docs: def _generate(self):
          """Generates a particle using the creator function.
  
          Notes
          -----
          Position and speed are uniformly randomly seeded within
          allowed bounds. The particle also has speed limit settings
          taken from global values.
  
          Returns
          -------
          part : particle object
              A particle used during optimisation.
          """
          part = creator.Particle(
              [random.uniform(-1, 1)
               for _ in range(len(self.value_means))])
          part.speed = [
              random.uniform(-self.max_speed, self.max_speed)
              for _ in range(len(self.value_means))]
          part.smin = -self.max_speed
          part.smax = self.max_speed
          part.ident = None
          part.neighbours = None
          return part