code: def _check_min_density(self, min_density):
          
  
          if min_density is None:
              self._min_density = -np.Inf
          elif (isinstance(min_density, float) and (0.0 <= min_density < 1.0)):
              self._min_density = min_density
          else:
              raise ValueError('min_density must be float and be >=0.0 and < 1.0')
docs: Validator to ensure proper usage.