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require 'Estimators'
require 'Sample'
class EstimationResults
attr_reader :estimator
def initialize(estimator, samples)
@samples = samples
@totalTime = samples.keys.max
@totalSize = @samples[@totalTime].bytesDownloaded + @samples[@totalTime].bytesLeft
@estimator = estimator
@maxError = nil
@estimations = nil
@absoluteErrors = nil
@relativeErrors = nil
@rootMeanSquareErrorRelative = nil
end
def getRootMeanSquareErrorRelative
if @rootMeanSquareErrorRelative == nil
relativeErrors = getRelativeErrors
@rootMeanSquareErrorRelative = 0.0
relativeErrors.each_value do |x|
@rootMeanSquareErrorRelative += x**2
end
@rootMeanSquareErrorRelative = Math.sqrt( @rootMeanSquareErrorRelative / relativeErrors.size )
end
return @rootMeanSquareErrorRelative
end
# returns the root mean square error for a specific interval of the download
# left and right must be floats between 0.0 (no bytes downloaded, start of download) and 1.0 (download complete), right must be greater than left
def getRootMeanSquareErrorRelative(left, right)
relativeErrors = getRelativeErrors
rmser = 0.0
n = 0
@samples.keys.each do |x|
percentage = @samples[x].bytesDownloaded.to_f / @totalSize
if percentage >= left and percentage <= right
rmser += relativeErrors[x]**2
n += 1
end
end
rmser = Math.sqrt( rmser / n )
return rmser
end
def getRelativeErrors
if @relativeErrors == nil
@relativeErrors = Hash.new
absoluteErrors = getAbsoluteErrors
absoluteErrors.keys.sort.each do |time|
timeLeft = @totalTime - time;
@relativeErrors[time] = absoluteErrors[time].abs.to_f / timeLeft
@relativeErrors[time] = @maxError if @maxError != nil and @relativeErrors[time] > @maxError
end
end
return @relativeErrors
end
def setMaxError(maxError)
if maxError != @maxError
@maxError = maxError
@relativeErrors = nil
@rootMeanSquareErrorRelative = nil
end
end
def getAbsoluteErrors
if @absoluteErrors == nil
@absoluteErrors = Hash.new
estimations = getEstimations
estimations.keys.sort.each do |time|
@absoluteErrors[time] = @estimations[time] - (@totalTime - time)
end
end
return @absoluteErrors
end
def getEstimations
if @estimations == nil
@estimations = Hash.new
@samples.values.sort.each do |sample|
@estimator.process(sample)
@estimations[sample.time] = @estimator.estimate
end
end
return @estimations
end
end
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