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comparison nnet_ops.py @ 448:0961d4b56ec5

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Added some documentation
author Joseph Turian <turian@gmail.com>
date Wed, 03 Sep 2008 17:08:54 -0400
parents 0392b666320a
children 2bb67e978c28
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447:0392b666320a 448:0961d4b56ec5
608 def binary_crossentropy(output, target): 608 def binary_crossentropy(output, target):
609 """ 609 """
610 Compute the crossentropy of binary output wrt binary target. 610 Compute the crossentropy of binary output wrt binary target.
611 @note: We do not sum, crossentropy is computed by component. 611 @note: We do not sum, crossentropy is computed by component.
612 @todo: Rewrite as a scalar, and then broadcast to tensor. 612 @todo: Rewrite as a scalar, and then broadcast to tensor.
613 @todo: This is essentially duplicated as cost.cross_entropy
613 """ 614 """
614 return -(target * tensor.log(output) + (1 - target) * tensor.log(1 - output)) 615 return -(target * tensor.log(output) + (1 - target) * tensor.log(1 - output))
615 616
616 617
617 618