Initial commit.
+ momentum, weight decay in restricted_boltzmann
bugfixes: rbm_epoch loop applied weight decay incorrectly; multi-category labels generated correctly.
bugfixes: rbm_epoch loop applied weight decay incorrectly; multi-category labels generated incorrectly.
bugfixes: rbm_epoch loop applied weight decay incorrectly; multi-category labels generated incorrectly.
bugfixes: rbm_epoch loop applied weight decay incorrectly; multi-category labels generated incorrectly.
bugfixes: rbm_epoch loop applied weight decay incorrectly; multi-category labels generated incorrectly.
bugfixes: rbm_epoch loop applied weight decay incorrectly; multi-category labels generated incorrectly.