'Retrieves the output tensor(s) of a layer at a given node.
# Arguments
node_index: Integer, index of the node
from which to retrieve the attribute.
E.g. `node_index=0` will correspond to the
first time the layer was called.
# Returns
A tensor (or list of tensors if the layer has multiple outputs).'

def get_output_at(self, node_index):

    return self._get_node_attribute_at_index(node_index, 'output_tensors', 'output')
