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"""Union of meta Schedule design space generators."""
from typing import List

from tvm._ffi import register_object

from .. import _ffi_api
from .space_generator import (
    MutatorProbType,
    PostprocType,
    ScheduleRuleType,
    SpaceGenerator,
    _normalize_rules,
)


@register_object("meta_schedule.SpaceGeneratorUnion")
class SpaceGeneratorUnion(SpaceGenerator):
    """Union of design space generators."""

    def __init__(
        self,
        space_generators: List[SpaceGenerator],
        sch_rules: ScheduleRuleType = "from-target",
        postprocs: PostprocType = "from-target",
        mutator_probs: MutatorProbType = "from-target",
    ):
        """Constructor.

        Parameters
        ----------
        space_generators : List[SpaceGenerator]
            The list of design space generators to be unioned.
        """
        sch_rules, postprocs, mutator_probs = _normalize_rules(sch_rules, postprocs, mutator_probs)
        self.__init_handle_by_constructor__(
            _ffi_api.SpaceGeneratorSpaceGeneratorUnion,  # type: ignore # pylint: disable=no-member
            space_generators,
            sch_rules,
            postprocs,
            mutator_probs,
        )
