class GiniCalculator extends ImpurityCalculator[Char]
Calculate the weighted Gini Impurity: weight * (1 - \sum_j f_j^2), where f_j is the frequency of the jth label
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- ImpurityCalculator
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Instance Constructors
- new GiniCalculator(totalCategoryWeights: Array[Double], totalSquareSum: Double, totalWeight: Double)
- totalCategoryWeights
the total weight of each label
- totalSquareSum
the sum of the squares of the weights
- totalWeight
the total weight over all the labels
Value Members
- final def !=(arg0: Any): Boolean
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- final def ##: Int
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- final def ==(arg0: Any): Boolean
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- def add(value: Char, weight: Double): Double
Add a value to the left partition
Add a value to the left partition
- value
to add
- weight
of the value
- returns
the impurity after adding
- Definition Classes
- GiniCalculator → ImpurityCalculator
- final def asInstanceOf[T0]: T0
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- def clone(): AnyRef
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- protected[lang]
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- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- def copy(): GiniCalculator
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- def finalize(): Unit
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- final def getClass(): Class[_ <: AnyRef]
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- @native()
- def getImpurity: Double
Get the impurity at the current state of the calculator
Get the impurity at the current state of the calculator
- returns
impurity
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- GiniCalculator → ImpurityCalculator
- def hashCode(): Int
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- final def notifyAll(): Unit
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- def remove(value: Char, weight: Double): Double
Remove a value from the left partition
Remove a value from the left partition
- value
to remove
- weight
of the value
- returns
the impurity after removing
- Definition Classes
- GiniCalculator → ImpurityCalculator
- def reset(): Unit
Reset the calculator such that every item is on the right
Reset the calculator such that every item is on the right
- Definition Classes
- GiniCalculator → ImpurityCalculator
- final def synchronized[T0](arg0: => T0): T0
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- def toString(): String
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