stablenormal/pipeline_stablenormal.py

# Copyright 2024 Marigold authors, PRS ETH Zurich. All rights reserved.
# Copyright 2024 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# --------------------------------------------------------------------------
# More information and citation instructions are available on the
# --------------------------------------------------------------------------
from dataclasses import dataclass
from typing import Any, Dict, List, Optional, Tuple, Union

import numpy as np
import torch
from PIL import Image
from tqdm.auto import tqdm
from transformers import CLIPImageProcessor, CLIPTextModel, CLIPTokenizer, CLIPVisionModelWithProjection


from diffusers.image_processor import PipelineImageInput
from diffusers.models import (
    AutoencoderKL,
    UNet2DConditionModel,
    ControlNetModel,
)
from diffusers.schedulers import (
    DDIMScheduler
)

from diffusers.utils import (
    BaseOutput,
    logging,
    replace_example_docstring,
)

from diffusers.models.unets.unet_2d_condition import UNet2DConditionOutput

from diffusers.utils import USE_PEFT_BACKEND, BaseOutput, deprecate, logging, scale_lora_layers, unscale_lora_layers



from diffusers.utils.torch_utils import randn_tensor
from diffusers.pipelines.controlnet import StableDiffusionControlNetPipeline
from diffusers.pipelines.pipeline_utils import DiffusionPipeline
from diffusers.pipelines.marigold.marigold_image_processing import MarigoldImageProcessor
from diffusers.pipelines.stable_diffusion.safety_checker import StableDiffusionSafetyChecker
import torch.nn.functional as F

import pdb



logger = logging.get_logger(__name__)  # pylint: disable=invalid-name


EXAMPLE_DOC_STRING = """
Examples:
```py
>>> import diffusers
>>> import torch

>>> pipe = diffusers.MarigoldNormalsPipeline.from_pretrained(
...     "prs-eth/marigold-normals-lcm-v0-1", variant="fp16", torch_dtype=torch.float16
... ).to("cuda")

>>> image = diffusers.utils.load_image("https://marigoldmonodepth.github.io/images/einstein.jpg")
>>> normals = pipe(image)

>>> vis = pipe.image_processor.visualize_normals(normals.prediction)
>>> vis[0].save("einstein_normals.png")
```
"""


@dataclass
class StableNormalOutput(BaseOutput):
    """
    Output class for Marigold monocular normals prediction pipeline.

    Args:
        prediction (`np.ndarray`, `torch.Tensor`):
            Predicted normals with values in the range [-1, 1]. The shape is always $numimages \times 3 \times height
            \times width$, regardless of whether the images were passed as a 4D array or a list.
        uncertainty (`None`, `np.ndarray`, `torch.Tensor`):
            Uncertainty maps computed from the ensemble, with values in the range [0, 1]. The shape is $numimages
            \times 1 \times height \times width$.
        latent (`None`, `torch.Tensor`):
            Latent features corresponding to the predictions, compatible with the `latents` argument of the pipeline.
            The shape is $numimages * numensemble \times 4 \times latentheight \times latentwidth$.
    """

    prediction: Union[np.ndarray, torch.Tensor]
    latent: Union[None, torch.Tensor]


class StableNormalPipeline(StableDiffusionControlNetPipeline):
    """ Pipeline for monocular normals estimation using the Marigold method: https://marigoldmonodepth.github.io.
    Pipeline for text-to-image generation using Stable Diffusion with ControlNet guidance.

    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods
    implemented for all pipelines (downloading, saving, running on a particular device, etc.).

    The pipeline also inherits the following loading methods:
        - [`~loaders.TextualInversionLoaderMixin.load_textual_inversion`] for loading textual inversion embeddings
        - [`~loaders.LoraLoaderMixin.load_lora_weights`] for loading LoRA weights
        - [`~loaders.LoraLoaderMixin.save_lora_weights`] for saving LoRA weights
        - [`~loaders.FromSingleFileMixin.from_single_file`] for loading `.ckpt` files
        - [`~loaders.IPAdapterMixin.load_ip_adapter`] for loading IP Adapters

    Args:
        vae ([`AutoencoderKL`]):
            Variational Auto-Encoder (VAE) model to encode and decode images to and from latent representations.
        text_encoder ([`~transformers.CLIPTextModel`]):
            Frozen text-encoder ([clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14)).
        tokenizer ([`~transformers.CLIPTokenizer`]):
            A `CLIPTokenizer` to tokenize text.
        unet ([`UNet2DConditionModel`]):
            A `UNet2DConditionModel` to denoise the encoded image latents.
        controlnet ([`ControlNetModel`] or `List[ControlNetModel]`):
            Provides additional conditioning to the `unet` during the denoising process. If you set multiple
            ControlNets as a list, the outputs from each ControlNet are added together to create one combined
            additional conditioning.
        scheduler ([`SchedulerMixin`]):
            A scheduler to be used in combination with `unet` to denoise the encoded image latents. Can be one of
            [`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
        safety_checker ([`StableDiffusionSafetyChecker`]):
            Classification module that estimates whether generated images could be considered offensive or harmful.
            Please refer to the [model card](https://huggingface.co/runwayml/stable-diffusion-v1-5) for more details
            about a model's potential harms.
        feature_extractor ([`~transformers.CLIPImageProcessor`]):
            A `CLIPImageProcessor` to extract features from generated images; used as inputs to the `safety_checker`.
    """

    model_cpu_offload_seq = "text_encoder->image_encoder->unet->vae"
    _optional_components = ["safety_checker", "feature_extractor", "image_encoder"]
    _exclude_from_cpu_offload = ["safety_checker"]
    _callback_tensor_inputs = ["latents", "prompt_embeds", "negative_prompt_embeds"]



    def __init__(
        self,
        vae: AutoencoderKL,
        text_encoder: CLIPTextModel,
        tokenizer: CLIPTokenizer,
        unet: UNet2DConditionModel,
        controlnet: Union[ControlNetModel, List[ControlNetModel], Tuple[ControlNetModel]],
        dino_controlnet: Union[ControlNetModel, List[ControlNetModel], Tuple[ControlNetModel]],
        scheduler: Union[DDIMScheduler],
        safety_checker: StableDiffusionSafetyChecker,
        feature_extractor: CLIPImageProcessor,
        image_encoder: CLIPVisionModelWithProjection = None,
        requires_safety_checker: bool = True,
        default_denoising_steps: Optional[int] = 10,
        default_processing_resolution: Optional[int] = 768,
        prompt="The normal map",
        empty_text_embedding=None,
        t_start: Optional[int] = 401,
    ):
        super().__init__(
            vae,
            text_encoder,
            tokenizer,
            unet,
            controlnet,
            scheduler,
            safety_checker,
            feature_extractor,
            image_encoder,
            requires_safety_checker,
                )

        self.register_modules(
            dino_controlnet=dino_controlnet,
        )

        self.vae_scale_factor = 768
        self.image_processor = MarigoldImageProcessor(vae_scale_factor=self.vae_scale_factor)
        self.dino_image_processor = lambda x: x / 127.5 -1.

        self.default_denoising_steps = default_denoising_steps
        self.default_processing_resolution = default_processing_resolution
        self.prompt = prompt
        self.prompt_embeds = None
        self.empty_text_embedding = empty_text_embedding
        self.t_start= torch.tensor(t_start) # target_out latents


    def check_inputs(
        self,
        image: PipelineImageInput,
        num_inference_steps: int,
        ensemble_size: int,
        processing_resolution: int,
        resample_method_input: str,
        resample_method_output: str,
        batch_size: int,
        ensembling_kwargs: Optional[Dict[str, Any]],
        latents: Optional[torch.Tensor],
        generator: Optional[Union[torch.Generator, List[torch.Generator]]],
        output_type: str,
        output_uncertainty: bool,
    ) -> int:
        if num_inference_steps is None:
            raise ValueError("`num_inference_steps` is not specified and could not be resolved from the model config.")
        if num_inference_steps < 1:
            raise ValueError("`num_inference_steps` must be positive.")
        if ensemble_size < 1:
            raise ValueError("`ensemble_size` must be positive.")
        if ensemble_size == 2:
            logger.warning(
                "`ensemble_size` == 2 results are similar to no ensembling (1); "
                "consider increasing the value to at least 3."
            )
        if ensemble_size == 1 and output_uncertainty:
            raise ValueError(
                "Computing uncertainty by setting `output_uncertainty=True` also requires setting `ensemble_size` "
                "greater than 1."
            )
        if processing_resolution is None:
            raise ValueError(
                "`processing_resolution` is not specified and could not be resolved from the model config."
            )
        if processing_resolution < 0:
            raise ValueError(
                "`processing_resolution` must be non-negative: 0 for native resolution, or any positive value for "
                "downsampled processing."
            )
        if processing_resolution % self.vae_scale_factor != 0:
            raise ValueError(f"`processing_resolution` must be a multiple of {self.vae_scale_factor}.")
        if resample_method_input not in ("nearest", "nearest-exact", "bilinear", "bicubic", "area"):
            raise ValueError(
                "`resample_method_input` takes string values compatible with PIL library: "
                "nearest, nearest-exact, bilinear, bicubic, area."
            )
        if resample_method_output not in ("nearest", "nearest-exact", "bilinear", "bicubic", "area"):
            raise ValueError(
                "`resample_method_output` takes string values compatible with PIL library: "
                "nearest, nearest-exact, bilinear, bicubic, area."
            )
        if batch_size < 1:
            raise ValueError("`batch_size` must be positive.")
        if output_type not in ["pt", "np"]:
            raise ValueError("`output_type` must be one of `pt` or `np`.")
        if latents is not None and generator is not None:
            raise ValueError("`latents` and `generator` cannot be used together.")
        if ensembling_kwargs is not None:
            if not isinstance(ensembling_kwargs, dict):
                raise ValueError("`ensembling_kwargs` must be a dictionary.")
            if "reduction" in ensembling_kwargs and ensembling_kwargs["reduction"] not in ("closest", "mean"):
                raise ValueError("`ensembling_kwargs['reduction']` can be either `'closest'` or `'mean'`.")

        # image checks
        num_images = 0
        W, H = None, None
        if not isinstance(image, list):
            image = [image]
        for i, img in enumerate(image):
            if isinstance(img, np.ndarray) or torch.is_tensor(img):
                if img.ndim not in (2, 3, 4):
                    raise ValueError(f"`image[{i}]` has unsupported dimensions or shape: {img.shape}.")
                H_i, W_i = img.shape[-2:]
                N_i = 1
                if img.ndim == 4:
                    N_i = img.shape[0]
            elif isinstance(img, Image.Image):
                W_i, H_i = img.size
                N_i = 1
            else:
                raise ValueError(f"Unsupported `image[{i}]` type: {type(img)}.")
            if W is None:
                W, H = W_i, H_i
            elif (W, H) != (W_i, H_i):
                raise ValueError(
                    f"Input `image[{i}]` has incompatible dimensions {(W_i, H_i)} with the previous images {(W, H)}"
                )
            num_images += N_i

        # latents checks
        if latents is not None:
            if not torch.is_tensor(latents):
                raise ValueError("`latents` must be a torch.Tensor.")
            if latents.dim() != 4:
                raise ValueError(f"`latents` has unsupported dimensions or shape: {latents.shape}.")

            if processing_resolution > 0:
                max_orig = max(H, W)
                new_H = H * processing_resolution // max_orig
                new_W = W * processing_resolution // max_orig
                if new_H == 0 or new_W == 0:
                    raise ValueError(f"Extreme aspect ratio of the input image: [{W} x {H}]")
                W, H = new_W, new_H
            w = (W + self.vae_scale_factor - 1) // self.vae_scale_factor
            h = (H + self.vae_scale_factor - 1) // self.vae_scale_factor
            shape_expected = (num_images * ensemble_size, self.vae.config.latent_channels, h, w)

            if latents.shape != shape_expected:
                raise ValueError(f"`latents` has unexpected shape={latents.shape} expected={shape_expected}.")

        # generator checks
        if generator is not None:
            if isinstance(generator, list):
                if len(generator) != num_images * ensemble_size:
                    raise ValueError(
                        "The number of generators must match the total number of ensemble members for all input images."
                    )
                if not all(g.device.type == generator[0].device.type for g in generator):
                    raise ValueError("`generator` device placement is not consistent in the list.")
            elif not isinstance(generator, torch.Generator):
                raise ValueError(f"Unsupported generator type: {type(generator)}.")

        return num_images

    def progress_bar(self, iterable=None, total=None, desc=None, leave=True):
        if not hasattr(self, "_progress_bar_config"):
            self._progress_bar_config = {}
        elif not isinstance(self._progress_bar_config, dict):
            raise ValueError(
                f"`self._progress_bar_config` should be of type `dict`, but is {type(self._progress_bar_config)}."
            )

        progress_bar_config = dict(**self._progress_bar_config)
        progress_bar_config["desc"] = progress_bar_config.get("desc", desc)
        progress_bar_config["leave"] = progress_bar_config.get("leave", leave)
        if iterable is not None:
            return tqdm(iterable, **progress_bar_config)
        elif total is not None:
            return tqdm(total=total, **progress_bar_config)
        else:
            raise ValueError("Either `total` or `iterable` has to be defined.")

    @torch.no_grad()
    @replace_example_docstring(EXAMPLE_DOC_STRING)
    def __call__(
        self,
        image: PipelineImageInput,
        prompt: Union[str, List[str]] = None,
        negative_prompt: Optional[Union[str, List[str]]] = None,
        num_inference_steps: Optional[int] = None,
        ensemble_size: int = 1,
        processing_resolution: Optional[int] = None,
        return_intermediate_result: bool = False,
        match_input_resolution: bool = True,
        resample_method_input: str = "bilinear",
        resample_method_output: str = "bilinear",
        batch_size: int = 1,
        ensembling_kwargs: Optional[Dict[str, Any]] = None,
        latents: Optional[Union[torch.Tensor, List[torch.Tensor]]] = None,
        prompt_embeds: Optional[torch.Tensor] = None,
        negative_prompt_embeds: Optional[torch.Tensor] = None,
        num_images_per_prompt: Optional[int] = 1,
        generator: Optional[Union[torch.Generator, List[torch.Generator]]] = None,
        controlnet_conditioning_scale: Union[float, List[float]] = 1.0,
        output_type: str = "np",
        output_uncertainty: bool = False,
        output_latent: bool = False,
        return_dict: bool = True,
    ):
        """
        Function invoked when calling the pipeline.

        Args:
            image (`PIL.Image.Image`, `np.ndarray`, `torch.Tensor`, `List[PIL.Image.Image]`, `List[np.ndarray]`),
                `List[torch.Tensor]`: An input image or images used as an input for the normals estimation task. For
                arrays and tensors, the expected value range is between `[0, 1]`. Passing a batch of images is possible
                by providing a four-dimensional array or a tensor. Additionally, a list of images of two- or
                three-dimensional arrays or tensors can be passed. In the latter case, all list elements must have the
                same width and height.
            num_inference_steps (`int`, *optional*, defaults to `None`):
                Number of denoising diffusion steps during inference. The default value `None` results in automatic
                selection. The number of steps should be at least 10 with the full Marigold models, and between 1 and 4
                for Marigold-LCM models.
            ensemble_size (`int`, defaults to `1`):
                Number of ensemble predictions. Recommended values are 5 and higher for better precision, or 1 for
                faster inference.
            processing_resolution (`int`, *optional*, defaults to `None`):
                Effective processing resolution. When set to `0`, matches the larger input image dimension. This
                produces crisper predictions, but may also lead to the overall loss of global context. The default
                value `None` resolves to the optimal value from the model config.
            match_input_resolution (`bool`, *optional*, defaults to `True`):
                When enabled, the output prediction is resized to match the input dimensions. When disabled, the longer
                side of the output will equal to `processing_resolution`.
            resample_method_input (`str`, *optional*, defaults to `"bilinear"`):
                Resampling method used to resize input images to `processing_resolution`. The accepted values are:
                `"nearest"`, `"nearest-exact"`, `"bilinear"`, `"bicubic"`, or `"area"`.
            resample_method_output (`str`, *optional*, defaults to `"bilinear"`):
                Resampling method used to resize output predictions to match the input resolution. The accepted values
                are `"nearest"`, `"nearest-exact"`, `"bilinear"`, `"bicubic"`, or `"area"`.
            batch_size (`int`, *optional*, defaults to `1`):
                Batch size; only matters when setting `ensemble_size` or passing a tensor of images.
            ensembling_kwargs (`dict`, *optional*, defaults to `None`)
                Extra dictionary with arguments for precise ensembling control. The following options are available:
                - reduction (`str`, *optional*, defaults to `"closest"`): Defines the ensembling function applied in
                  every pixel location, can be either `"closest"` or `"mean"`.
            latents (`torch.Tensor`, *optional*, defaults to `None`):
                Latent noise tensors to replace the random initialization. These can be taken from the previous
                function call's output.
            generator (`torch.Generator`, or `List[torch.Generator]`, *optional*, defaults to `None`):
                Random number generator object to ensure reproducibility.
            output_type (`str`, *optional*, defaults to `"np"`):
                Preferred format of the output's `prediction` and the optional `uncertainty` fields. The accepted
                values are: `"np"` (numpy array) or `"pt"` (torch tensor).
            output_uncertainty (`bool`, *optional*, defaults to `False`):
                When enabled, the output's `uncertainty` field contains the predictive uncertainty map, provided that
                the `ensemble_size` argument is set to a value above 2.
            output_latent (`bool`, *optional*, defaults to `False`):
                When enabled, the output's `latent` field contains the latent codes corresponding to the predictions
                within the ensemble. These codes can be saved, modified, and used for subsequent calls with the
                `latents` argument.
            return_dict (`bool`, *optional*, defaults to `True`):
                Whether or not to return a [`~pipelines.marigold.MarigoldDepthOutput`] instead of a plain tuple.

        Examples:

        Returns:
            [`~pipelines.marigold.MarigoldNormalsOutput`] or `tuple`:
                If `return_dict` is `True`, [`~pipelines.marigold.MarigoldNormalsOutput`] is returned, otherwise a
                `tuple` is returned where the first element is the prediction, the second element is the uncertainty
                (or `None`), and the third is the latent (or `None`).
        """

        # 0. Resolving variables.
        device = self._execution_device
        dtype = self.dtype

        # Model-specific optimal default values leading to fast and reasonable results.
        if num_inference_steps is None:
            num_inference_steps = self.default_denoising_steps
        if processing_resolution is None:
            processing_resolution = self.default_processing_resolution


        image, padding, original_resolution = self.image_processor.preprocess(
            image, processing_resolution, resample_method_input, device, dtype
        )  # [N,3,PPH,PPW]

        # 0. X_start latent obtain
        predictor = self.x_start_pipeline(image, skip_preprocess=True)
        x_start_latent = predictor.latent
        gauss_latent = predictor.gauss_latent

        # 1. Check inputs.
        num_images = self.check_inputs(
            image,
            num_inference_steps,
            ensemble_size,
            processing_resolution,
            resample_method_input,
            resample_method_output,
            batch_size,
            ensembling_kwargs,
            latents,
            generator,
            output_type,
            output_uncertainty,
        )


        # 2. Prepare empty text conditioning.
        # Model invocation: self.tokenizer, self.text_encoder.
        if self.empty_text_embedding is None:
            prompt = ""
            text_inputs = self.tokenizer(
                prompt,
                padding="do_not_pad",
                max_length=self.tokenizer.model_max_length,
                truncation=True,
                return_tensors="pt",
            )
            text_input_ids = text_inputs.input_ids.to(device)
            self.empty_text_embedding = self.text_encoder(text_input_ids)[0]  # [1,2,1024]



        # 3. prepare prompt
        if self.prompt_embeds is None:
            prompt_embeds, negative_prompt_embeds = self.encode_prompt(
                self.prompt,
                device,
                num_images_per_prompt,
                False,
                negative_prompt,
                prompt_embeds=prompt_embeds,
                negative_prompt_embeds=None,
                lora_scale=None,
                clip_skip=None,
            )
            self.prompt_embeds = prompt_embeds
            self.negative_prompt_embeds = negative_prompt_embeds



        # 5. dino guider features obtaining
        ## TODO different case-1
        dino_features = self.prior(image)
        dino_features = self.dino_controlnet.dino_controlnet_cond_embedding(dino_features)
        dino_features = self.match_noisy(dino_features, x_start_latent)

        # 6. Encode input image into latent space. At this step, each of the `N` input images is represented with `E`
        # ensemble members. Each ensemble member is an independent diffused prediction, just initialized independently.
        # Latents of each such predictions across all input images and all ensemble members are represented in the
        # `pred_latent` variable. The variable `image_latent` is of the same shape: it contains each input image encoded
        # into latent space and replicated `E` times. The latents can be either generated (see `generator` to ensure
        # reproducibility), or passed explicitly via the `latents` argument. The latter can be set outside the pipeline
        # code. For example, in the Marigold-LCM video processing demo, the latents initialization of a frame is taken
        # as a convex combination of the latents output of the pipeline for the previous frame and a newly-sampled
        # noise. This behavior can be achieved by setting the `output_latent` argument to `True`. The latent space
        # dimensions are `(h, w)`. Encoding into latent space happens in batches of size `batch_size`.
        # Model invocation: self.vae.encoder.
        image_latent, pred_latent = self.prepare_latents(
            image, latents, generator, ensemble_size, batch_size
        )  # [N*E,4,h,w], [N*E,4,h,w]


        del (
                image,
        )

        # 7. denoise sampling, using heuritic sampling proposed by Ye.
        self.scheduler.set_timesteps(num_inference_steps, device=device)

        cond_scale =controlnet_conditioning_scale
        pred_latent = x_start_latent

        cur_step = 0

        # dino controlnet
        dino_down_block_res_samples, dino_mid_block_res_sample = self.dino_controlnet(
            dino_features.detach(),
            0, # not depend on time steps
            encoder_hidden_states=self.prompt_embeds,
            conditioning_scale=cond_scale,
            guess_mode=False,
            return_dict=False,
        )
        assert dino_mid_block_res_sample == None

        pred_latents = []

        down_block_res_samples, mid_block_res_sample = self.controlnet(
            image_latent.detach(),
            self.t_start,
            encoder_hidden_states=self.prompt_embeds,
            conditioning_scale=cond_scale,
            guess_mode=False,
            return_dict=False,
        )
        last_pred_latent = pred_latent
        for i in range(4):
            _dino_down_block_res_samples = [dino_down_block_res_sample for dino_down_block_res_sample in dino_down_block_res_samples]  # copy, avoid repeat quiery
            
            model_output = self.dino_unet_forward(
                self.unet,
                pred_latent,
                self.t_start,
                encoder_hidden_states=self.prompt_embeds,
                down_block_additional_residuals=down_block_res_samples,
                mid_block_additional_residual=mid_block_res_sample,
                dino_down_block_additional_residuals= _dino_down_block_res_samples,
                return_dict=False,
            )[0]  # [B,4,h,w]
            pred_latents.append(model_output)
            pred_latent = self.scheduler.add_noise(model_output, gauss_latent, self.t_start)
            pred_latent = 0.4 * pred_latent + 0.6 * last_pred_latent
            last_pred_latent = pred_latent
        pred_latents = torch.cat(pred_latents, dim=0)
        del (
            image_latent,
            dino_features,
        )


        # decoder
        if return_intermediate_result:
            prediction = []
            for _pred_latent in pred_latents:
                _prediction = self.decode_prediction(_pred_latent.unsqueeze(dim=0))
                prediction.append(_prediction)
            prediction = torch.cat(prediction, dim=0)
        else:
            prediction = self.decode_prediction(pred_latents[-1].unsqueeze(dim=0))
        prediction = self.image_processor.unpad_image(prediction, padding)  # [N*E,3,PH,PW]
        
        if match_input_resolution:
            prediction = self.image_processor.resize_antialias(
                prediction, original_resolution, resample_method_output, is_aa=False
            )  # [N,3,H,W]
        prediction = self.normalize_normals(prediction)  # [N,3,H,W]

        if output_type == "np":
            prediction = self.image_processor.pt_to_numpy(prediction)  # [N,H,W,3]
            prediction = prediction.clip(min=-1, max=1)

        # 11. Offload all models
        self.maybe_free_model_hooks()

        return StableNormalOutput(
            prediction=prediction,
            latent=pred_latent,
        )

    # Copied from diffusers.pipelines.marigold.pipeline_marigold_depth.MarigoldDepthPipeline.prepare_latents
    def prepare_latents(
        self,
        image: torch.Tensor,
        latents: Optional[torch.Tensor],
        generator: Optional[torch.Generator],
        ensemble_size: int,
        batch_size: int,
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        def retrieve_latents(encoder_output):
            if hasattr(encoder_output, "latent_dist"):
                return encoder_output.latent_dist.mode()
            elif hasattr(encoder_output, "latents"):
                return encoder_output.latents
            else:
                raise AttributeError("Could not access latents of provided encoder_output")



        image_latent = torch.cat(
            [
                retrieve_latents(self.vae.encode(image[i : i + batch_size]))
                for i in range(0, image.shape[0], batch_size)
            ],
            dim=0,
        )  # [N,4,h,w]
        image_latent = image_latent * self.vae.config.scaling_factor
        image_latent = image_latent.repeat_interleave(ensemble_size, dim=0)  # [N*E,4,h,w]

        pred_latent = latents
        if pred_latent is None:


            pred_latent = randn_tensor(
                image_latent.shape,
                generator=generator,
                device=image_latent.device,
                dtype=image_latent.dtype,
            )  # [N*E,4,h,w]

        return image_latent, pred_latent

    def decode_prediction(self, pred_latent: torch.Tensor) -> torch.Tensor:
        if pred_latent.dim() != 4 or pred_latent.shape[1] != self.vae.config.latent_channels:
            raise ValueError(
                f"Expecting 4D tensor of shape [B,{self.vae.config.latent_channels},H,W]; got {pred_latent.shape}."
            )

        prediction = self.vae.decode(pred_latent / self.vae.config.scaling_factor, return_dict=False)[0]  # [B,3,H,W]

        return prediction  # [B,3,H,W]

    @staticmethod
    def normalize_normals(normals: torch.Tensor, eps: float = 1e-6) -> torch.Tensor:
        if normals.dim() != 4 or normals.shape[1] != 3:
            raise ValueError(f"Expecting 4D tensor of shape [B,3,H,W]; got {normals.shape}.")

        norm = torch.norm(normals, dim=1, keepdim=True)
        normals /= norm.clamp(min=eps)

        return normals

    @staticmethod
    def match_noisy(dino, noisy):
        _, __, dino_h, dino_w =  dino.shape
        _, __, h, w =  noisy.shape

        if h == dino_h and w == dino_w:
            return dino
        else:
            return F.interpolate(dino, (h, w), mode='bilinear')










    @staticmethod
    def dino_unet_forward(
        self,  # NOTE that repurpose to UNet
        sample: torch.Tensor,
        timestep: Union[torch.Tensor, float, int],
        encoder_hidden_states: torch.Tensor,
        class_labels: Optional[torch.Tensor] = None,
        timestep_cond: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        cross_attention_kwargs: Optional[Dict[str, Any]] = None,
        added_cond_kwargs: Optional[Dict[str, torch.Tensor]] = None,
        down_block_additional_residuals: Optional[Tuple[torch.Tensor]] = None,
        mid_block_additional_residual: Optional[torch.Tensor] = None,
        dino_down_block_additional_residuals: Optional[torch.Tensor] = None,
        down_intrablock_additional_residuals: Optional[Tuple[torch.Tensor]] = None,
        encoder_attention_mask: Optional[torch.Tensor] = None,
        return_dict: bool = True,
    ) -> Union[UNet2DConditionOutput, Tuple]:
        r"""
        The [`UNet2DConditionModel`] forward method.

        Args:
            sample (`torch.Tensor`):
                The noisy input tensor with the following shape `(batch, channel, height, width)`.
            timestep (`torch.Tensor` or `float` or `int`): The number of timesteps to denoise an input.
            encoder_hidden_states (`torch.Tensor`):
                The encoder hidden states with shape `(batch, sequence_length, feature_dim)`.
            class_labels (`torch.Tensor`, *optional*, defaults to `None`):
                Optional class labels for conditioning. Their embeddings will be summed with the timestep embeddings.
            timestep_cond: (`torch.Tensor`, *optional*, defaults to `None`):
                Conditional embeddings for timestep. If provided, the embeddings will be summed with the samples passed
                through the `self.time_embedding` layer to obtain the timestep embeddings.
            attention_mask (`torch.Tensor`, *optional*, defaults to `None`):
                An attention mask of shape `(batch, key_tokens)` is applied to `encoder_hidden_states`. If `1` the mask
                is kept, otherwise if `0` it is discarded. Mask will be converted into a bias, which adds large
                negative values to the attention scores corresponding to "discard" tokens.
            cross_attention_kwargs (`dict`, *optional*):
                A kwargs dictionary that if specified is passed along to the `AttentionProcessor` as defined under
                `self.processor` in
                [diffusers.models.attention_processor](https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/attention_processor.py).
            added_cond_kwargs: (`dict`, *optional*):
                A kwargs dictionary containing additional embeddings that if specified are added to the embeddings that
                are passed along to the UNet blocks.
            down_block_additional_residuals: (`tuple` of `torch.Tensor`, *optional*):
                A tuple of tensors that if specified are added to the residuals of down unet blocks.
            mid_block_additional_residual: (`torch.Tensor`, *optional*):
                A tensor that if specified is added to the residual of the middle unet block.
            down_intrablock_additional_residuals (`tuple` of `torch.Tensor`, *optional*):
                additional residuals to be added within UNet down blocks, for example from T2I-Adapter side model(s)
            encoder_attention_mask (`torch.Tensor`):
                A cross-attention mask of shape `(batch, sequence_length)` is applied to `encoder_hidden_states`. If
                `True` the mask is kept, otherwise if `False` it is discarded. Mask will be converted into a bias,
                which adds large negative values to the attention scores corresponding to "discard" tokens.
            return_dict (`bool`, *optional*, defaults to `True`):
                Whether or not to return a [`~models.unets.unet_2d_condition.UNet2DConditionOutput`] instead of a plain
                tuple.

        Returns:
            [`~models.unets.unet_2d_condition.UNet2DConditionOutput`] or `tuple`:
                If `return_dict` is True, an [`~models.unets.unet_2d_condition.UNet2DConditionOutput`] is returned,
                otherwise a `tuple` is returned where the first element is the sample tensor.
        """
        # By default samples have to be AT least a multiple of the overall upsampling factor.
        # The overall upsampling factor is equal to 2 ** (# num of upsampling layers).
        # However, the upsampling interpolation output size can be forced to fit any upsampling size
        # on the fly if necessary.


        default_overall_up_factor = 2**self.num_upsamplers

        # upsample size should be forwarded when sample is not a multiple of `default_overall_up_factor`
        forward_upsample_size = False
        upsample_size = None

        for dim in sample.shape[-2:]:
            if dim % default_overall_up_factor != 0:
                # Forward upsample size to force interpolation output size.
                forward_upsample_size = True
                break

        # ensure attention_mask is a bias, and give it a singleton query_tokens dimension
        # expects mask of shape:
        #   [batch, key_tokens]
        # adds singleton query_tokens dimension:
        #   [batch,                    1, key_tokens]
        # this helps to broadcast it as a bias over attention scores, which will be in one of the following shapes:
        #   [batch,  heads, query_tokens, key_tokens] (e.g. torch sdp attn)
        #   [batch * heads, query_tokens, key_tokens] (e.g. xformers or classic attn)
        if attention_mask is not None:
            # assume that mask is expressed as:
            #   (1 = keep,      0 = discard)
            # convert mask into a bias that can be added to attention scores:
            #       (keep = +0,     discard = -10000.0)
            attention_mask = (1 - attention_mask.to(sample.dtype)) * -10000.0
            attention_mask = attention_mask.unsqueeze(1)

        # convert encoder_attention_mask to a bias the same way we do for attention_mask
        if encoder_attention_mask is not None:
            encoder_attention_mask = (1 - encoder_attention_mask.to(sample.dtype)) * -10000.0
            encoder_attention_mask = encoder_attention_mask.unsqueeze(1)

        # 0. center input if necessary
        if self.config.center_input_sample:
            sample = 2 * sample - 1.0

        # 1. time
        t_emb = self.get_time_embed(sample=sample, timestep=timestep)
        emb = self.time_embedding(t_emb, timestep_cond)
        aug_emb = None

        class_emb = self.get_class_embed(sample=sample, class_labels=class_labels)
        if class_emb is not None:
            if self.config.class_embeddings_concat:
                emb = torch.cat([emb, class_emb], dim=-1)
            else:
                emb = emb + class_emb

        aug_emb = self.get_aug_embed(
            emb=emb, encoder_hidden_states=encoder_hidden_states, added_cond_kwargs=added_cond_kwargs
        )
        if self.config.addition_embed_type == "image_hint":
            aug_emb, hint = aug_emb
            sample = torch.cat([sample, hint], dim=1)

        emb = emb + aug_emb if aug_emb is not None else emb

        if self.time_embed_act is not None:
            emb = self.time_embed_act(emb)

        encoder_hidden_states = self.process_encoder_hidden_states(
            encoder_hidden_states=encoder_hidden_states, added_cond_kwargs=added_cond_kwargs
        )

        # 2. pre-process
        sample = self.conv_in(sample)

        # 2.5 GLIGEN position net
        if cross_attention_kwargs is not None and cross_attention_kwargs.get("gligen", None) is not None:
            cross_attention_kwargs = cross_attention_kwargs.copy()
            gligen_args = cross_attention_kwargs.pop("gligen")
            cross_attention_kwargs["gligen"] = {"objs": self.position_net(**gligen_args)}

        # 3. down
        # we're popping the `scale` instead of getting it because otherwise `scale` will be propagated
        # to the internal blocks and will raise deprecation warnings. this will be confusing for our users.
        if cross_attention_kwargs is not None:
            cross_attention_kwargs = cross_attention_kwargs.copy()
            lora_scale = cross_attention_kwargs.pop("scale", 1.0)
        else:
            lora_scale = 1.0

        if USE_PEFT_BACKEND:
            # weight the lora layers by setting `lora_scale` for each PEFT layer
            scale_lora_layers(self, lora_scale)

        is_controlnet = mid_block_additional_residual is not None and down_block_additional_residuals is not None
        # using new arg down_intrablock_additional_residuals for T2I-Adapters, to distinguish from controlnets
        is_adapter = down_intrablock_additional_residuals is not None
        # maintain backward compatibility for legacy usage, where
        #       T2I-Adapter and ControlNet both use down_block_additional_residuals arg
        #       but can only use one or the other
        if not is_adapter and mid_block_additional_residual is None and down_block_additional_residuals is not None:
            deprecate(
                "T2I should not use down_block_additional_residuals",
                "1.3.0",
                "Passing intrablock residual connections with `down_block_additional_residuals` is deprecated \
                       and will be removed in diffusers 1.3.0.  `down_block_additional_residuals` should only be used \
                       for ControlNet. Please make sure use `down_intrablock_additional_residuals` instead. ",
                standard_warn=False,
            )
            down_intrablock_additional_residuals = down_block_additional_residuals
            is_adapter = True



        def residual_downforward(
            self, hidden_states: torch.Tensor, temb: Optional[torch.Tensor] = None,
            additional_residuals: Optional[torch.Tensor] = None,
            *args, **kwargs,
        ) -> Tuple[torch.Tensor, Tuple[torch.Tensor, ...]]:
            if len(args) > 0 or kwargs.get("scale", None) is not None:
                deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`."
                deprecate("scale", "1.0.0", deprecation_message)

            output_states = ()

            for resnet in self.resnets:
                if self.training and self.gradient_checkpointing:

                    def create_custom_forward(module):
                        def custom_forward(*inputs):
                            return module(*inputs)

                        return custom_forward

                    if is_torch_version(">=", "1.11.0"):
                        hidden_states = torch.utils.checkpoint.checkpoint(
                            create_custom_forward(resnet), hidden_states, temb, use_reentrant=False
                        )
                    else:
                        hidden_states = torch.utils.checkpoint.checkpoint(
                            create_custom_forward(resnet), hidden_states, temb
                        )
                else:
                    hidden_states = resnet(hidden_states, temb)
                    hidden_states += additional_residuals.pop(0)


                output_states = output_states + (hidden_states,)

            if self.downsamplers is not None:
                for downsampler in self.downsamplers:
                    hidden_states = downsampler(hidden_states)
                    hidden_states += additional_residuals.pop(0)

                output_states = output_states + (hidden_states,)

            return hidden_states, output_states


        def residual_blockforward(
            self,  ## NOTE that repurpose to unet_blocks
            hidden_states: torch.Tensor,
            temb: Optional[torch.Tensor] = None,
            encoder_hidden_states: Optional[torch.Tensor] = None,
            attention_mask: Optional[torch.Tensor] = None,
            cross_attention_kwargs: Optional[Dict[str, Any]] = None,
            encoder_attention_mask: Optional[torch.Tensor] = None,
            additional_residuals: Optional[torch.Tensor] = None,
        ) -> Tuple[torch.Tensor, Tuple[torch.Tensor, ...]]:
            if cross_attention_kwargs is not None:
                if cross_attention_kwargs.get("scale", None) is not None:
                    logger.warning("Passing `scale` to `cross_attention_kwargs` is deprecated. `scale` will be ignored.")



            output_states = ()

            blocks = list(zip(self.resnets, self.attentions))

            for i, (resnet, attn) in enumerate(blocks):
                if self.training and self.gradient_checkpointing:

                    def create_custom_forward(module, return_dict=None):
                        def custom_forward(*inputs):
                            if return_dict is not None:
                                return module(*inputs, return_dict=return_dict)
                            else:
                                return module(*inputs)

                        return custom_forward

                    ckpt_kwargs: Dict[str, Any] = {"use_reentrant": False} if is_torch_version(">=", "1.11.0") else {}
                    hidden_states = torch.utils.checkpoint.checkpoint(
                        create_custom_forward(resnet),
                        hidden_states,
                        temb,
                        **ckpt_kwargs,
                    )
                    hidden_states = attn(
                        hidden_states,
                        encoder_hidden_states=encoder_hidden_states,
                        cross_attention_kwargs=cross_attention_kwargs,
                        attention_mask=attention_mask,
                        encoder_attention_mask=encoder_attention_mask,
                        return_dict=False,
                    )[0]
                else:
                    hidden_states = resnet(hidden_states, temb)
                    hidden_states = attn(
                        hidden_states,
                        encoder_hidden_states=encoder_hidden_states,
                        cross_attention_kwargs=cross_attention_kwargs,
                        attention_mask=attention_mask,
                        encoder_attention_mask=encoder_attention_mask,
                        return_dict=False,
                    )[0]

                hidden_states += additional_residuals.pop(0)

                output_states = output_states + (hidden_states,)

            if self.downsamplers is not None:
                for downsampler in self.downsamplers:
                    hidden_states = downsampler(hidden_states)
                    hidden_states += additional_residuals.pop(0)

                output_states = output_states + (hidden_states,)

            return hidden_states, output_states


        down_intrablock_additional_residuals = dino_down_block_additional_residuals

        sample += down_intrablock_additional_residuals.pop(0)
        down_block_res_samples = (sample,)

        for downsample_block in self.down_blocks:
            if hasattr(downsample_block, "has_cross_attention") and downsample_block.has_cross_attention:

                sample, res_samples = residual_blockforward(
                    downsample_block,
                    hidden_states=sample,
                    temb=emb,
                    encoder_hidden_states=encoder_hidden_states,
                    attention_mask=attention_mask,
                    cross_attention_kwargs=cross_attention_kwargs,
                    encoder_attention_mask=encoder_attention_mask,
                    additional_residuals = down_intrablock_additional_residuals,
                )

            else:
                sample, res_samples = residual_downforward(
                    downsample_block,
                    hidden_states=sample,
                    temb=emb,
                    additional_residuals = down_intrablock_additional_residuals,
                        )


            down_block_res_samples += res_samples


        if is_controlnet:
            new_down_block_res_samples = ()

            for down_block_res_sample, down_block_additional_residual in zip(
                down_block_res_samples, down_block_additional_residuals
            ):
                down_block_res_sample = down_block_res_sample + down_block_additional_residual
                new_down_block_res_samples = new_down_block_res_samples + (down_block_res_sample,)

            down_block_res_samples = new_down_block_res_samples

        # 4. mid
        if self.mid_block is not None:
            if hasattr(self.mid_block, "has_cross_attention") and self.mid_block.has_cross_attention:
                sample = self.mid_block(
                    sample,
                    emb,
                    encoder_hidden_states=encoder_hidden_states,
                    attention_mask=attention_mask,
                    cross_attention_kwargs=cross_attention_kwargs,
                    encoder_attention_mask=encoder_attention_mask,
                )
            else:
                sample = self.mid_block(sample, emb)

            # To support T2I-Adapter-XL
            if (
                is_adapter
                and len(down_intrablock_additional_residuals) > 0
                and sample.shape == down_intrablock_additional_residuals[0].shape
            ):
                sample += down_intrablock_additional_residuals.pop(0)

        if is_controlnet:
            sample = sample + mid_block_additional_residual

        # 5. up
        for i, upsample_block in enumerate(self.up_blocks):
            is_final_block = i == len(self.up_blocks) - 1

            res_samples = down_block_res_samples[-len(upsample_block.resnets) :]
            down_block_res_samples = down_block_res_samples[: -len(upsample_block.resnets)]

            # if we have not reached the final block and need to forward the
            # upsample size, we do it here
            if not is_final_block and forward_upsample_size:
                upsample_size = down_block_res_samples[-1].shape[2:]

            if hasattr(upsample_block, "has_cross_attention") and upsample_block.has_cross_attention:
                sample = upsample_block(
                    hidden_states=sample,
                    temb=emb,
                    res_hidden_states_tuple=res_samples,
                    encoder_hidden_states=encoder_hidden_states,
                    cross_attention_kwargs=cross_attention_kwargs,
                    upsample_size=upsample_size,
                    attention_mask=attention_mask,
                    encoder_attention_mask=encoder_attention_mask,
                )
            else:
                sample = upsample_block(
                    hidden_states=sample,
                    temb=emb,
                    res_hidden_states_tuple=res_samples,
                    upsample_size=upsample_size,
                )

        # 6. post-process
        if self.conv_norm_out:
            sample = self.conv_norm_out(sample)
            sample = self.conv_act(sample)
        sample = self.conv_out(sample)

        if USE_PEFT_BACKEND:
            # remove `lora_scale` from each PEFT layer
            unscale_lora_layers(self, lora_scale)

        if not return_dict:
            return (sample,)

        return UNet2DConditionOutput(sample=sample)



    @staticmethod
    def ensemble_normals(
        normals: torch.Tensor, output_uncertainty: bool, reduction: str = "closest"
    ) -> Tuple[torch.Tensor, Optional[torch.Tensor]]:
        """
        Ensembles the normals maps represented by the `normals` tensor with expected shape `(B, 3, H, W)`, where B is
        the number of ensemble members for a given prediction of size `(H x W)`.

        Args:
            normals (`torch.Tensor`):
                Input ensemble normals maps.
            output_uncertainty (`bool`, *optional*, defaults to `False`):
                Whether to output uncertainty map.
            reduction (`str`, *optional*, defaults to `"closest"`):
                Reduction method used to ensemble aligned predictions. The accepted values are: `"closest"` and
                `"mean"`.

        Returns:
            A tensor of aligned and ensembled normals maps with shape `(1, 3, H, W)` and optionally a tensor of
            uncertainties of shape `(1, 1, H, W)`.
        """
        if normals.dim() != 4 or normals.shape[1] != 3:
            raise ValueError(f"Expecting 4D tensor of shape [B,3,H,W]; got {normals.shape}.")
        if reduction not in ("closest", "mean"):
            raise ValueError(f"Unrecognized reduction method: {reduction}.")

        mean_normals = normals.mean(dim=0, keepdim=True)  # [1,3,H,W]
        mean_normals = MarigoldNormalsPipeline.normalize_normals(mean_normals)  # [1,3,H,W]

        sim_cos = (mean_normals * normals).sum(dim=1, keepdim=True)  # [E,1,H,W]
        sim_cos = sim_cos.clamp(-1, 1)  # required to avoid NaN in uncertainty with fp16

        uncertainty = None
        if output_uncertainty:
            uncertainty = sim_cos.arccos()  # [E,1,H,W]
            uncertainty = uncertainty.mean(dim=0, keepdim=True) / np.pi  # [1,1,H,W]

        if reduction == "mean":
            return mean_normals, uncertainty  # [1,3,H,W], [1,1,H,W]

        closest_indices = sim_cos.argmax(dim=0, keepdim=True)  # [1,1,H,W]
        closest_indices = closest_indices.repeat(1, 3, 1, 1)  # [1,3,H,W]
        closest_normals = torch.gather(normals, 0, closest_indices)  # [1,3,H,W]

        return closest_normals, uncertainty  # [1,3,H,W], [1,1,H,W]

# Copied from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion.retrieve_timesteps
def retrieve_timesteps(
    scheduler,
    num_inference_steps: Optional[int] = None,
    device: Optional[Union[str, torch.device]] = None,
    timesteps: Optional[List[int]] = None,
    sigmas: Optional[List[float]] = None,
    **kwargs,
):
    """
    Calls the scheduler's `set_timesteps` method and retrieves timesteps from the scheduler after the call. Handles
    custom timesteps. Any kwargs will be supplied to `scheduler.set_timesteps`.

    Args:
        scheduler (`SchedulerMixin`):
            The scheduler to get timesteps from.
        num_inference_steps (`int`):
            The number of diffusion steps used when generating samples with a pre-trained model. If used, `timesteps`
            must be `None`.
        device (`str` or `torch.device`, *optional*):
            The device to which the timesteps should be moved to. If `None`, the timesteps are not moved.
        timesteps (`List[int]`, *optional*):
            Custom timesteps used to override the timestep spacing strategy of the scheduler. If `timesteps` is passed,
            `num_inference_steps` and `sigmas` must be `None`.
        sigmas (`List[float]`, *optional*):
            Custom sigmas used to override the timestep spacing strategy of the scheduler. If `sigmas` is passed,
            `num_inference_steps` and `timesteps` must be `None`.

    Returns:
        `Tuple[torch.Tensor, int]`: A tuple where the first element is the timestep schedule from the scheduler and the
        second element is the number of inference steps.
    """
    if timesteps is not None and sigmas is not None:
        raise ValueError("Only one of `timesteps` or `sigmas` can be passed. Please choose one to set custom values")
    if timesteps is not None:
        accepts_timesteps = "timesteps" in set(inspect.signature(scheduler.set_timesteps).parameters.keys())
        if not accepts_timesteps:
            raise ValueError(
                f"The current scheduler class {scheduler.__class__}'s `set_timesteps` does not support custom"
                f" timestep schedules. Please check whether you are using the correct scheduler."
            )
        scheduler.set_timesteps(timesteps=timesteps, device=device, **kwargs)
        timesteps = scheduler.timesteps
        num_inference_steps = len(timesteps)
    elif sigmas is not None:
        accept_sigmas = "sigmas" in set(inspect.signature(scheduler.set_timesteps).parameters.keys())
        if not accept_sigmas:
            raise ValueError(
                f"The current scheduler class {scheduler.__class__}'s `set_timesteps` does not support custom"
                f" sigmas schedules. Please check whether you are using the correct scheduler."
            )
        scheduler.set_timesteps(sigmas=sigmas, device=device, **kwargs)
        timesteps = scheduler.timesteps
        num_inference_steps = len(timesteps)
    else:
        scheduler.set_timesteps(num_inference_steps, device=device, **kwargs)
        timesteps = scheduler.timesteps
    return timesteps, num_inference_steps