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module Benchmark
module IPS
module Stats
class Bootstrap
include StatsMetric
attr_reader :data, :error, :samples
def initialize(samples, confidence)
dependencies
@iterations = 10_000
@confidence = (confidence / 100.0).to_s
@samples = samples
@data = Kalibera::Data.new({[0] => samples}, [1, samples.size])
interval = @data.bootstrap_confidence_interval(@iterations, @confidence)
@median = interval.median
@error = interval.error
end
# Average stat value
# @return [Float] central_tendency
def central_tendency
@median
end
# Determines how much slower this stat is than the baseline stat
# if this average is lower than the faster baseline, higher average is better (e.g. ips) (calculate accordingly)
# @param baseline [SD|Bootstrap] faster baseline
# @returns [Array<Float, nil>] the slowdown and the error (not calculated for standard deviation)
def slowdown(baseline)
low, slowdown, high = baseline.data.bootstrap_quotient(@data, @iterations, @confidence)
error = Timing.mean([slowdown - low, high - slowdown])
[slowdown, error]
end
def speedup(baseline)
baseline.slowdown(self)
end
def footer
"with #{(@confidence.to_f * 100).round(1)}% confidence"
end
def dependencies
require 'kalibera'
rescue LoadError
puts
puts "Can't load the kalibera gem - this is required to use the :bootstrap stats options."
puts "It's optional, so we don't formally depend on it and it isn't installed along with benchmark-ips."
puts "You probably want to do something like 'gem install kalibera' to fix this."
abort
end
end
end
end
end
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