Tokyo Ruby Kaigi

Transcript

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   None
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   ͜Μʹͪ͸ʂ

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   ೔ຊޠೖྗࢼݧ

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   Aaron Patterson @tenderlove

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   GitHub

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   ko1: ϓϩάϥϛϯάΛ͍ͯͯ͠ʮ͓͓ɺ ੌ͍ίʔυ͕ॻ͚ͨʯʮ͜Ε͸ੌ͍΋ͷ Λ࡞ͬͯ͠·ͬͨʯͷΑ͏ͳܦݧͳͲ

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   Me: ʮੌ͍ίʔυʯ ͍͍ͬͯͬͨԿͩΖ͏

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   None
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   ;ͨͭͷҙຯ ڪΖ͍͠ / ා͍ ૉ੖Β͍͠ / ྑ͍

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    ೋͭͷτϐοΫ ڪΖ͍͠ / ා͍: PHP ૉ੖Β͍͠ / ྑ͍: Computer Vision

    ൿີ
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    ੌ͍ίʔυ ૉ੖Β͍͠ / ྑ͍

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    ίϯϐϡʔλ Ϗδϣϯ

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    ΨϥΫλ͕ ͍ͬͺ͍

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    Magic The Gathering (MtG)ͱ͸

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    Collectible Card Game

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    ࢲͷ໰୊ (Χʔυͷத਎) • Too many cards • Don’t know what

    they do • Are they worth any money? • Plus many more!
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    ίϯϐϡʔλʔʹ߹͏ ໰୊Έ͍ͨ Seems like a job for computers!

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    ࢲͷղܾ

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    ਓ޻஌ೳ Χϝϥ ೣ! Ruby!

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    High Level Process

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    ࣸਅΛࡱΔ ΧʔυΛൈ͚Δ ΧʔυΛ֬ೝ͢Δ σʔλΛอଘ͢Δ

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    Χʔυͷೝࣝ

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    श ͬͨ ਪଌ ϓϩϯϓτ ڭ͑Δ ίʔύε

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    श ͬͨ ਪଌ ϓϩϯϓτ ڭ͑Δ ίʔύ ε

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    ਓ޻஌ೳ

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    σʔλɹϞσϧ

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    Χʔυͷ৘ใ

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    ࣸਅ ໊લ ਓؾ౓ ηοτ

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    image belongs_to(:card) card has_one(:image)

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    None
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    image belongs_to(:card) card has_many(:images)

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    None
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    image habtm(:cards) card habmt(:image)

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    ׬શσʔλϞσϧ Cards Images Hashes habtm has_many

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    ίʔύεͷੜ੒

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    Executor Pool class ThreadExecutor def initialize size @queue = Queue.new

    @size = size @pool = size.times.map { |i| Thread.new { while job = @queue.pop; job.run end } } end def execute job = Proc.new promise = Promise.new job @queue << promise promise end def shutdown @size.times { @queue << nil } @pool.each(&:join) end end
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    Queue up work promise = @executor.execute do @http_pool.with_connection do |conn|

    uri = URI 'http://gatherer.wizards.com/Pages/Default.aspx' response = conn.request uri # save the response end end # some time later promise.value
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    Me Wizards

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    1.6GB

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    http://mtgjson.com/

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    ॻ͘લʹ άʔάϧͨ͠ํ͕͍͍

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    Χʔυͷೝࣝ

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    ஌֮తϋογϡ libphash (gem install phasion)

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    11998341215223291070 12079686925145871551 Reference Scanned

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    ϋϛϯάڑ཭ require 'phashion' left = Phashion.image_hash_for "a.jpg" right = Phashion.image_hash_for

    "b.jpg" p Phashion.hamming_distance left, right # => 8
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    5622372658725034411 12079686925145871551 Reference Scanned

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    ϋϛϯάڑ཭ require 'phashion' left = Phashion.image_hash_for "c.jpg" right = Phashion.image_hash_for

    "b.jpg" p Phashion.hamming_distance left, right # => 28
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    ϋογϡΛ௥Ճ͢Δͱ ஌͕ࣝ૿͑Δ

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    ϋʔυ΢ΣΞ

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    None
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    None
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    None
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    ιϑτ΢ΣΞ

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    OpenCV https://github.com/ruby-opencv/ruby-opencv

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    ࡱͬͨࣸਅ

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    None
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    ཉ͍͠Πϝʔδ

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    None
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    Χʔυͷൈ͖ํ

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    ؆୯ͳ8ஈ֊͚ͩ!* * ؆୯͡Όͳ͍ɺଟ෼

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    None
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    લॲཧ

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    άϨʔεέʔϧ gray = OpenCV.BGR2GRAY img

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    None
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    Τοδݕग़ canny_img = gray.canny @thresh, @thresh http://en.wikipedia.org/wiki/Canny_edge_detector

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    None
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    ྠֲΛݟ͚ͭΔ contours = [] contour_node = processed.find_contours( :mode => OpenCV::CV_RETR_TREE,

    :method => OpenCV::CV_CHAIN_APPROX_SIMPLE) while contour_node unless contour_node.hole? contours << contour_node end contour_node = contour_node.h_next end
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    ྠֲ ݀

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    None
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    Ұ൪େ͖ͳྠֲ max = contours.max_by { |c| c.contour_area }

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    None
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    ଟ֯ܗΛݟ͚ͭΔ approx = max.approx_poly(:method => :dp, :recursive => true, :accuracy

    => 0.02 * peri) x = approx.convex_hull2.to_a clockwise_points = clockwise x.reverse
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    None
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    ಁࢹม׵ͷߦྻ to = [ OpenCV::CvPoint2D32f.new(0, 0), OpenCV::CvPoint2D32f.new(width, 0), OpenCV::CvPoint2D32f.new(width, height),

    OpenCV::CvPoint2D32f.new(0, height), ] from = polygon_points transform = OpenCV::CvMat.get_perspective_transform(from, to)
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    ΠϝʔδΛม׵͢Δ new_img = img.warp_perspective transform

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    None
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    ڥք࠲ඪΛઃఆ͢Δ new_img.set_roi OpenCV::CvRect.new(0, 0, width, height)

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    None
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    It’s Just That Easy!

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    ϢʔβʔΠϯλʔϑΣΠε ΧϝϥͰ ࡱͬͨ Πϝʔδ ਪଌ #1 ਪଌ #2 ਪଌ #3

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    None
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    Կ͕͋Δʁ Card.joins(:images) .where('images.type' => 'UserImage') .group('cards.name') .count

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    Ͳͷ͙Β͍ྑ͍ʁ Card.joins(:images) # best .where('images.type' => 'UserImage') .order('rating desc').first Card.joins(:images)

    # worst .where('images.type' => 'UserImage') .order('rating asc').first
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    ࠷ߴ:

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    ࠷௿:

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    ϓϩδΣΫτͷ໰୊

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    য఺ͷ࣌ؒ

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    None
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    ࣦഊͷ࣌

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    None
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    ֆ͸ࣅͯΔ

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    None
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    अຐೣ

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    None
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    ར఺ ઃఆ͸؆୯ ඞཁϋʔυ΢ΣΞ͸͋·Γͳ͍ ͍҆ ΩϟϦϒϨʔτ͠ͳ͍

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    ܽ఺ ෳࡶͳιϑτ΢ΣΞ ࿑ಇ ֬ೝͷ஗͞

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    ࠓޙͷ׆ಈ

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    ࣗಈԽ

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    ੌ͍ίʔυ ڪΖ͍͠ / ා͍

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     PHP + Ruby

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     Phuby (ϑʔϏΟ) https://github.com/tenderlove/phuby એ఻

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     Examples

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     PHPͷ ΦϒδΣΫτΛ࢖͏

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     ਺ࣈ require 'phuby' Phuby::Runtime.php do |runtime| runtime.eval "$v = strlen('PHP

     INSIDE OF RUBY');" puts runtime['v'] # => 18 end
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     จࣈྻ require 'phuby' Phuby::Runtime.php do |runtime| runtime.eval "$name = 'Aaron';"

     puts runtime['name'] # => Aaron end
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     ഑ྻ require 'phuby' Phuby::Runtime.php do |runtime| runtime.eval "$cars = array('Toyota',

     'Honda', 'BMW');" p runtime['cars'][0] # => Toyota p runtime['cars'][1] # => Honda p runtime['cars'][2] # => BMW end
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     ࿈૝഑ྻ require 'phuby' Phuby::Runtime.php do |runtime| runtime.eval "$e = array('foo'

     => 'bar', 'bar' => 'baz');" p runtime['e']['foo'] # => 'bar' p runtime['e']['bar'] # => 'baz' end
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     Rubyͷ ΦϒδΣΫτΛ࢖͏

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     Objects require 'phuby' class RubyKaigi def where puts "౦ژ" end

     end Phuby::Runtime.php do |runtime| runtime['kaigi'] = RubyKaigi.new runtime.eval("$kaigi->where();") # => ౦ژ end
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     ͳͥʁ

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     ͍͍͔Β

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     scientists were so preoccupied with whether or not they could

     that they didn't stop to think if they should.
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     ϓϩάϥϜͷମܕ

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     Runtime Proxy Object Map Ruby Object Proxy PHP Object Proxy

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     Wrapper Access PHP Objects Ruby C PHP Object Map Ruby

     Proxy PHP Runtime Object
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     Wrapper Access Ruby Objects Ruby C PHP Object Map Ruby

     Proxy PHP Runtime Object
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     ϓϩδΣΫτͷ ໰୊

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     PHPΛ ίϯύΠϧ͢Δ

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     GC

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     άϩʔόϧͷม਺

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     ໰୊ require 'phuby' require 'openssl' p OpenSSL::Cipher.ciphers # => ["AES-128-CBC",

     "AES-128-CBC-HMAC-SHA1", ... ] Phuby::Runtime.php do |runtime| runtime.eval("$hi = 'Hello World';") end p OpenSSL::Cipher.ciphers # => []
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     Solution: fork require 'phuby' require 'openssl' p OpenSSL::Cipher.ciphers # =>

     ["AES-128-CBC", "AES-128-CBC-HMAC-SHA1", ... ] Process.waitpid fork { Phuby::Runtime.php do |runtime| runtime.eval("$hi = 'Hello World';") end } p OpenSSL::Cipher.ciphers # => ["AES-128-CBC", "AES-128-CBC-HMAC-SHA1", ... ]
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     Rails Support

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     PHP templates

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     None
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     Πϯελϯεม਺

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     None
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     ActiveRecord΋࢖͑·͢

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     None
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     How much would you pay for this?

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     200ԁ?

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     250ԁ?

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     https://github.com/ tenderlove/phuby FREE!

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     ൿີͷτϐοΫ

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     ko1 said this is a tech conference, so you don’t

     have to tell any jokes
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     So I won’t tell any jokes.

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     ੌ͍ίʔυ How does it work?

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     Homeopathic Optimizations

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     Homeopathy ͱ͸ʁ

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     رऍɻ

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     ௕͗͢Δʂ

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     None
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     None
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     Modern advocates of homeopathy have proposed a concept of "water

     memory", according to which water "remembers" the substances mixed in
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     ਫ͸ هԱग़དྷ·͢

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     ۭന΋ هԱ͢Δࣄ͕Ͱ͖Δʁ

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     YES!

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     σϞͷ࣌ؒ!

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     None
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     Ͳ͏΍ͬͯ ಈ͍ͯΔʁ

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     VM ͸هԱ͢Δ

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     ͦΕ͸ۭന͡Όͳ ͯ͘ɺهԱͩɻ

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     ଞͷಛ௃

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     None
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     ར఺

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     ߴ଎Խ

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     "No code is faster than no code"

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     رऍ͞ΕΕ͹͞ΕΔ΄Ͳ ϓϩάϥϜ͸ΑΓ଎͘ͳ Δ

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     ҡ࣋

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     ίʔυ͸ͳ͍͔Β

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     THANK YOU!!!

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     ࣭໰ʁ