Declared X_in as dtype='float32' in autoencoder.py #30
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train_op ran into trouble as default theano.tensor.matrix is of type float64 while all other variables are of type float32.
Replacing
X_in = T.matrix('X_%s' % self.id)byX_in = T.matrix('X_%s' % self.id, dtype='float32')fixes this issue.