ax/modelbridge/array.py [247:260]:
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    def _gen(
        self,
        n: int,
        search_space: SearchSpace,
        pending_observations: Dict[str, List[ObservationFeatures]],
        fixed_features: ObservationFeatures,
        model_gen_options: Optional[TConfig] = None,
        optimization_config: Optional[OptimizationConfig] = None,
    ) -> Tuple[
        List[ObservationFeatures],
        List[float],
        Optional[ObservationFeatures],
        TGenMetadata,
    ]:
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ax/modelbridge/discrete.py [86:99]:
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    def _gen(
        self,
        n: int,
        search_space: SearchSpace,
        pending_observations: Dict[str, List[ObservationFeatures]],
        fixed_features: ObservationFeatures,
        model_gen_options: Optional[TConfig] = None,
        optimization_config: Optional[OptimizationConfig] = None,
    ) -> Tuple[
        List[ObservationFeatures],
        List[float],
        Optional[ObservationFeatures],
        TGenMetadata,
    ]:
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