Mercurial > pylearn
comparison algorithms/sgd.py @ 477:8ff412852d66
added sgd
| author | James Bergstra <bergstrj@iro.umontreal.ca> |
|---|---|
| date | Fri, 24 Oct 2008 13:28:00 -0400 |
| parents | |
| children | fbfd3932fd00 |
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| 475:11e0357f06f4 | 477:8ff412852d66 |
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| 1 | |
| 2 from theano.compile import module | |
| 3 | |
| 4 class StochasticGradientDescent(module.FancyModule): | |
| 5 def __init__(self, params, gparams, lr=None): | |
| 6 super(StochasticGradientDescent, self).__init__() | |
| 7 | |
| 8 self.lr = lr if lr is not None else module.Member(T.dscalar()) | |
| 9 self.params = params | |
| 10 self.gparams = gparams | |
| 11 | |
| 12 self.updates = dict((p, p - self.lr * g) for p, g in zip(self.params, self.gparams)) | |
| 13 |