Boolean, msg: ⇒ Any): CountMinSketch
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- This member is added by an implicit conversion from CountMinSketch to Ensuring[CountMinSketch] performed by method Ensuring in scala.Predef.
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def
ensuring(cond: (CountMinSketch) ⇒ Boolean): CountMinSketch
- Implicit
- This member is added by an implicit conversion from CountMinSketch to Ensuring[CountMinSketch] performed by method Ensuring in scala.Predef.
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def
ensuring(cond: Boolean, msg: ⇒ Any): CountMinSketch
- Implicit
- This member is added by an implicit conversion from CountMinSketch to Ensuring[CountMinSketch] performed by method Ensuring in scala.Predef.
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def
ensuring(cond: Boolean): CountMinSketch
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- This member is added by an implicit conversion from CountMinSketch to Ensuring[CountMinSketch] performed by method Ensuring in scala.Predef.
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final
def
eq(arg0: AnyRef): Boolean
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def
equals(arg0: Any): Boolean
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def
estimateCount(item: Any): Long
The estimate is correct within
'epsilon' * (total item count)
, with probabilityconfidence
. -
def
formatted(fmtstr: String): String
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- This member is added by an implicit conversion from CountMinSketch to StringFormat[CountMinSketch] performed by method StringFormat in scala.Predef.
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notifyAll(): Unit
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def
relativeError(): Double
Referred to as
epsilon
in the whitepaper - def size(): Long
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synchronized[T0](arg0: ⇒ T0): T0
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def
toString(): String
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wait(): Unit
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def
→[B](y: B): (CountMinSketch, B)
- Implicit
- This member is added by an implicit conversion from CountMinSketch to ArrowAssoc[CountMinSketch] performed by method ArrowAssoc in scala.Predef.
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- ArrowAssoc