nparray = numpy.asarray(train_set_x, dtype=theano.config.floatX)
train_set_x = theano.shared(nparray, borrow=True)
pretraining_fns = dbn.pretraining_functions(train_set_x=train_set_x,
    batch_size=10, k=1)
How to format training/testing sets for Deep Belief neural network