class_docstr: Sobol experiment design.
  Uses random design for non-continuous variables, and Sobol sequence for continuous ones
code: def __init__(self, space):
      if space.has_constraints():
          raise InvalidConfigError(
              "Sampling with constraints is not allowed by Sobol design"
          )
      super(SobolDesign, self).__init__(space)
  
imports: import numpy
  from ..core.errors import InvalidConfigError
  from .base import ExperimentDesign
  from .random_design import RandomDesign
label_desc: Use image node_id 1 to create a new SobolDesign object from inherited base classes: ExperimentDesign with example: obj = SobolDesign(space)