support old pickel files
Merge branch 'master' of github.com:lisa-lab/pylearn2
pep8, removed duplicate definition of CentralWindow class
Changed ZCA.fit() to optionally compute self.inv_P_. Changed ZCA_Database constructor to only compute ZCA.inv_P_ if necessary. pep8.
changed ZCA so that the choice of whether to store the inverse is made in the constructor, not in fit(). Did this because often fit() isn't called directly; it's called by dataset.apply, which doens't know about this option.
ZCA now attempts to use GPU for large matrix multiplications when possible. Falls back to CPU on MemoryError.
pep 8
More tests for yaml_parse + minor cleanup
doc
doc and minor code concisification
doc
Merge pull request #533 from jbornschein/yaml-preproc

More tests for yaml_parse + minor cleanup
Merge pull request #351 from bouthilx/master

Changed ScaledCost class to a helper function
Merge pull request #511 from SuperElectric/zca_efficiency

ZCA efficiency improvements
remove comment that is no longer necessary
Merge pull request #537 from goodfeli/master

remove comment that is no longer necessary
remove commented ipdb code
whitespace
remove deprecated class
remove unused imports