Tokyo Ruby Kaigi

My talk from Tokyo Ruby Kaigi

Transcript

1. View Slide

2. ͜Μʹͪ͸ʂ
   

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3. ೔ຊޠೖྗࢼݧ
   

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4. Aaron Patterson
   @tenderlove
   

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5. GitHub
   

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6. ko1: ϓϩάϥϛϯάΛ͍ͯͯ͠ʮ͓͓ɺ
   ੌ͍ίʔυ͕ॻ͚ͨʯʮ͜Ε͸ੌ͍΋ͷ
   Λ࡞ͬͯ͠·ͬͨʯͷΑ͏ͳܦݧͳͲ
   

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7. Me: ʮੌ͍ίʔυʯ
   ͍͍ͬͯͬͨԿͩΖ͏
   

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9. ;ͨͭͷҙຯ
   ڪΖ͍͠ / ා͍
   ૉ੖Β͍͠ / ྑ͍
   

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10. ೋͭͷτϐοΫ
    ڪΖ͍͠ / ා͍:
    PHP
    ૉ੖Β͍͠ / ྑ͍:
    Computer Vision
    ൿີ
    

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11. ੌ͍ίʔυ
    ૉ੖Β͍͠ / ྑ͍
    

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12. ίϯϐϡʔλ
    Ϗδϣϯ
    

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13. ΨϥΫλ͕
    ͍ͬͺ͍
    

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14. Magic The
    Gathering (MtG)ͱ͸
    

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15. Collectible Card
    Game
    

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16. ࢲͷ໰୊ (Χʔυͷத਎)
    • Too many cards
    • Don’t know what they do
    • Are they worth any money?
    • Plus many more!
    

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17. ίϯϐϡʔλʔʹ߹͏
    ໰୊Έ͍ͨ
    Seems like a job for computers!
    

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18. ࢲͷղܾ
    

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19. ਓ޻஌ೳ
    Χϝϥ
    ೣ!
    Ruby!
    

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20. High Level Process
    

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21. ࣸਅΛࡱΔ
    ΧʔυΛൈ͚Δ
    ΧʔυΛ֬ೝ͢Δ
    σʔλΛอଘ͢Δ
    

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22. Χʔυͷೝࣝ
    

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23. श
    ͬͨ
    ਪଌ
    ϓϩϯϓτ
    ڭ͑Δ
    ίʔύε
    

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24. श
    ͬͨ
    ਪଌ
    ϓϩϯϓτ
    ڭ͑Δ
    ίʔύ
    ε
    

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25. ਓ޻஌ೳ
    

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26. σʔλɹϞσϧ
    

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27. Χʔυͷ৘ใ
    

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28. ࣸਅ
    ໊લ
    ਓؾ౓
    ηοτ
    

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29. image belongs_to(:card)
    card has_one(:image)
    

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30. View Slide

31. image belongs_to(:card)
    card has_many(:images)
    

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32. View Slide

33. image habtm(:cards)
    card habmt(:image)
    

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34. ׬શσʔλϞσϧ
    Cards
    Images
    Hashes
    habtm
    has_many
    

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35. ίʔύεͷੜ੒
    

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36. 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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37. 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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38. Me Wizards
    

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39. 1.6GB
    

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40. http://mtgjson.com/
    

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41. ॻ͘લʹ
    άʔάϧͨ͠ํ͕͍͍
    

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42. Χʔυͷೝࣝ
    

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43. ஌֮తϋογϡ
    libphash (gem install phasion)
    

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44. 11998341215223291070 12079686925145871551
    Reference Scanned
    

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45. 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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46. 5622372658725034411 12079686925145871551
    Reference Scanned
    

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47. 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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48. ϋογϡΛ௥Ճ͢Δͱ
    ஌͕ࣝ૿͑Δ
    

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49. ϋʔυ΢ΣΞ
    

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50. View Slide

51. View Slide

52. View Slide

53. ιϑτ΢ΣΞ
    

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

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55. ࡱͬͨࣸਅ
    

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56. View Slide

57. ཉ͍͠Πϝʔδ
    

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58. View Slide

59. Χʔυͷൈ͖ํ
    

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60. ؆୯ͳ8ஈ֊͚ͩ!*
    * ؆୯͡Όͳ͍ɺଟ෼
    

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61. View Slide

62. લॲཧ
    

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63. άϨʔεέʔϧ
    gray = OpenCV.BGR2GRAY img
    

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64. View Slide

65. Τοδݕग़
    canny_img = gray.canny @thresh, @thresh
    http://en.wikipedia.org/wiki/Canny_edge_detector
    

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66. View Slide

67. ྠֲ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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68. ྠֲ
    ݀
    

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69. View Slide

70. Ұ൪େ͖ͳྠֲ
    max = contours.max_by { |c|
    c.contour_area
    }
    

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71. View Slide

72. 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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73. View Slide

74. ಁ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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75. ΠϝʔδΛม׵͢Δ
    new_img = img.warp_perspective transform
    

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76. View Slide

77. ڥք࠲ඪΛઃఆ͢Δ
    new_img.set_roi OpenCV::CvRect.new(0, 0, width, height)
    

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78. View Slide

79. It’s Just That Easy!
    

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

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81. View Slide

82. Կ͕͋Δʁ
    Card.joins(:images)
    .where('images.type' => 'UserImage')
    .group('cards.name')
    .count
    

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83. 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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84. ࠷ߴ:
    

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85. ࠷௿:
    

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86. ϓϩδΣΫτͷ໰୊
    

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87. য఺ͷ࣌ؒ
    

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88. View Slide

89. ࣦഊͷ࣌
    

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90. View Slide

91. ֆ͸ࣅͯΔ
    

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92. View Slide

93. अຐೣ
    

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94. View Slide

95. ར఺
    ઃఆ͸؆୯
    ඞཁϋʔυ΢ΣΞ͸͋·Γͳ͍
    ͍҆
    ΩϟϦϒϨʔτ͠ͳ͍
    

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96. ܽ఺
    ෳࡶͳιϑτ΢ΣΞ
    ࿑ಇ
    ֬ೝͷ஗͞
    

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97. ࠓޙͷ׆ಈ
    

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98. ࣗಈԽ
    

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99. ੌ͍ίʔυ
    ڪΖ͍͠ / ා͍
    

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100. PHP + Ruby
     

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

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102. Examples
     

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103. PHPͷ
     ΦϒδΣΫτΛ࢖͏
     

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104. ਺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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105. จࣈྻ
     require 'phuby'
     Phuby::Runtime.php do |runtime|
     runtime.eval "$name = 'Aaron';"
     puts runtime['name'] # => Aaron
     end
     

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106. ഑ྻ
     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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107. ࿈૝഑ྻ
     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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108. Rubyͷ
     ΦϒδΣΫτΛ࢖͏
     

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109. 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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110. ͳͥʁ
     

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111. ͍͍͔Β
     

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112. scientists were so
     preoccupied with
     whether or not they could
     that they didn't stop to
     think if they should.
     

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113. ϓϩάϥϜͷମܕ
     

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114. Runtime Proxy
     Object Map
     Ruby Object Proxy
     PHP Object Proxy
     

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

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

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117. ϓϩδΣΫτͷ
     ໰୊
     

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118. PHPΛ
     ίϯύΠϧ͢Δ
     

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119. GC
     

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120. άϩʔόϧͷม਺
     

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121. ໰୊
     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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122. 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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123. Rails Support
     

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124. PHP templates
     

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125. View Slide

126. Πϯελϯεม਺
     

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127. View Slide

128. ActiveRecord΋࢖͑·͢
     

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129. View Slide

130. How much would
     you pay for this?
     

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131. 200ԁ?
     

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132. 250ԁ?
     

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

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134. ൿີͷτϐοΫ
     

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135. ko1 said this is a tech
     conference, so you don’t
     have to tell any jokes
     

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136. So I won’t tell any
     jokes.
     

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137. ੌ͍ίʔυ
     How does it work?
     

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138. Homeopathic
     Optimizations
     

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139. Homeopathy
     ͱ͸ʁ
     

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140. رऍɻ
     

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141. ௕͗͢Δʂ
     

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142. View Slide

143. View Slide

144. Modern advocates of homeopathy
     have proposed a concept of "water
     memory", according to which water
     "remembers" the substances
     mixed in
     

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145. ਫ͸
     هԱग़དྷ·͢
     

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146. ۭന΋
     هԱ͢Δࣄ͕Ͱ͖Δʁ
     

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147. YES!
     

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148. σϞͷ࣌ؒ!
     

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149. View Slide

150. Ͳ͏΍ͬͯ
     ಈ͍ͯΔʁ
     

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151. VM ͸هԱ͢Δ
     

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152. ͦΕ͸ۭന͡Όͳ
     ͯ͘ɺهԱͩɻ
     

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153. ଞͷಛ௃
     

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155. ར఺
     

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156. ߴ଎Խ
     

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157. "No code is faster
     than no code"
     

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158. رऍ͞ΕΕ͹͞ΕΔ΄Ͳ
     ϓϩάϥϜ͸ΑΓ଎͘ͳ Δ
     

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159. ҡ࣋
     

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160. ίʔυ͸ͳ͍͔Β
     

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161. THANK YOU!!!
     

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162. ࣭໰ʁ
     

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