docs: def clear(self):
          """Delete the history."""
          self.sampler.clear()
          self.samples_list = self._comm.gather(self.sampler.samples, root=0)
          if hasattr(self.sampler, 'weights'):
              self.weights_list = self._comm.gather(self.sampler.weights, root=0)
          else:
              self.weights_list = None