Mercurial > pylearn
diff datasets/MNIST.py @ 470:bd937e845bbb
new stuff: algorithms/logistic_regression, datasets/MNIST
author | James Bergstra <bergstrj@iro.umontreal.ca> |
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date | Wed, 22 Oct 2008 15:56:53 -0400 |
parents | |
children | 45b3eb429c15 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/datasets/MNIST.py Wed Oct 22 15:56:53 2008 -0400 @@ -0,0 +1,31 @@ +""" +Various routines to load/access MNIST data. +""" +from __future__ import absolute_import + +import numpy + +from ..amat import AMat + +default_path = '/u/bergstrj/pub/data/mnist.amat' +"""the location of a file containing mnist data in .amat format""" + + +def head(n=10, path=None): + """Load the first MNIST examples. + + Returns two matrices: x, y. x has N rows of 784 columns. Each row of x represents the + 28x28 grey-scale pixels in raster order. y is a vector of N integers. Each element y[i] + is the label of the i'th row of x. + + """ + path = path if path is not None else default_path + + dat = AMat(path=path, head=n) + + return dat.input, numpy.asarray(dat.target, dtype='int64').reshape(dat.target.shape[0]) + +def all(path=None): + return head(n=None, path=path) + +