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annotate pylearn/datasets/MNIST.py @ 537:b054271b2504

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new file structure layout, factories, etc.
author James Bergstra <bergstrj@iro.umontreal.ca>
date Wed, 12 Nov 2008 21:57:54 -0500
parents datasets/MNIST.py@58810b63292b
children 16f91ca016b1
rev   line source
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1 """
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2 Various routines to load/access MNIST data.
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3 """
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4 from __future__ import absolute_import
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5
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6 import os
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7 import numpy
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8
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9 from ..io.amat import AMat
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10 from .config import data_root
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11 from .dataset import dataset_factory, Dataset
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13 def head(n=10, path=None):
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14 """Load the first MNIST examples.
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15
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16 Returns two matrices: x, y. x has N rows of 784 columns. Each row of x represents the
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17 28x28 grey-scale pixels in raster order. y is a vector of N integers. Each element y[i]
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18 is the label of the i'th row of x.
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19
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20 """
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21 path = os.path.join(data_root(), 'mnist','mnist_with_header.amat') if path is None else path
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22
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23 dat = AMat(path=path, head=n)
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24
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25 try:
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26 assert dat.input.shape[0] == n
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27 assert dat.target.shape[0] == n
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28 except Exception , e:
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29 raise Exception("failed to read MNIST data", (dat, e))
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30
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31 return dat.input, numpy.asarray(dat.target, dtype='int64').reshape(dat.target.shape[0])
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32
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33 def all(path=None):
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34 return head(n=None, path=path)
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35
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36 def train_valid_test(ntrain=50000, nvalid=10000, ntest=10000, path=None):
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37 all_x, all_targ = head(ntrain+nvalid+ntest, path=path)
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38
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39 rval = Dataset()
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41 rval.train = Dataset.Obj(x=all_x[0:ntrain],
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42 y=all_targ[0:ntrain])
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43 rval.valid = Dataset.Obj(x=all_x[ntrain:ntrain+nvalid],
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44 y=all_targ[ntrain:ntrain+nvalid])
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45 rval.test = Dataset.Obj(x=all_x[ntrain+nvalid:ntrain+nvalid+ntest],
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46 y=all_targ[ntrain+nvalid:ntrain+nvalid+ntest])
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47
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48 rval.n_classes = 10
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49 return rval
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53 @dataset_factory('MNIST')
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54 def mnist_factory(variant="", ntrain=None, nvalid=None, ntest=None):
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55 if variant=="":
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56 return train_valid_test()
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57 elif variant=="1k":
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58 return train_valid_test(ntrain=1000, nvalid=200, ntest=200)
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59 elif variant=="10k":
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60 return train_valid_test(ntrain=10000, nvalid=2000, ntest=2000)
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61 elif variant=="custom":
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62 return train_valid_test(ntrain=ntrain, nvalid=nvalid, ntest=ntest)
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63 else:
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64 raise Exception('Unknown MNIST variant', variant)