Mercurial > ift6266

annotate datasets/dsetiter.py @ 608:456a8fb9829e

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author Yoshua Bengio <bengioy@iro.umontreal.ca>
date Wed, 01 Dec 2010 18:03:11 -0500
parents 1adfafdc3d57
children
rev   line source
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1 import numpy
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2
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3 class DummyFile(object):
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4 def __init__(self, size, shape=()):
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5 self.size = size
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6 self.shape = shape
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7
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8 def read(self, num):
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9 if num > self.size:
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10 num = self.size
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11 self.size -= num
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12 return numpy.zeros((num,)+self.shape)
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13
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14 class DataIterator(object):
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15
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16 def __init__(self, files, batchsize, bufsize=None):
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17 r"""
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18 Makes an iterator which will read examples from `files`
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19 and return them in `batchsize` lots.
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20
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21 Parameters:
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22 files -- list of numpy readers
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23 batchsize -- (int) the size of returned batches
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24 bufsize -- (int, default=None) internal read buffer size.
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25
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26 Tests:
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27 >>> d = DataIterator([DummyFile(930)], 10, 100)
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28 >>> d.batchsize
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29 10
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30 >>> d.bufsize
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31 100
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32 >>> d = DataIterator([DummyFile(1)], 10)
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33 >>> d.batchsize
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34 10
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35 >>> d.bufsize
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36 10000
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37 >>> d = DataIterator([DummyFile(1)], 99)
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38 >>> d.batchsize
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39 99
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40 >>> d.bufsize
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41 9999
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42 >>> d = DataIterator([DummyFile(1)], 10, 121)
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43 >>> d.batchsize
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44 10
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45 >>> d.bufsize
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46 120
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47 >>> d = DataIterator([DummyFile(1)], 10, 1)
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48 >>> d.batchsize
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49 10
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50 >>> d.bufsize
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51 10
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52 >>> d = DataIterator([DummyFile(1)], 2000)
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53 >>> d.batchsize
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54 2000
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55 >>> d.bufsize
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56 20000
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57 >>> d = DataIterator([DummyFile(1)], 2000, 31254)
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58 >>> d.batchsize
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59 2000
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60 >>> d.bufsize
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61 30000
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62 >>> d = DataIterator([DummyFile(1)], 2000, 10)
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63 >>> d.batchsize
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64 2000
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65 >>> d.bufsize
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66 2000
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67 """
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68 self.batchsize = batchsize
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69 if bufsize is None:
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70 self.bufsize = max(10*batchsize, 10000)
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71 else:
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72 self.bufsize = bufsize
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73 self.bufsize -= self.bufsize % self.batchsize
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74 if self.bufsize < self.batchsize:
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75 self.bufsize = self.batchsize
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76 self.files = iter(files)
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77 self.curfile = self.files.next()
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78 self.empty = False
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79 self._fill_buf()
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80
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81 def _fill_buf(self):
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82 r"""
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83 Fill the internal buffer.
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84
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85 Will fill across files in case the current one runs out.
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86
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87 Test:
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88 >>> d = DataIterator([DummyFile(20, (3,2))], 10, 10)
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89 >>> d._fill_buf()
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90 >>> d.curpos
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91 0
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92 >>> len(d.buffer)
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93 10
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94 >>> d = DataIterator([DummyFile(11, (3,2)), DummyFile(9, (3,2))], 10, 10)
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95 >>> d._fill_buf()
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96 >>> len(d.buffer)
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97 10
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98 >>> d._fill_buf()
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99 Traceback (most recent call last):
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100 ...
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101 StopIteration
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102 >>> d = DataIterator([DummyFile(10, (3,2)), DummyFile(9, (3,2))], 10, 10)
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103 >>> d._fill_buf()
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104 >>> len(d.buffer)
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105 9
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106 >>> d._fill_buf()
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107 Traceback (most recent call last):
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108 ...
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109 StopIteration
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110 >>> d = DataIterator([DummyFile(20)], 10, 10)
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111 >>> d._fill_buf()
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112 >>> d.curpos
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113 0
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114 >>> len(d.buffer)
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115 10
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116 >>> d = DataIterator([DummyFile(11), DummyFile(9)], 10, 10)
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117 >>> d._fill_buf()
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118 >>> len(d.buffer)
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119 10
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120 >>> d._fill_buf()
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121 Traceback (most recent call last):
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122 ...
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123 StopIteration
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124 >>> d = DataIterator([DummyFile(10), DummyFile(9)], 10, 10)
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125 >>> d._fill_buf()
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126 >>> len(d.buffer)
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127 9
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128 >>> d._fill_buf()
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129 Traceback (most recent call last):
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130 ...
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131 StopIteration
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132 """
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133 self.buffer = None
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134 if self.empty:
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135 raise StopIteration
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136 buf = self.curfile.read(self.bufsize)
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137
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138 while len(buf) < self.bufsize:
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139 try:
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140 self.curfile = self.files.next()
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141 except StopIteration:
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142 self.empty = True
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143 if len(buf) == 0:
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144 raise
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145 break
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146 tmpbuf = self.curfile.read(self.bufsize - len(buf))
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147 buf = numpy.concatenate([buf, tmpbuf], axis=0)
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148
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149 self.cursize = len(buf)
180
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150 self.buffer = buf
163
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151 self.curpos = 0
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152
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153 def __next__(self):
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154 r"""
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155 Returns the next portion of the dataset.
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156
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157 Test:
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158 >>> d = DataIterator([DummyFile(20)], 10, 20)
179
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159 >>> len(d.next())
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160 10
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161 >>> len(d.next())
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162 10
163
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163 >>> d.next()
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164 Traceback (most recent call last):
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165 ...
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166 StopIteration
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167 >>> d.next()
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168 Traceback (most recent call last):
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169 ...
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170 StopIteration
189
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171 >>> d = DataIterator([DummyFile(13)], 10, 50)
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172 >>> len(d.next())
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173 10
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174 >>> len(d.next())
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175 3
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176 >>> d.next()
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177 Traceback (most recent call last):
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178 ...
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179 StopIteration
163
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180 """
189
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181 if self.curpos >= self.cursize:
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182 self._fill_buf()
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183 res = self.buffer[self.curpos:self.curpos+self.batchsize]
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184 self.curpos += self.batchsize
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185 return res
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186
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187 next = __next__
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188
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189 def __iter__(self):
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190 return self