Oh, thanks for pointing that out. I didn’t know documentation defaulted to the development version.
A single example of my input data is just a vector of 17 numerical features. I’m passing in a minibatch of 100 examples, so the final input to the network is should be 100 x 16. The batchnorm layer takes 32 activations from the first layer, which I think is where the 32 in the error message is coming from.