code: def nmb_neurons(self) -> Tuple[int, ...]:
          
          return tuple(numpy.asarray(self._cann.nmb_neurons))
docs: Number of neurons of the hidden layers.
  
          >>> from hydpy import ANN
          >>> ann = ANN(None)
          >>> ann(nmb_inputs=2, nmb_neurons=(2, 1), nmb_outputs=3)
          >>> ann.nmb_neurons
          (2, 1)
          >>> ann.nmb_neurons = (3,)
          >>> ann.nmb_neurons
          (3,)
          >>> del ann.nmb_neurons
          >>> ann.nmb_neurons
          Traceback (most recent call last):
          ...
          hydpy.core.exceptiontools.AttributeNotReady: Attribute `nmb_neurons` \
  of object `ann` has not been prepared so far.