Method load_state_dict

src/diffusers/training_utils.py:857–903

r""" Loads the ExponentialMovingAverage state. This method is used by accelerate during checkpointing to save the ema state dict. Args: state_dict (dict): EMA state. Should be an object returned from a call to :meth:`state_dict`.

(self, state_dict: dict)

        self.temp_stored_params = None

    def load_state_dict(self, state_dict: dict) -> None:
        r"""
        Loads the ExponentialMovingAverage state. This method is used by accelerate during checkpointing to save the
        ema state dict.

        Args:
            state_dict (dict): EMA state. Should be an object returned
                from a call to :meth:`state_dict`.
        """
        # deepcopy, to be consistent with module API
        state_dict = copy.deepcopy(state_dict)

        self.decay = state_dict.get("decay", self.decay)
        if self.decay < 0.0 or self.decay > 1.0:
            raise ValueError("Decay must be between 0 and 1")

        self.min_decay = state_dict.get("min_decay", self.min_decay)
        if not isinstance(self.min_decay, float):
            raise ValueError("Invalid min_decay")

        self.optimization_step = state_dict.get("optimization_step", self.optimization_step)
        if not isinstance(self.optimization_step, int):
            raise ValueError("Invalid optimization_step")

        self.update_after_step = state_dict.get("update_after_step", self.update_after_step)
        if not isinstance(self.update_after_step, int):
            raise ValueError("Invalid update_after_step")

        self.use_ema_warmup = state_dict.get("use_ema_warmup", self.use_ema_warmup)
        if not isinstance(self.use_ema_warmup, bool):
            raise ValueError("Invalid use_ema_warmup")

        self.inv_gamma = state_dict.get("inv_gamma", self.inv_gamma)
        if not isinstance(self.inv_gamma, (float, int)):
            raise ValueError("Invalid inv_gamma")

        self.power = state_dict.get("power", self.power)
        if not isinstance(self.power, (float, int)):
            raise ValueError("Invalid power")

        shadow_params = state_dict.get("shadow_params", None)
        if shadow_params is not None:
            self.shadow_params = shadow_params
            if not isinstance(self.shadow_params, list):
                raise ValueError("shadow_params must be a list")
            if not all(isinstance(p, torch.Tensor) for p in self.shadow_params):
                raise ValueError("shadow_params must all be Tensors")