'Based on decoder connections, create the list of which layers encoder are
connected to.'

def set_connections(self, decoder_cons):

    cons = []
    for ii in range(len(self._recurrent)):
        l_list = [i_dec for (i_dec, i_enc) in enumerate(decoder_cons) if (i_enc == ii)]
        cons.append(l_list)
    self.connections = cons
