Theano/Theano — pull request #1073 by goodfeli (2012-11-16 21:43:20+00:00)
Title: WIP: remove g_cost

The g_cost parameter was always kind of silly, and now is redundant with the more powerful known_grads parameter. This PR removes it, both for simplicity and to avoid bugs where g_cost overrides known_grads or vice versa.