Mercurial > pylearn

annotate doc/v2_planning/plugin.py @ 1128:03b41a79bd60

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coding_style: Replies to James' questions / comments
author Olivier Delalleau <delallea@iro>
date Wed, 15 Sep 2010 12:06:09 -0400
parents 8cc324f388ba
children a1957faecc9b
rev   line source
1118
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1
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2 import time
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3 from collections import defaultdict
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4
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5 inf = float('inf')
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6
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7 ################
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8 ### SCHEDULE ###
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9 ################
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10
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11 class Schedule(object):
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12 def __add__(self, i):
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13 return OffsetSchedule(self, i)
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14 def __or__(self, s):
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15 return UnionSchedule(self, to_schedule(s))
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16 def __and__(self, s):
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17 return IntersectionSchedule(self, to_schedule(s))
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18 def __sub__(self, i):
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19 return OffsetSchedule(self, -i)
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20 def __ror__(self, s):
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21 return UnionSchedule(to_schedule(s), self)
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22 def __rand__(self, s):
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23 return IntersectionSchedule(to_schedule(s), self)
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24 def __invert__(self):
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25 return NegatedSchedule(self)
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26
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27 def to_schedule(x):
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28 if x in (None, False):
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29 return never
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30 if x is True:
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31 return always
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32 elif isinstance(x, (list, tuple)):
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33 return reduce(UnionSchedule, x)
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34 else:
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35 return x
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36
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37
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38 class ScheduleMix(Schedule):
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39 __n__ = None
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40 def __init__(self, *subschedules):
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41 assert (not self.__n__) or len(subschedules) == self.__n__
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42 self.subschedules = map(to_schedule, subschedules)
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43
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44 class UnionSchedule(ScheduleMix):
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45 def __call__(self, t1, t2):
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46 return any(s(t1, t2) for s in self.subschedules)
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47
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48 class IntersectionSchedule(ScheduleMix):
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49 def __call__(self, t1, t2):
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50 return all(s(t1, t2) for s in self.subschedules)
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51
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52 class DifferenceSchedule(ScheduleMix):
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53 __n__ = 2
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54 def __call__(self, t1, t2):
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55 return self.subschedules[0](t1, t2) and not self.subschedules[1](t1, t2)
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56
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57 class NegatedSchedule(ScheduleMix):
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58 __n__ = 1
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59 def __call__(self, t1, t2):
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60 return not self.subschedules[0](t1, t2)
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61
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62 class OffsetSchedule(Schedule):
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63 def __init__(self, schedule, offset):
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64 self.schedule = schedule
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65 self.offset = offset
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66 def __call__(self, t1, t2):
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67 return self.schedule(t1 - self.offset, t2 - self.offset)
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68
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69
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70 class AlwaysSchedule(Schedule):
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71 def __call__(self, t1, t2):
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72 return True
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73
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74 always = AlwaysSchedule()
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75 never = ~always
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76
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77 class IntervalSchedule(Schedule):
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78 def __init__(self, step, repeat = inf):
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79 self.step = step
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80 self.upper_bound = step * (repeat - 1)
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81 def __call__(self, t1, t2):
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82 if t2 < 0 or t1 > self.upper_bound:
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83 return False
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84 diff = t2 - t1
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85 t1m = t1 % self.step
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86 t2m = t2 % self.step
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87 return (diff >= self.step
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88 or t1m == 0
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89 or t2m == 0
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90 or t1m > t2m)
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91
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92 each = lambda step, repeat = inf: each0(step, repeat) + step
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93 each0 = IntervalSchedule
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94
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95
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96 class RangeSchedule(Schedule):
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97 def __init__(self, low = None, high = None):
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98 self.low = low or -inf
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99 self.high = high or inf
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100 def __call__(self, t1, t2):
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101 return self.low <= t1 <= self.high \
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102 or self.low <= t2 <= self.high
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103
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104 inrange = RangeSchedule
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105
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106
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107 class ListSchedule(Schedule):
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108 def __init__(self, *schedules):
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109 self.schedules = schedules
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110 def __call__(self, t1, t2):
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111 for t in self.schedules:
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112 if t1 <= t <= t2:
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113 return True
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114 return False
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115
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116 at = ListSchedule
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117 at_start = at(-inf)
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118 at_end = at(inf)
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119
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120
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121 ##############
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122 ### RUNNER ###
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123 ##############
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124
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125 class scratchpad:
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126 pass
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127
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128 # # ORIGINAL RUNNER, NO TIMELINES
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129 # def runner(master, plugins):
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130 # """
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131 # master is a function which is in charge of the "this" object. It
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132 # is in charge of updating the t1, t2 and done fields, It must
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133 # take a single argument, this.
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134
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135 # plugins is a list of (schedule, function) pairs. In-between each
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136 # execution of the master function, as well as at the very
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137 # beginning and at the very end, the schedule will be consulted
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138 # for the time range [t1, t2], and if there is a match, the
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139 # function will be called with this as the argument. The order
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140 # in which the functions are provided is respected.
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141
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142 # Note: the reason why we use t1 and t2 instead of just t is that it
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143 # gives the master function the ability to run several iterations at
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144 # once without consulting any plugins. In that situation, t1 and t2
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145 # represent a range, and the schedule must determine if there would
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146 # have been an event in that range (we do not distinguish between a
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147 # single event and multiple events).
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148
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149 # For instance, if one is training using minibatches, one could set
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150 # t1 and t2 to the index of the lower and higher examples, and the
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151 # plugins' schedules would be given according to how many examples
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152 # were seen rather than how many minibatches were processed.
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153
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154 # Another possibility is to use real time - t1 would be the time
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155 # before the execution of the master function, t2 the time after
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156 # (in, say, milliseconds). Then you can define plugins that run
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157 # every second or every minute, but only in-between two training
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158 # iterations.
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159 # """
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160
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161 # this = scratchpad()
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162 # this.t1 = -inf
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163 # this.t2 = -inf
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164 # this.started = False
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165 # this.done = False
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166 # while True:
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167 # for schedule, function in plugins:
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168 # if schedule(this.t1, this.t2):
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169 # function(this)
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170 # if this.done:
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171 # break
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172 # master(this)
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173 # this.started = True
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174 # if this.done:
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175 # break
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176 # this.t1 = inf
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177 # this.t2 = inf
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178 # for schedule, function in plugins:
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179 # if schedule(this.t1, this.t2):
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180 # function(this)
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181
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182
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183
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184
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185 def runner(main, plugins):
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186 """
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187 :param main: A function which must take a single argument,
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188 ``this``. The ``this`` argument contains a settable ``done``
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189 flag indicating whether the iterations should keep going or
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190 not, as well as a flag indicating whether this is the first
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191 time runner() is calling main(). main() may store whatever it
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192 wants in ``this``. It may also add one or more timelines in
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193 ``this.timelines[timeline_name]``, which plugins can exploit.
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194
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195 :param plugins: A list of (schedule, timeline, function)
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196 tuples. In-between each execution of the main function, as
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197 well as at the very beginning and at the very end, the
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198 schedule will be consulted for the time range [t1, t2] from
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199 the appropriate timeline, and if there is a match, the
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200 function will be called with ``this`` as the argument. The
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201 order in which the functions are provided is respected.
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202
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203 For any plugin, the timeline can be
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204 * 'iterations', where t1 == t2 == the iteration number
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205 * 'real_time', where t1 and t2 mark the start of the last
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206 loop and the start of the current loop, in seconds since
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207 the beginning of training (includes time spent in plugins)
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208 * 'algorithm_time', where t1 and t2 mark the start and end
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209 of the last iteration of the main function (does not
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210 include time spent in plugins)
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211 * A main function specific timeline.
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212
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213 At the very beginning, the time for all timelines is
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214 -infinity, at the very end it is +infinity.
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215 """
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216 start_time = time.time()
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217
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218 this = scratchpad()
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219
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220 this.timelines = defaultdict(lambda: [-inf, -inf])
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221 realt = this.timelines['real_time']
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222 algot = this.timelines['algorithm_time']
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223 itert = this.timelines['iterations']
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224
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225 this.started = False
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226 this.done = False
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227
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228 while True:
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229
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230 for schedule, timeline, function in plugins:
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231 if schedule(*this.timelines[timeline]):
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232 function(this)
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233 if this.done:
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234 break
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235
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236 t1 = time.time()
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237 main(this)
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238 t2 = time.time()
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239
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240 if not this.started:
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241 realt[:] = [0, 0]
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242 algot[:] = [0, 0]
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243 itert[:] = [-1, -1]
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244 realt[:] = [realt[1], t2 - start_time]
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245 algot[:] = [algot[1], algot[1] + (t2 - t1)]
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246 itert[:] = [itert[0] + 1, itert[1] + 1]
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247
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248 this.started = True
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249 if this.done:
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250 break
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251
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252 this.timelines = defaultdict(lambda: [inf, inf])
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253
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254 for schedule, timeline, function in plugins:
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255 if schedule(*this.timelines[timeline]):
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diff changeset
256 function(this)
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257
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258
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259
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260
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261
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262 ################
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263 ### SHOWCASE ###
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264 ################
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265
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266 def main(this):
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267 if not this.started:
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268 this.error = 1.0
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269 # note: runner will automatically set this.started to true
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270 else:
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271 this.error /= 1.1
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272
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273
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274 def welcome(this):
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275 print "Let's start!"
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276
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277 def print_iter(this):
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278 print "Now running iteration #%i" % this.timelines['iterations'][0]
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279
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280 def print_error(this):
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281 print "The error rate is %s" % this.error
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282
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283 def maybe_stop(this):
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284 thr = 0.01
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285 if this.error < thr:
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286 print "Error is below the threshold: %s <= %s" % (this.error, thr)
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287 this.done = True
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diff changeset
288
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289 def wait_a_bit(this):
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290 time.sleep(1./37)
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291
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292 def printer(txt):
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293 def f(this):
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294 print txt
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295 return f
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296
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297 def stop_this_madness(this):
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298 this.done = True
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diff changeset
299
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300 def byebye(this):
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301 print "Bye bye!"
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parents:
diff changeset
302
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diff changeset
303 runner(main = main,
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304 plugins = [# At the very beginning, print a welcome message
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parents:
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305 (at_start, 'iterations', welcome),
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306 # Each iteration from 1 to 10 inclusive, OR each multiple of 10
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307 # (except 0 - each() excludes 0, each0() includes it)
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308 # print the error
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309 (inrange(1, 10) | each(10), 'iterations', print_error),
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310 # Each multiple of 10, check for stopping condition
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311 (each(10), 'iterations', maybe_stop),
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312 # At iteration 1000, if we ever get that far, just stop
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313 (at(1000), 'iterations', stop_this_madness),
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314 # Wait a bit
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315 (each(1), 'iterations', wait_a_bit),
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316 # Print bonk each second of real time
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317 (each(1), 'real_time', printer('BONK')),
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318 # Print thunk each second of time in main() (main()
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319 # is too fast, so this does not happen for many
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320 # iterations)
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321 (each(1), 'algorithm_time', printer('THUNK')),
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322 # Announce the next iteration
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323 (each0(1), 'iterations', print_iter),
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324 # At the very end, display a message
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325 (at_end, 'iterations', byebye)])
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326
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327