Mercurial > ift6266

annotate datasets/ftfile.py @ 177:be714ac9bcbd

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Use izip(), not zip() to return a lazy iterator. (datasets)
author Arnaud Bergeron <abergeron@gmail.com>
date Sat, 27 Feb 2010 14:15:11 -0500
parents 954185d6002a
children 938bd350dbf0
rev   line source
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1 from pylearn.io.filetensor import _read_header, _prod
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2 import numpy
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3 from dataset import DataSet
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4 from dsetiter import DataIterator
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5 from itertools import izip
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6
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7 class FTFile(object):
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8 def __init__(self, fname):
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9 r"""
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10 Tests:
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11 >>> f = FTFile('/data/lisa/data/nist/by_class/digits/digits_test_labels.ft')
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12 """
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13 self.file = open(fname, 'rb')
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14 self.magic_t, self.elsize, _, self.dim, _ = _read_header(self.file, False)
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15 self.size = self.dim[0]
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16
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17 def skip(self, num):
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18 r"""
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19 Skips `num` items in the file.
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20
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21 If `num` is negative, skips size-num.
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22
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23 Tests:
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24 >>> f = FTFile('/data/lisa/data/nist/by_class/digits/digits_test_labels.ft')
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25 >>> f.size
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26 58646
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27 >>> f.elsize
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28 4
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29 >>> f.file.tell()
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30 20
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31 >>> f.skip(1000)
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32 >>> f.file.tell()
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33 4020
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34 >>> f.size
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35 57646
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36 >>> f = FTFile('/data/lisa/data/nist/by_class/digits/digits_test_labels.ft')
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37 >>> f.size
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38 58646
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39 >>> f.file.tell()
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40 20
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41 >>> f.skip(-1000)
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42 >>> f.file.tell()
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43 230604
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44 >>> f.size
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45 1000
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46 """
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47 if num < 0:
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48 num += self.size
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49 if num < 0:
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50 raise ValueError('Skipping past the start of the file')
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51 if num >= self.size:
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52 self.size = 0
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53 else:
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54 self.size -= num
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55 f_start = self.file.tell()
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56 self.file.seek(f_start + (self.elsize * _prod(self.dim[1:]) * num))
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57
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58 def read(self, num):
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59 r"""
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60 Reads `num` elements from the file and return the result as a
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61 numpy matrix. Last read is truncated.
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62
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63 Tests:
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64 >>> f = FTFile('/data/lisa/data/nist/by_class/digits/digits_test_labels.ft')
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65 >>> f.read(1)
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66 array([6], dtype=int32)
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67 >>> f.read(10)
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68 array([7, 4, 7, 5, 6, 4, 8, 0, 9, 6], dtype=int32)
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69 >>> f.skip(58630)
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70 >>> f.read(10)
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71 array([9, 2, 4, 2, 8], dtype=int32)
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72 >>> f.read(10)
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73 array([], dtype=int32)
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74 >>> f = FTFile('/data/lisa/data/nist/by_class/digits/digits_test_data.ft')
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75 >>> f.read(1)
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76 array([[0, 0, 0, ..., 0, 0, 0]], dtype=uint8)
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77 """
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78 if num > self.size:
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79 num = self.size
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80 self.dim[0] = num
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81 self.size -= num
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82 return numpy.fromfile(self.file, dtype=self.magic_t, count=_prod(self.dim)).reshape(self.dim)
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83
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84 class FTSource(object):
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85 def __init__(self, file, skip=0, size=None):
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86 r"""
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87 Create a data source from a possible subset of a .ft file.
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88
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89 Parameters:
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90 `file` (string) -- the filename
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91 `skip` (int, optional) -- amount of examples to skip from
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92 the start of the file. If
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93 negative, skips filesize - skip.
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94 `size` (int, optional) -- truncates number of examples
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95 read (after skipping). If
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96 negative truncates to
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97 filesize - size
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98 (also after skipping).
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99
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100 Tests:
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101 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft')
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102 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', size=1000)
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103 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', skip=10)
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104 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', skip=100, size=120)
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105 """
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106 self.file = file
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107 self.skip = skip
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108 self.size = size
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109
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110 def open(self):
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111 r"""
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112 Returns an FTFile that corresponds to this dataset.
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113
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114 Tests:
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115 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft')
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116 >>> f = s.open()
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117 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', size=1)
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118 >>> len(s.open().read(2))
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119 1
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120 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', skip=57646)
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121 >>> s.open().size
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122 1000
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123 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', skip=57646, size=1)
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124 >>> s.open().size
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125 1
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126 >>> s = FTSource('/data/lisa/data/nist/by_class/digits/digits_test_data.ft', size=-10)
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127 >>> s.open().size
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128 58636
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129 """
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130 f = FTFile(self.file)
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131 if self.skip != 0:
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132 f.skip(self.skip)
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133 if self.size is not None and self.size < f.size:
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134 if self.size < 0:
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135 f.size += self.size
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136 else:
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137 f.size = self.size
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138 return f
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139
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140 class FTData(object):
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141 r"""
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142 This is a list of FTSources.
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143 """
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144 def __init__(self, datafiles, labelfiles, skip=0, size=None):
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145 self.inputs = [FTSource(f, skip, size) for f in datafiles]
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146 self.outputs = [FTSource(f, skip, size) for f in labelfiles]
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147
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148 def open_inputs(self):
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149 return [f.open() for f in self.inputs]
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150
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151 def open_outputs(self):
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152 return [f.open() for f in self.outputs]
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153
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154
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155 class FTDataSet(DataSet):
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156 def __init__(self, train_data, train_lbl, test_data, test_lbl, valid_data=None, valid_lbl=None):
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157 r"""
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158 Defines a DataSet from a bunch of files.
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159
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160 Parameters:
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161 `train_data` -- list of train data files
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162 `train_label` -- list of train label files (same length as `train_data`)
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163 `test_data`, `test_labels` -- same thing as train, but for
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164 test. The number of files
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165 can differ from train.
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166 `valid_data`, `valid_labels` -- same thing again for validation.
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167 (optional)
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168
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169 If `valid_data` and `valid_labels` are not supplied then a sample
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170 approximately equal in size to the test set is taken from the train
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171 set.
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172 """
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173 if valid_data is None:
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174 total_valid_size = sum(FTFile(td).size for td in test_data)
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175 valid_size = total_valid_size/len(train_data)
173
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176 self._train = FTData(train_data, train_lbl, size=-valid_size)
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177 self._valid = FTData(train_data, train_lbl, skip=-valid_size)
163
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178 else:
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179 self._train = FTData(train_data, train_lbl)
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180 self._valid = FTData(valid_data, valid_lbl)
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181 self._test = FTData(test_data, test_lbl)
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182
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183 def _return_it(self, batchsize, bufsize, ftdata):
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184 return izip(DataIterator(ftdata.open_inputs(), batchsize, bufsize),
163
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185 DataIterator(ftdata.open_outputs(), batchsize, bufsize))