def forward(
        self,
        hidden_states,
        timestep,
        controlnet_cond: torch.Tensor,
        conditioning_scale: float = 1.0,
        encoder_hidden_states=None,
        text_embedding_mask=None,
        encoder_hidden_states_t5=None,
        text_embedding_mask_t5=None,
        image_meta_size=None,
        style=None,
        image_rotary_emb=None,
        return_dict=True,
    ):
        """
        The [`HunyuanDiT2DControlNetModel`] forward method.

        Args:
        hidden_states (`torch.Tensor` of shape `(batch size, dim, height, width)`):
            The input tensor.
        timestep ( `torch.LongTensor`, *optional*):
            Used to indicate denoising step.
        controlnet_cond ( `torch.Tensor` ):
            The conditioning input to ControlNet.
        conditioning_scale ( `float` ):
            Indicate the conditioning scale.
        encoder_hidden_states ( `torch.Tensor` of shape `(batch size, sequence len, embed dims)`, *optional*):
            Conditional embeddings for cross attention layer. This is the output of `BertModel`.
        text_embedding_mask: torch.Tensor
            An attention mask of shape `(batch, key_tokens)` is applied to `encoder_hidden_states`. This is the output
            of `BertModel`.
        encoder_hidden_states_t5 ( `torch.Tensor` of shape `(batch size, sequence len, embed dims)`, *optional*):
            Conditional embeddings for cross attention layer. This is the output of T5 Text Encoder.
        text_embedding_mask_t5: torch.Tensor
            An attention mask of shape `(batch, key_tokens)` is applied to `encoder_hidden_states`. This is the output
            of T5 Text Encoder.
        image_meta_size (torch.Tensor):
            Conditional embedding indicate the image sizes
        style: torch.Tensor:
            Conditional embedding indicate the style
        image_rotary_emb (`torch.Tensor`):
            The image rotary embeddings to apply on query and key tensors during attention calculation.
        return_dict: bool
            Whether to return a dictionary.
        """
        for i, (image, scale, controlnet) in enumerate(zip(controlnet_cond, conditioning_scale, self.nets)):
            block_samples = controlnet(
                hidden_states=hidden_states,
                timestep=timestep,
                controlnet_cond=image,
                conditioning_scale=scale,
                encoder_hidden_states=encoder_hidden_states,
                text_embedding_mask=text_embedding_mask,
                encoder_hidden_states_t5=encoder_hidden_states_t5,
                text_embedding_mask_t5=text_embedding_mask_t5,
                image_meta_size=image_meta_size,
                style=style,
                image_rotary_emb=image_rotary_emb,
                return_dict=return_dict,
            )

            # merge samples
            if i == 0:
                control_block_samples = block_samples
            else:
                control_block_samples = [
                    control_block_sample + block_sample
                    for control_block_sample, block_sample in zip(control_block_samples[0], block_samples[0])
                ]
                control_block_samples = (control_block_samples,)

        return control_block_samples

        The [`HunyuanDiT2DControlNetModel`] forward method.

        Args:
        hidden_states (`torch.Tensor` of shape `(batch size, dim, height, width)`):
            The input tensor.
        timestep ( `torch.LongTensor`, *optional*):
            Used to indicate denoising step.
        controlnet_cond ( `torch.Tensor` ):
            The conditioning input to ControlNet.
        conditioning_scale ( `float` ):
            Indicate the conditioning scale.
        encoder_hidden_states ( `torch.Tensor` of shape `(batch size, sequence len, embed dims)`, *optional*):
            Conditional embeddings for cross attention layer. This is the output of `BertModel`.
        text_embedding_mask: torch.Tensor
            An attention mask of shape `(batch, key_tokens)` is applied to `encoder_hidden_states`. This is the output
            of `BertModel`.
        encoder_hidden_states_t5 ( `torch.Tensor` of shape `(batch size, sequence len, embed dims)`, *optional*):
            Conditional embeddings for cross attention layer. This is the output of T5 Text Encoder.
        text_embedding_mask_t5: torch.Tensor
            An attention mask of shape `(batch, key_tokens)` is applied to `encoder_hidden_states`. This is the output
            of T5 Text Encoder.
        image_meta_size (torch.Tensor):
            Conditional embedding indicate the image sizes
        style: torch.Tensor:
            Conditional embedding indicate the style
        image_rotary_emb (`torch.Tensor`):
            The image rotary embeddings to apply on query and key tensors during attention calculation.
        return_dict: bool
            Whether to return a dictionary.
        
src/diffusers/models/controlnets/controlnet_hunyuan.py