docs: def set_input_data(self, key, value):
          """
          set_input_data will automatically create an input channel if necessary.
          Automatic channel creation is intended for the case where users are trying to set initial values on a block
          whose input channels aren't subscribed to anything in the graph.
          """
          if not key in self.input_channels.keys():
              self.set_input_channel(key, Channel())
          self.input_channels[key].set_value(Data(self.time, value))