diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..fa1c2df --- /dev/null +++ b/.gitignore @@ -0,0 +1,55 @@ + + +# Created by https://www.gitignore.io/api/ruby + +### Ruby ### +*.gem +*.rbc +/.config +/coverage/ +/InstalledFiles +/pkg/ +/spec/reports/ +/spec/examples.txt +/test/tmp/ +/test/version_tmp/ +/tmp/ + +# Used by dotenv library to load environment variables. +# .env + +## Specific to RubyMotion: +.dat* +.repl_history +build/ +*.bridgesupport +build-iPhoneOS/ +build-iPhoneSimulator/ + +## Specific to RubyMotion (use of CocoaPods): +# +# We recommend against adding the Pods directory to your .gitignore. However +# you should judge for yourself, the pros and cons are mentioned at: +# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control +# +# vendor/Pods/ + +## Documentation cache and generated files: +/.yardoc/ +/_yardoc/ +/doc/ +/rdoc/ + +## Environment normalization: +/.bundle/ +/vendor/bundle +/lib/bundler/man/ + +# for a library or gem, you might want to ignore these files since the code is +# intended to run in multiple environments; otherwise, check them in: +# Gemfile.lock +# .ruby-version +# .ruby-gemset + +# unless supporting rvm < 1.11.0 or doing something fancy, ignore this: +.rvmrc diff --git a/.rspec b/.rspec new file mode 100644 index 0000000..83e16f8 --- /dev/null +++ b/.rspec @@ -0,0 +1,2 @@ +--color +--require spec_helper diff --git a/.rubocop.yml b/.rubocop.yml new file mode 100644 index 0000000..b7bbfaa --- /dev/null +++ b/.rubocop.yml @@ -0,0 +1,5 @@ +AllCops: + TargetRubyVersion: 2.3 + +Metrics/LineLength: + Max: 160 diff --git a/.travis.yml b/.travis.yml new file mode 100644 index 0000000..8d47202 --- /dev/null +++ b/.travis.yml @@ -0,0 +1,4 @@ +language: ruby +rvm: + - 2.2 +script: bundle exec rake test diff --git a/Gemfile b/Gemfile new file mode 100644 index 0000000..7f4f5e9 --- /dev/null +++ b/Gemfile @@ -0,0 +1,5 @@ +# frozen_string_literal: true + +source 'https://rubygems.org' + +gemspec diff --git a/Gemfile.lock b/Gemfile.lock new file mode 100644 index 0000000..e75f354 --- /dev/null +++ b/Gemfile.lock @@ -0,0 +1,56 @@ +PATH + remote: . + specs: + stream_stat (0.1.0) + +GEM + remote: https://rubygems.org/ + specs: + ast (2.3.0) + diff-lcs (1.2.5) + parser (2.3.1.4) + ast (~> 2.2) + powerpack (0.1.1) + rainbow (2.1.0) + rake (11.3.0) + rspec (3.5.0) + rspec-core (~> 3.5.0) + rspec-expectations (~> 3.5.0) + rspec-mocks (~> 3.5.0) + rspec-core (3.5.4) + rspec-support (~> 3.5.0) + rspec-expectations (3.5.0) + diff-lcs (>= 1.2.0, < 2.0) + rspec-support (~> 3.5.0) + rspec-its (1.2.0) + rspec-core (>= 3.0.0) + rspec-expectations (>= 3.0.0) + rspec-mocks (3.5.0) + diff-lcs (>= 1.2.0, < 2.0) + rspec-support (~> 3.5.0) + rspec-support (3.5.0) + rubocop (0.43.0) + parser (>= 2.3.1.1, < 3.0) + powerpack (~> 0.1) + rainbow (>= 1.99.1, < 3.0) + ruby-progressbar (~> 1.7) + unicode-display_width (~> 1.0, >= 1.0.1) + rubocop-rspec (1.7.0) + rubocop (>= 0.42.0) + ruby-progressbar (1.8.1) + unicode-display_width (1.1.1) + +PLATFORMS + ruby + +DEPENDENCIES + bundler + rake + rspec + rspec-its + rubocop + rubocop-rspec + stream_stat! + +BUNDLED WITH + 1.13.1 diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..8be4a7f --- /dev/null +++ b/README.md @@ -0,0 +1,41 @@ +StreamStat: Aggregate large data statictics with streaming. + +[![Build Status](https://travis-ci.org/ne-sachirou/stream_stat.svg?branch=master)](https://travis-ci.org/ne-sachirou/stream_stat) + +StreamStat +== +A library to aggragate statistics of large data with streaming, less memory. + +Usage +-- +Aggragate a SD of large_data. + +```ruby +p StreamStat.new(large_data).inject { |_a, stat| stat }.sd +``` + +View the intermediate results. + +```ruby +p StreamStat.new(large_data) + .lazy + .each_with_index + .inject { |_a, r| stat, i = r; p stat.sd if i % 100 == 0; stst } + .sd +``` + +Installation +-- +Add this line to your application's Gemfile: + +```ruby +gem 'stream_stat' +``` + +And then execute: + + $ bundle + +Or install it yourself as: + + $ gem install stream_stat diff --git a/Rakefile b/Rakefile new file mode 100644 index 0000000..a483abf --- /dev/null +++ b/Rakefile @@ -0,0 +1,9 @@ +# frozen_string_literal: true + +require 'bundler/gem_tasks' + +desc 'Test.' +task :test do + sh 'bundle exec rubocop -r rubocop-rspec' + sh 'bundle exec rspec' +end diff --git a/lib/stream_stat.rb b/lib/stream_stat.rb new file mode 100644 index 0000000..fa096a4 --- /dev/null +++ b/lib/stream_stat.rb @@ -0,0 +1,75 @@ +# frozen_string_literal: true + +# StreamStat: Aggregate large data statictics with streaming. +# +# = StreamStat +# A library to aggragate statistics of large data with streaming, less memory. +# +# == Usage +# Aggragate a SD of large_data. +# +# p StreamStat.new(large_data).inject { |_a, stat| stat }.sd +# +# View the intermediate results. +# +# p StreamStat.new(large_data) +# .lazy +# .each_with_index +# .inject { |_a, r| stat, i = r; p stat.sd if i % 100 == 0; stst } +# .sd +class StreamStat + include Enumerable + + # Accumrator. + # + # This holds :avg, :variance & :sd. + class V + def initialize(length = 0, sum = 0, variance_sum = 0.0) + @length = length + @sum = sum + @variance_sum = variance_sum + end + + def next(item) + self.class.new( + @length + 1, + @sum + item, + next_variance_sum(avg, (@sum + item).to_f / (@length + 1), item) + ) + end + + def avg + @length.zero? ? 0.0 : @sum.to_f / @length + end + + def variance + @length.zero? ? 0.0 : @variance_sum / @length + end + + def sd + Math.sqrt variance + end + + private + + def next_variance_sum(current_avg, next_avg, item) + (@variance_sum + (next_avg**2 - current_avg**2) * @length + 2 * (current_avg - next_avg) * @sum) + (item - next_avg)**2 + end + end + + def initialize(enum) + @enum = enum + end + + def each + ys = Enumerator.new do |y| + @enum.lazy.inject(V.new) do |v1, item| + v2 = v1.next item + y << v2 + v2 + end + end + ys.each { |avg| yield avg } if block_given? + ys + end +end diff --git a/lib/stream_stat/version.rb b/lib/stream_stat/version.rb new file mode 100644 index 0000000..38f2240 --- /dev/null +++ b/lib/stream_stat/version.rb @@ -0,0 +1,5 @@ +# frozen_string_literal: true + +class StreamStat + VERSION = '0.1.0' +end diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb new file mode 100644 index 0000000..9f3f9be --- /dev/null +++ b/spec/spec_helper.rb @@ -0,0 +1,108 @@ +# frozen_string_literal: true + +require 'rspec/its' +Dir["#{__dir__}/support/*.rb"].each { |rb| require_relative rb } +$LOAD_PATH.unshift "#{__dir__}/../lib" +require 'stream_stat' + +# This file was generated by the `rspec --init` command. Conventionally, all +# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`. +# The generated `.rspec` file contains `--require spec_helper` which will cause +# this file to always be loaded, without a need to explicitly require it in any +# files. +# +# Given that it is always loaded, you are encouraged to keep this file as +# light-weight as possible. Requiring heavyweight dependencies from this file +# will add to the boot time of your test suite on EVERY test run, even for an +# individual file that may not need all of that loaded. Instead, consider making +# a separate helper file that requires the additional dependencies and performs +# the additional setup, and require it from the spec files that actually need +# it. +# +# The `.rspec` file also contains a few flags that are not defaults but that +# users commonly want. +# +# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration +RSpec.configure do |config| + # rspec-expectations config goes here. You can use an alternate + # assertion/expectation library such as wrong or the stdlib/minitest + # assertions if you prefer. + config.expect_with :rspec do |expectations| + # This option will default to `true` in RSpec 4. It makes the `description` + # and `failure_message` of custom matchers include text for helper methods + # defined using `chain`, e.g.: + # be_bigger_than(2).and_smaller_than(4).description + # # => "be bigger than 2 and smaller than 4" + # ...rather than: + # # => "be bigger than 2" + expectations.include_chain_clauses_in_custom_matcher_descriptions = true + end + + # rspec-mocks config goes here. You can use an alternate test double + # library (such as bogus or mocha) by changing the `mock_with` option here. + config.mock_with :rspec do |mocks| + # Prevents you from mocking or stubbing a method that does not exist on + # a real object. This is generally recommended, and will default to + # `true` in RSpec 4. + mocks.verify_partial_doubles = true + end + + # This option will default to `:apply_to_host_groups` in RSpec 4 (and will + # have no way to turn it off -- the option exists only for backwards + # compatibility in RSpec 3). It causes shared context metadata to be + # inherited by the metadata hash of host groups and examples, rather than + # triggering implicit auto-inclusion in groups with matching metadata. + config.shared_context_metadata_behavior = :apply_to_host_groups + + # The settings below are suggested to provide a good initial experience + # with RSpec, but feel free to customize to your heart's content. + # # This allows you to limit a spec run to individual examples or groups + # # you care about by tagging them with `:focus` metadata. When nothing + # # is tagged with `:focus`, all examples get run. RSpec also provides + # # aliases for `it`, `describe`, and `context` that include `:focus` + # # metadata: `fit`, `fdescribe` and `fcontext`, respectively. + # config.filter_run_when_matching :focus + # + # # Allows RSpec to persist some state between runs in order to support + # # the `--only-failures` and `--next-failure` CLI options. We recommend + # # you configure your source control system to ignore this file. + # config.example_status_persistence_file_path = "spec/examples.txt" + # + # # Limits the available syntax to the non-monkey patched syntax that is + # # recommended. For more details, see: + # # - http://rspec.info/blog/2012/06/rspecs-new-expectation-syntax/ + # # - http://www.teaisaweso.me/blog/2013/05/27/rspecs-new-message-expectation-syntax/ + # # - http://rspec.info/blog/2014/05/notable-changes-in-rspec-3/#zero-monkey-patching-mode + # config.disable_monkey_patching! + # + # # This setting enables warnings. It's recommended, but in some cases may + # # be too noisy due to issues in dependencies. + # config.warnings = true + # + # # Many RSpec users commonly either run the entire suite or an individual + # # file, and it's useful to allow more verbose output when running an + # # individual spec file. + # if config.files_to_run.one? + # # Use the documentation formatter for detailed output, + # # unless a formatter has already been configured + # # (e.g. via a command-line flag). + # config.default_formatter = 'doc' + # end + # + # # Print the 10 slowest examples and example groups at the + # # end of the spec run, to help surface which specs are running + # # particularly slow. + # config.profile_examples = 10 + # + # # Run specs in random order to surface order dependencies. If you find an + # # order dependency and want to debug it, you can fix the order by providing + # # the seed, which is printed after each run. + # # --seed 1234 + # config.order = :random + # + # # Seed global randomization in this process using the `--seed` CLI option. + # # Setting this allows you to use `--seed` to deterministically reproduce + # # test failures related to randomization by passing the same `--seed` value + # # as the one that triggered the failure. + # Kernel.srand config.seed +end diff --git a/spec/stream_stat/v_spec.rb b/spec/stream_stat/v_spec.rb new file mode 100644 index 0000000..5fd7f15 --- /dev/null +++ b/spec/stream_stat/v_spec.rb @@ -0,0 +1,74 @@ +# frozen_string_literal: true + +require 'spec_helper' + +RSpec.describe StreamStat::V do + describe '#next' do + context 'When V has 0 length' do + subject { described_class.new.next(57) } + + its(:avg) { is_expected.to eq 57.0 } + its(:variance) { is_expected.to eq 0.0 } + its(:sd) { is_expected.to eq 0.0 } + end + + context 'When calculated values from an item is given to V' do + subject { described_class.new(1, sum([1]), variance([1]) * 1).next(2) } + + its(:avg) { is_expected.to eq avg [1, 2] } + its(:variance) { is_expected.to eq variance [1, 2] } + its(:sd) { is_expected.to eq sd [1, 2] } + end + + context 'When calculated values is given to V' do + subject { described_class.new(data.size, sum(data), variance(data) * data.size).next(57) } + let(:data) { (1..100).to_a } + + its(:avg) { is_expected.to eq avg [*data, 57] } + its(:variance) { is_expected.to eq variance [*data, 57] } + its(:sd) { is_expected.to eq sd [*data, 57] } + end + end + + describe '#avg' do + it 'returns 0 as a default' do + expect(described_class.new.avg).to eq 0.0 + end + + it 'returns 0 when length is 0' do + expect(described_class.new(0, 57).avg).to eq 0.0 + end + + it 'divides sum by length' do + expect(described_class.new(3, 57).avg).to eq 19.0 + end + end + + describe '#variance' do + it 'returns 0 as a default' do + expect(described_class.new.variance).to eq 0.0 + end + + it 'returns 0 when length is 0' do + expect(described_class.new(0, 0, 57).variance).to eq 0.0 + end + + it 'divides variance_sum by length' do + expect(described_class.new(3, 0, 57).variance).to eq 19.0 + end + end + + describe '#sd' do + it 'returns 0 as a default' do + expect(described_class.new.sd).to eq 0.0 + end + + it 'returns 0 when length is 0' do + expect(described_class.new(0, 0, 48).sd).to eq 0.0 + end + + it 'returns square root of variance' do + expect(described_class.new(3, 0, 48).sd).to eq 4.0 + end + end +end diff --git a/spec/stream_stat_spec.rb b/spec/stream_stat_spec.rb new file mode 100644 index 0000000..e4941ef --- /dev/null +++ b/spec/stream_stat_spec.rb @@ -0,0 +1,31 @@ +# frozen_string_literal: true + +require 'spec_helper' + +RSpec.describe StreamStat do + describe '#each' do + it 'return an Enumerable' do + expect(described_class.new([]).each).to be_a Enumerable + end + + context 'When iterates with data' do + let(:data) { (1..100).to_a } + let :expected do + 1.upto(data.size) + .collect { |i| data.take i } + .collect { |data| { avg: avg(data), variance: variance(data), sd: sd(data) } } + end + + it 'iterates statistic result with streaming' do + actual = [] + described_class.new(data).each { |stat| actual << { avg: stat.avg, variance: stat.variance, sd: stat.sd } } + expect(actual).to eq expected + end + + it 'returns an Enumerable which iterates statistic result' do + actual = described_class.new(data).lazy.collect { |stat| { avg: stat.avg, variance: stat.variance, sd: stat.sd } }.to_a + expect(actual).to eq expected + end + end + end +end diff --git a/spec/support/stat.rb b/spec/support/stat.rb new file mode 100644 index 0000000..7b9b595 --- /dev/null +++ b/spec/support/stat.rb @@ -0,0 +1,18 @@ +# frozen_string_literal: true + +def sum(arr) + arr.inject(:+).to_f +end + +def avg(arr) + sum(arr) / arr.size +end + +def variance(arr) + avg = avg arr + sum(arr.collect { |item| (item - avg)**2 }) / arr.size +end + +def sd(arr) + Math.sqrt variance arr +end diff --git a/stream_stat.gemspec b/stream_stat.gemspec new file mode 100644 index 0000000..c5f2872 --- /dev/null +++ b/stream_stat.gemspec @@ -0,0 +1,31 @@ +# coding: utf-8 +# frozen_string_literal: true + +lib = File.expand_path('../lib', __FILE__) +$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib) +require 'stream_stat/version' + +Gem::Specification.new do |spec| + spec.name = 'stream_stat' + spec.version = StreamStat::VERSION + spec.authors = ['ne_Sachirou'] + spec.email = ['utakata.c4se@gmail.com'] + + spec.summary = 'StreamStat: Aggregate large data statictics with streaming.' + spec.description = 'A library to aggragate statistics of large data with streaming, less memory.' + spec.homepage = 'https://github.com/ne-sachirou/stream_stat' + + spec.files = `git ls-files -z`.split("\x0").reject do |f| + f.match(%r{^(test|spec|features)/}) + end + spec.bindir = 'exe' + spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) } + spec.require_paths = ['lib'] + + spec.add_development_dependency 'bundler' + spec.add_development_dependency 'rake' + spec.add_development_dependency 'rspec' + spec.add_development_dependency 'rspec-its' + spec.add_development_dependency 'rubocop' + spec.add_development_dependency 'rubocop-rspec' +end