How to use the robosuite.models.objects.MilkObject function in robosuite

from .BinArena import BinArena
    from robosuite.models.objects import BreadObject, MilkObject, LemonObject, CanObject, BottleObject, CerealObject
    from robosuite.models.robots import Sawyer
    from robosuite.models.tasks import TableTopTask, UniformRandomSampler
    from robosuite.wrappers import IKWrapper
except ImportError:
    print("Robosuite is required to use this module. Please try ' pip install robosuite' ")
    raise ImportError()


def make_sawyer_env(hparams_dict):
    return IKWrapper(SawyerMultiObjEnv(**hparams_dict))


OBJECTS = [BreadObject, MilkObject, LemonObject, CanObject, BottleObject, CerealObject]


class SawyerMultiObjEnv(SawyerEnv):
    """
    This class corresponds to the lifting task for the Sawyer robot arm.
    """

    def __init__(
        self,
        gripper_type="TwoFingerGripper",
        table_full_size=(0.8, 0.8, 0.8),
        table_friction=(1., 5e-3, 1e-4),
        use_camera_obs=True,
        use_object_obs=True,
        reward_shaping=False,
        placement_initializer=None,