Mercurial > pylearn
changeset 413:f63dfb0ac7dc
Added cost functions
| author | Joseph Turian <turian@iro.umontreal.ca> |
|---|---|
| date | Fri, 11 Jul 2008 15:26:41 -0400 |
| parents | 35b858a1d4fd |
| children | 643dbccde1fc |
| files | cost.py |
| diffstat | 1 files changed, 9 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/cost.py Fri Jul 11 15:26:41 2008 -0400 @@ -0,0 +1,9 @@ +""" +Cost functions. +""" + +def quadratic(target, output, axis=1): + return T.mean(T.sqr(target - output), axis) + +def cross_entropy(target, output, axis=1): + return -T.mean(target * T.log2(output) + (1 - target) * T.log2(1 - output), axis=axis)