code: def load_obsdata(self, idx: int) -> None:
          
          if self._obs_ramflag:
              self.obs[0] = self._obs_array[idx]
          elif self._obs_diskflag:
              raw = self._obs_file.read(8)
              self.obs[0] = struct.unpack('d', raw)
docs: Load the next obs sequence value (of the given index).