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annotate doc/v2_planning/plugin_RP.py @ 1173:a0f178bc9052

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changes during the meeting
author pascanur
date Fri, 17 Sep 2010 16:12:33 -0400
parents 3c2d7c5f0cf7
children fe6c25eb1e37
rev   line source
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1 '''
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2 =================================================
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3 Plugin system for interative algortithm Version B
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4 =================================================
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5
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6 After the meeting (September 16) we sort of stumbled on
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7 two possible versions of the plug-in system. This represents
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8 the second version. It suffered a few changes after seeing
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9 Olivier's code and talking to him.
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10
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11 Concept
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12 =======
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13
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14 The basic idea behind this version is not to have a list of all
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15 possible events, but rather have plugin register to events.By
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16 specifying what plugin listens to which event produced by what
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17 plugin you define a sort of dependency graph. Structuring things
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18 in such a graph might make the script more intuitive when reading.
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19
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20 I will first go through pseudo-code for two example and then enumerate
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21 my insights and concepts on the matter
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22
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23
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24 Example : Producer - Consumer that Guillaume described
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25 ======================================================
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26
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27
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28 .. code-block::
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29 '''
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30 sch = Schedular()
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31
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32 @FnPlugin(sch)
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33 def producer(self,event):
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34 self.fire('stuff', value = 'some text')
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35
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36 @FnPlugin(sch)
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37 def consumer(self,event):
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38 print event.value
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39
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40 @FnPlugin(sch)
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41 def prod_consumer(self,event):
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42 print event.value
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43 self.fire('stuff2', value = 'stuff')
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44
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45 producer.act( on = Event('begin'), when = once() )
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46 producer.act( on = Event('stuff'), when = always() )
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47 consumer.act( on = Event('stuff'), when = always() )
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48 prod_consumer.act( on = Event('stuff'), when = always() )
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49
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50 sch.run()
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51
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52
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53
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54 '''
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55 Example : Logistic regression
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56 =============================
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57
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58 Task description
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59 ----------------
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60
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61 Apply a logistic regression network to some dataset. Use early stopping.
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62 Save the weights everytime a new best score is obtained. Print trainnig score
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63 after each epoch.
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64
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65
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66 Possible script
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67 ---------------
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68
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69 Notes : This would look the same for any other architecture that does not
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70 imply pre-training ( i.e. deep networks). For example the mlp.
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71
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72 .. code-block::
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73 '''
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74
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75 sched = Schedular()
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76
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77 # Data / Model Building :
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78 # I skiped over how to design this part
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79 # though I have some ideas
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80 real_train_data, real_valid_data = load_mnist()
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81 model = logreg()
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82
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83 # Main Plugins ( already provided in the library );
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84 # This wrappers also registers the plugin
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85 train_data = create_data_plugin( sched, data = real_train_data)
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86 train_model = create_train_model(sched, model = model)
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87 validate_model = create_valid_model(sched, model = model, data = valid_data)
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88 early_stopper = create_early_stopper(sched)
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89
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90
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91 # On the fly plugins ( print random stuff); the main difference from my
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92 # FnPlugin from Olivier's version is that it also register the plugin in sched
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93 @FnPlugin(sched)
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94 def print_error(self, event):
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95 if event.type == Event('begin'):
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96 self.value = []
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97 elif event.type == train_model.error():
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98 self.value += [event.value]
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99 else event.type == train_data.eod():
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100 print 'Error :', numpy.mean(self.value)
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101
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102 @FnPlugin(sched)
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103 def save_model(self, event):
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104 if event.type == early_stopper.new_best_error():
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105 cPickle.dump(model.parameters(), open('best_params.pkl','wb'))
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106
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107
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108 # Create the dependency graph describing what does what
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109 train_data.act( on = sched.begin(), when = once() )
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110 train_data.act( on = Event('batch'),
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111 train_data.act( on = train_model.done(), when = always())
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112 train_model.act(on = train_data.batch(), when = always())
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113 validate_model.act(on = train_model.done(), when = every(n=10000))
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114 early_stopper.act(on = validate_model.error(), when = always())
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115 print_error.act( on = train_model.error(), when = always() )
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116 print_error.act( on = train_data.eod(), when = always() )
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117 save_model.act( on = eraly_stopper.new_best_errot(), when = always() )
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118
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119 # Run the entire thing
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120 sched.run()
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121
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122
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123 '''
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124 Notes
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125 =====
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126
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127 * I think we should have a FnPlugin decorator ( exactly like Olivier's) just
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128 that also attaches the new created plugin to the schedule. This way you
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129 can create plugin on the fly ( as long as they are simple functions that
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130 print stuff, or compute simple statitics ).
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131 * I added a method act to a Plugin. You use that to create the dependency
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132 graph ( it could also be named listen to be more plugin like interface)
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133 * Plugins are obtained in 3 ways :
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134 - by wrapping a dataset / model or something similar
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135 - by a function that constructs it from nothing
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136 - by decorating a function
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137 In all cases I would suggest then when creating them you should provide
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138 the schedular as well, and the constructor also registers the plugin
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139
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140 * The plugin concept works well as long as the plugins are a bit towards
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141 heavy duty computation, disregarding printing plugins and such. If you have
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142 many small plugins this system might only introduce an overhead. I would
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143 argue that using theano is restricted to each plugin. Therefore I would
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144 strongly suggest that the architecture to be done outside the schedular
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145 with a different approach.
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146
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147 * I would suggest that the framework to be used only for the training loop
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148 (after you get the adapt function, compute error function) so is more about
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149 the meta-learner, hyper-learner learner level.
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150
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151 * A general remark that I guess everyone will agree on. We should make
f923dddf0bf7 a better version of the script
pascanur
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152 sure that implementing a new plugin is as easy/simple as possible. We
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153 have to hide all the complexity in the schedular ( it is the part of the
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154 code we will not need or we would rarely need to work on).
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155
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156 * I have not went into how to implement the different components, but
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157 following Olivier's code I think that part would be more or less straight
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158 forward.
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159
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160 '''
1153
ae5ba6206fd3 a first draft of pseudo-code for logreg .. using version B (?) approach
Razvan Pascanu <r.pascanu@gmail.com>
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161
ae5ba6206fd3 a first draft of pseudo-code for logreg .. using version B (?) approach
Razvan Pascanu <r.pascanu@gmail.com>
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162
ae5ba6206fd3 a first draft of pseudo-code for logreg .. using version B (?) approach
Razvan Pascanu <r.pascanu@gmail.com>
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163 '''