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# coding=utf-8
# Copyright 2025 The HuggingFace Inc. team.
#
# 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.
import math
from typing import Any, Optional, Union

import torch
from torch import nn
from torchvision.transforms.v2 import functional as F

from transformers.image_transforms import get_size_with_aspect_ratio

from ...image_processing_utils import BatchFeature, get_size_dict
from ...image_processing_utils_fast import (
    BaseImageProcessorFast,
    SizeDict,
    get_image_size_for_max_height_width,
    get_max_height_width,
    group_images_by_shape,
    reorder_images,
)
from ...image_utils import (
    IMAGENET_DEFAULT_MEAN,
    IMAGENET_DEFAULT_STD,
    ChannelDimension,
    ImageInput,
    PILImageResampling,
)
from ...processing_utils import Unpack
from ...utils import TensorType, auto_docstring, logging
from .image_processing_mask2former import (
    Mask2FormerImageProcessorKwargs,
    compute_segments,
    convert_segmentation_to_rle,
    remove_low_and_no_objects,
)


logger = logging.get_logger(__name__)


def convert_segmentation_map_to_binary_masks_fast(
    segmentation_map: "torch.Tensor",
    instance_id_to_semantic_id: Optional[dict[int, int]] = None,
    ignore_index: Optional[int] = None,
    do_reduce_labels: bool = False,
):
    if do_reduce_labels and ignore_index is None:
        raise ValueError("If `do_reduce_labels` is True, `ignore_index` must be provided.")

    if do_reduce_labels:
        segmentation_map = torch.where(segmentation_map == 0, ignore_index, segmentation_map - 1)

    all_labels = torch.unique(segmentation_map)

    if ignore_index is not None:
        all_labels = all_labels[all_labels != ignore_index]  # drop background label if applicable

    binary_masks = [(segmentation_map == i) for i in all_labels]
    if binary_masks:
        binary_masks = torch.stack(binary_masks, dim=0)
    else:
        binary_masks = torch.zeros((0, *segmentation_map.shape), device=segmentation_map.device)

    # Convert instance ids to class ids
    if instance_id_to_semantic_id is not None:
        labels = torch.zeros(all_labels.shape[0], device=segmentation_map.device)

        for i, label in enumerate(all_labels):
            class_id = instance_id_to_semantic_id[(label.item() + 1 if do_reduce_labels else label.item())]
            labels[i] = class_id - 1 if do_reduce_labels else class_id
    else:
        labels = all_labels
    return binary_masks.float(), labels.long()


@auto_docstring
class Mask2FormerImageProcessorFast(BaseImageProcessorFast):
    resample = PILImageResampling.BILINEAR
    image_mean = IMAGENET_DEFAULT_MEAN
    image_std = IMAGENET_DEFAULT_STD
    size = {"shortest_edge": 800, "longest_edge": 1333}
    default_to_square = False
    do_resize = True
    do_rescale = True
    rescale_factor = 1 / 255
    do_normalize = True
    do_pad = True
    model_input_names = ["pixel_values", "pixel_mask"]
    size_divisor = 32
    do_reduce_labels = False
    valid_kwargs = Mask2FormerImageProcessorKwargs

    def __init__(self, **kwargs: Unpack[Mask2FormerImageProcessorKwargs]) -> None:
        if "pad_and_return_pixel_mask" in kwargs:
            kwargs["do_pad"] = kwargs.pop("pad_and_return_pixel_mask")

        size = kwargs.pop("size", None)
        max_size = kwargs.pop("max_size", None)

        if size is None and max_size is not None:
            size = self.size
            size["longest_edge"] = max_size
        elif size is None:
            size = self.size

        self.size = get_size_dict(size, max_size=max_size, default_to_square=False)

        super().__init__(**kwargs)

    def to_dict(self) -> dict[str, Any]:
        """
        Serializes this instance to a Python dictionary. This method calls the superclass method and then removes the
        `_max_size` attribute from the dictionary.
        """
        image_processor_dict = super().to_dict()
        image_processor_dict.pop("_max_size", None)
        return image_processor_dict

    def reduce_label(self, labels: list["torch.Tensor"]):
        for idx in range(len(labels)):
            label = labels[idx]
            label = torch.where(label == 0, torch.tensor(255, dtype=label.dtype), label)
            label = label - 1
            label = torch.where(label == 254, torch.tensor(255, dtype=label.dtype), label)
            labels[idx] = label

    def resize(
        self,
        image: torch.Tensor,
        size: SizeDict,
        size_divisor: int = 0,
        interpolation: Optional["F.InterpolationMode"] = None,
        **kwargs,
    ) -> torch.Tensor:
        """
        Resize the image to the given size. Size can be `min_size` (scalar) or `(height, width)` tuple. If size is an
        int, smaller edge of the image will be matched to this number.

        Args:
            image (`torch.Tensor`):
                Image to resize.
            size (`SizeDict`):
                Size of the image's `(height, width)` dimensions after resizing. Available options are:
                    - `{"height": int, "width": int}`: The image will be resized to the exact size `(height, width)`.
                        Do NOT keep the aspect ratio.
                    - `{"shortest_edge": int, "longest_edge": int}`: The image will be resized to a maximum size respecting
                        the aspect ratio and keeping the shortest edge less or equal to `shortest_edge` and the longest edge
                        less or equal to `longest_edge`.
                    - `{"max_height": int, "max_width": int}`: The image will be resized to the maximum size respecting the
                        aspect ratio and keeping the height less or equal to `max_height` and the width less or equal to
                        `max_width`.
            size_divisor (`int`, *optional*, defaults to 0):
                If `size_divisor` is given, the output image size will be divisible by the number.
            interpolation (`InterpolationMode`, *optional*, defaults to `InterpolationMode.BILINEAR`):
                Resampling filter to use if resizing the image.
        """
        interpolation = interpolation if interpolation is not None else F.InterpolationMode.BILINEAR
        if size.shortest_edge and size.longest_edge:
            # Resize the image so that the shortest edge or the longest edge is of the given size
            # while maintaining the aspect ratio of the original image.
            new_size = get_size_with_aspect_ratio(
                image.size()[-2:],
                size["shortest_edge"],
                size["longest_edge"],
            )
        elif size.max_height and size.max_width:
            new_size = get_image_size_for_max_height_width(image.size()[-2:], size["max_height"], size["max_width"])
        elif size.height and size.width:
            new_size = (size["height"], size["width"])
        else:
            raise ValueError(
                "Size must contain 'height' and 'width' keys or 'shortest_edge' and 'longest_edge' keys. Got"
                f" {size.keys()}."
            )
        if size_divisor > 0:
            height, width = new_size
            height = int(math.ceil(height / size_divisor) * size_divisor)
            width = int(math.ceil(width / size_divisor) * size_divisor)
            new_size = (height, width)

        image = F.resize(
            image,
            size=new_size,
            interpolation=interpolation,
            **kwargs,
        )
        return image

    def pad(
        self,
        images: torch.Tensor,
        padded_size: tuple[int, int],
        segmentation_maps: Optional[torch.Tensor] = None,
        fill: int = 0,
        ignore_index: int = 255,
    ) -> BatchFeature:
        original_size = images.size()[-2:]
        padding_bottom = padded_size[0] - original_size[0]
        padding_right = padded_size[1] - original_size[1]
        if padding_bottom < 0 or padding_right < 0:
            raise ValueError(
                f"Padding dimensions are negative. Please make sure that the padded size is larger than the "
                f"original size. Got padded size: {padded_size}, original size: {original_size}."
            )
        if original_size != padded_size:
            padding = [0, 0, padding_right, padding_bottom]
            images = F.pad(images, padding, fill=fill)
            if segmentation_maps is not None:
                segmentation_maps = F.pad(segmentation_maps, padding, fill=ignore_index)

        # Make a pixel mask for the image, where 1 indicates a valid pixel and 0 indicates padding.
        pixel_mask = torch.zeros((images.shape[0], *padded_size), dtype=torch.int64, device=images.device)
        pixel_mask[:, : original_size[0], : original_size[1]] = 1

        return images, pixel_mask, segmentation_maps

    @auto_docstring
    def preprocess(
        self,
        images: ImageInput,
        segmentation_maps: Optional[ImageInput] = None,
        instance_id_to_semantic_id: Optional[Union[list[dict[int, int]], dict[int, int]]] = None,
        **kwargs: Unpack[Mask2FormerImageProcessorKwargs],
    ) -> BatchFeature:
        r"""
        segmentation_maps (`ImageInput`, *optional*):
            The segmentation maps.
        instance_id_to_semantic_id (`Union[list[dict[int, int]], dict[int, int]]`, *optional*):
            A mapping from instance IDs to semantic IDs.
        """
        return super().preprocess(
            images,
            segmentation_maps,
            instance_id_to_semantic_id,
            **kwargs,
        )

    def _preprocess_image_like_inputs(
        self,
        images: ImageInput,
        segmentation_maps: ImageInput,
        instance_id_to_semantic_id: Optional[Union[list[dict[int, int]], dict[int, int]]],
        do_convert_rgb: bool,
        input_data_format: ChannelDimension,
        device: Optional[Union[str, "torch.device"]] = None,
        **kwargs: Unpack[Mask2FormerImageProcessorKwargs],
    ) -> BatchFeature:
        """
        Preprocess image-like inputs.
        To be overridden by subclasses when image-like inputs other than images should be processed.
        It can be used for segmentation maps, depth maps, etc.
        """
        # Prepare input images
        images = self._prepare_image_like_inputs(
            images=images, do_convert_rgb=do_convert_rgb, input_data_format=input_data_format, device=device
        )
        if segmentation_maps is not None:
            segmentation_maps = self._prepare_image_like_inputs(
                images=segmentation_maps,
                expected_ndims=2,
                do_convert_rgb=False,
                input_data_format=ChannelDimension.FIRST,
            )
        return self._preprocess(images, segmentation_maps, instance_id_to_semantic_id, **kwargs)

    def _preprocess(
        self,
        images: list["torch.Tensor"],
        segmentation_maps: Optional["torch.Tensor"],
        instance_id_to_semantic_id: Optional[dict[int, int]],
        do_resize: Optional[bool],
        size: Optional[SizeDict],
        pad_size: Optional[SizeDict],
        size_divisor: Optional[int],
        interpolation: Optional[Union["PILImageResampling", "F.InterpolationMode"]],
        do_rescale: Optional[bool],
        rescale_factor: Optional[float],
        do_normalize: Optional[bool],
        image_mean: Optional[Union[float, list[float]]],
        image_std: Optional[Union[float, list[float]]],
        ignore_index: Optional[int],
        do_reduce_labels: Optional[bool],
        disable_grouping: Optional[bool],
        return_tensors: Optional[Union[str, TensorType]],
        **kwargs,
    ) -> BatchFeature:
        if segmentation_maps is not None and len(images) != len(segmentation_maps):
            raise ValueError("Images and segmentation maps must have the same length.")

        # Group images by size for batched resizing
        grouped_images, grouped_images_index = group_images_by_shape(images, disable_grouping=disable_grouping)
        resized_images_grouped = {}
        if segmentation_maps is not None:
            grouped_segmentation_maps, grouped_segmentation_maps_index = group_images_by_shape(
                segmentation_maps, disable_grouping=disable_grouping
            )
            resized_segmentation_maps_grouped = {}
        for shape, stacked_images in grouped_images.items():
            if do_resize:
                stacked_images = self.resize(
                    image=stacked_images, size=size, size_divisor=size_divisor, interpolation=interpolation
                )
                if segmentation_maps is not None:
                    stacked_segmentation_maps = self.resize(
                        image=grouped_segmentation_maps[shape],
                        size=size,
                        size_divisor=size_divisor,
                        interpolation=F.InterpolationMode.NEAREST_EXACT,
                    )
            resized_images_grouped[shape] = stacked_images
            if segmentation_maps is not None:
                resized_segmentation_maps_grouped[shape] = stacked_segmentation_maps
        resized_images = reorder_images(resized_images_grouped, grouped_images_index)
        if segmentation_maps is not None:
            resized_segmentation_maps = reorder_images(
                resized_segmentation_maps_grouped, grouped_segmentation_maps_index
            )
        if pad_size is not None:
            padded_size = (pad_size.height, pad_size.width)
        else:
            padded_size = get_max_height_width(resized_images)

        if segmentation_maps is not None:
            mask_labels = []
            class_labels = []
            # Convert to list of binary masks and labels
            for idx, segmentation_map in enumerate(resized_segmentation_maps):
                if isinstance(instance_id_to_semantic_id, list):
                    instance_id = instance_id_to_semantic_id[idx]
                else:
                    instance_id = instance_id_to_semantic_id
                # Use instance2class_id mapping per image
                masks, classes = convert_segmentation_map_to_binary_masks_fast(
                    segmentation_map.squeeze(0),
                    instance_id,
                    ignore_index=ignore_index,
                    do_reduce_labels=do_reduce_labels,
                )
                mask_labels.append(masks)
                class_labels.append(classes)

        grouped_images, grouped_images_index = group_images_by_shape(resized_images, disable_grouping=disable_grouping)
        processed_images_grouped = {}
        processed_pixel_masks_grouped = {}
        if segmentation_maps is not None:
            grouped_segmentation_maps, grouped_segmentation_maps_index = group_images_by_shape(
                mask_labels, disable_grouping=disable_grouping
            )
            processed_segmentation_maps_grouped = {}
        for shape, stacked_images in grouped_images.items():
            # Fused rescale and normalize
            stacked_images = self.rescale_and_normalize(
                stacked_images, do_rescale, rescale_factor, do_normalize, image_mean, image_std
            )
            padded_images, pixel_masks, padded_segmentation_maps = self.pad(
                images=stacked_images,
                segmentation_maps=grouped_segmentation_maps[shape] if segmentation_maps is not None else None,
                padded_size=padded_size,
                ignore_index=ignore_index,
            )
            processed_images_grouped[shape] = padded_images
            processed_pixel_masks_grouped[shape] = pixel_masks
            if segmentation_maps is not None:
                processed_segmentation_maps_grouped[shape] = padded_segmentation_maps.squeeze(1)
        processed_images = reorder_images(processed_images_grouped, grouped_images_index)
        processed_pixel_masks = reorder_images(processed_pixel_masks_grouped, grouped_images_index)
        encoded_inputs = BatchFeature(
            data={
                "pixel_values": torch.stack(processed_images, dim=0) if return_tensors else processed_images,
                "pixel_mask": torch.stack(processed_pixel_masks, dim=0) if return_tensors else processed_pixel_masks,
            },
            tensor_type=return_tensors,
        )
        if segmentation_maps is not None:
            mask_labels = reorder_images(processed_segmentation_maps_grouped, grouped_segmentation_maps_index)
            # we cannot batch them since they don't share a common class size
            encoded_inputs["mask_labels"] = mask_labels
            encoded_inputs["class_labels"] = class_labels

        return encoded_inputs

    def post_process_semantic_segmentation(
        self, outputs, target_sizes: Optional[list[tuple[int, int]]] = None
    ) -> "torch.Tensor":
        """
        Converts the output of [`Mask2FormerForUniversalSegmentation`] into semantic segmentation maps. Only supports
        PyTorch.

        Args:
            outputs ([`Mask2FormerForUniversalSegmentation`]):
                Raw outputs of the model.
            target_sizes (`List[Tuple[int, int]]`, *optional*):
                List of length (batch_size), where each list item (`Tuple[int, int]]`) corresponds to the requested
                final size (height, width) of each prediction. If left to None, predictions will not be resized.
        Returns:
            `List[torch.Tensor]`:
                A list of length `batch_size`, where each item is a semantic segmentation map of shape (height, width)
                corresponding to the target_sizes entry (if `target_sizes` is specified). Each entry of each
                `torch.Tensor` correspond to a semantic class id.
        """
        class_queries_logits = outputs.class_queries_logits  # [batch_size, num_queries, num_classes+1]
        masks_queries_logits = outputs.masks_queries_logits  # [batch_size, num_queries, height, width]

        # Scale back to preprocessed image size - (384, 384) for all models
        masks_queries_logits = torch.nn.functional.interpolate(
            masks_queries_logits, size=(384, 384), mode="bilinear", align_corners=False
        )

        # Remove the null class `[..., :-1]`
        masks_classes = class_queries_logits.softmax(dim=-1)[..., :-1]
        masks_probs = masks_queries_logits.sigmoid()  # [batch_size, num_queries, height, width]

        # Semantic segmentation logits of shape (batch_size, num_classes, height, width)
        segmentation = torch.einsum("bqc, bqhw -> bchw", masks_classes, masks_probs)
        batch_size = class_queries_logits.shape[0]

        # Resize logits and compute semantic segmentation maps
        if target_sizes is not None:
            if batch_size != len(target_sizes):
                raise ValueError(
                    "Make sure that you pass in as many target sizes as the batch dimension of the logits"
                )

            semantic_segmentation = []
            for idx in range(batch_size):
                resized_logits = torch.nn.functional.interpolate(
                    segmentation[idx].unsqueeze(dim=0), size=target_sizes[idx], mode="bilinear", align_corners=False
                )
                semantic_map = resized_logits[0].argmax(dim=0)
                semantic_segmentation.append(semantic_map)
        else:
            semantic_segmentation = segmentation.argmax(dim=1)
            semantic_segmentation = [semantic_segmentation[i] for i in range(semantic_segmentation.shape[0])]

        return semantic_segmentation

    def post_process_instance_segmentation(
        self,
        outputs,
        threshold: float = 0.5,
        mask_threshold: float = 0.5,
        overlap_mask_area_threshold: float = 0.8,
        target_sizes: Optional[list[tuple[int, int]]] = None,
        return_coco_annotation: Optional[bool] = False,
        return_binary_maps: Optional[bool] = False,
    ) -> list[dict]:
        """
        Converts the output of [`Mask2FormerForUniversalSegmentationOutput`] into instance segmentation predictions.
        Only supports PyTorch. If instances could overlap, set either return_coco_annotation or return_binary_maps
        to `True` to get the correct segmentation result.

        Args:
            outputs ([`Mask2FormerForUniversalSegmentation`]):
                Raw outputs of the model.
            threshold (`float`, *optional*, defaults to 0.5):
                The probability score threshold to keep predicted instance masks.
            mask_threshold (`float`, *optional*, defaults to 0.5):
                Threshold to use when turning the predicted masks into binary values.
            overlap_mask_area_threshold (`float`, *optional*, defaults to 0.8):
                The overlap mask area threshold to merge or discard small disconnected parts within each binary
                instance mask.
            target_sizes (`List[Tuple]`, *optional*):
                List of length (batch_size), where each list item (`Tuple[int, int]]`) corresponds to the requested
                final size (height, width) of each prediction. If left to None, predictions will not be resized.
            return_coco_annotation (`bool`, *optional*, defaults to `False`):
                If set to `True`, segmentation maps are returned in COCO run-length encoding (RLE) format.
            return_binary_maps (`bool`, *optional*, defaults to `False`):
                If set to `True`, segmentation maps are returned as a concatenated tensor of binary segmentation maps
                (one per detected instance).
        Returns:
            `List[Dict]`: A list of dictionaries, one per image, each dictionary containing two keys:
            - **segmentation** -- A tensor of shape `(height, width)` where each pixel represents a `segment_id`, or
              `List[List]` run-length encoding (RLE) of the segmentation map if return_coco_annotation is set to
              `True`, or a tensor of shape `(num_instances, height, width)` if return_binary_maps is set to `True`.
              Set to `None` if no mask if found above `threshold`.
            - **segments_info** -- A dictionary that contains additional information on each segment.
                - **id** -- An integer representing the `segment_id`.
                - **label_id** -- An integer representing the label / semantic class id corresponding to `segment_id`.
                - **score** -- Prediction score of segment with `segment_id`.
        """
        if return_coco_annotation and return_binary_maps:
            raise ValueError("return_coco_annotation and return_binary_maps can not be both set to True.")

        # [batch_size, num_queries, num_classes+1]
        class_queries_logits = outputs.class_queries_logits
        # [batch_size, num_queries, height, width]
        masks_queries_logits = outputs.masks_queries_logits

        # Scale back to preprocessed image size - (384, 384) for all models
        masks_queries_logits = torch.nn.functional.interpolate(
            masks_queries_logits, size=(384, 384), mode="bilinear", align_corners=False
        )

        device = masks_queries_logits.device
        num_classes = class_queries_logits.shape[-1] - 1
        num_queries = class_queries_logits.shape[-2]

        # Loop over items in batch size
        results: list[dict[str, TensorType]] = []

        for i in range(class_queries_logits.shape[0]):
            mask_pred = masks_queries_logits[i]
            mask_cls = class_queries_logits[i]

            scores = torch.nn.functional.softmax(mask_cls, dim=-1)[:, :-1]
            labels = torch.arange(num_classes, device=device).unsqueeze(0).repeat(num_queries, 1).flatten(0, 1)

            scores_per_image, topk_indices = scores.flatten(0, 1).topk(num_queries, sorted=False)
            labels_per_image = labels[topk_indices]

            topk_indices = torch.div(topk_indices, num_classes, rounding_mode="floor")
            mask_pred = mask_pred[topk_indices]
            pred_masks = (mask_pred > 0).float()

            # Calculate average mask prob
            mask_scores_per_image = (mask_pred.sigmoid().flatten(1) * pred_masks.flatten(1)).sum(1) / (
                pred_masks.flatten(1).sum(1) + 1e-6
            )
            pred_scores = scores_per_image * mask_scores_per_image
            pred_classes = labels_per_image

            segmentation = torch.zeros((384, 384)) - 1
            if target_sizes is not None:
                segmentation = torch.zeros(target_sizes[i]) - 1
                pred_masks = torch.nn.functional.interpolate(
                    pred_masks.unsqueeze(0), size=target_sizes[i], mode="nearest"
                )[0]

            instance_maps, segments = [], []
            current_segment_id = 0
            for j in range(num_queries):
                score = pred_scores[j].item()

                if not torch.all(pred_masks[j] == 0) and score >= threshold:
                    segmentation[pred_masks[j] == 1] = current_segment_id
                    segments.append(
                        {
                            "id": current_segment_id,
                            "label_id": pred_classes[j].item(),
                            "was_fused": False,
                            "score": round(score, 6),
                        }
                    )
                    current_segment_id += 1
                    instance_maps.append(pred_masks[j])

            # Return segmentation map in run-length encoding (RLE) format
            if return_coco_annotation:
                segmentation = convert_segmentation_to_rle(segmentation)

            # Return a concatenated tensor of binary instance maps
            if return_binary_maps and len(instance_maps) != 0:
                segmentation = torch.stack(instance_maps, dim=0)

            results.append({"segmentation": segmentation, "segments_info": segments})
        return results

    def post_process_panoptic_segmentation(
        self,
        outputs,
        threshold: float = 0.5,
        mask_threshold: float = 0.5,
        overlap_mask_area_threshold: float = 0.8,
        label_ids_to_fuse: Optional[set[int]] = None,
        target_sizes: Optional[list[tuple[int, int]]] = None,
    ) -> list[dict]:
        """
        Converts the output of [`Mask2FormerForUniversalSegmentationOutput`] into image panoptic segmentation
        predictions. Only supports PyTorch.

        Args:
            outputs ([`Mask2FormerForUniversalSegmentationOutput`]):
                The outputs from [`Mask2FormerForUniversalSegmentation`].
            threshold (`float`, *optional*, defaults to 0.5):
                The probability score threshold to keep predicted instance masks.
            mask_threshold (`float`, *optional*, defaults to 0.5):
                Threshold to use when turning the predicted masks into binary values.
            overlap_mask_area_threshold (`float`, *optional*, defaults to 0.8):
                The overlap mask area threshold to merge or discard small disconnected parts within each binary
                instance mask.
            label_ids_to_fuse (`Set[int]`, *optional*):
                The labels in this state will have all their instances be fused together. For instance we could say
                there can only be one sky in an image, but several persons, so the label ID for sky would be in that
                set, but not the one for person.
            target_sizes (`List[Tuple]`, *optional*):
                List of length (batch_size), where each list item (`Tuple[int, int]]`) corresponds to the requested
                final size (height, width) of each prediction in batch. If left to None, predictions will not be
                resized.

        Returns:
            `List[Dict]`: A list of dictionaries, one per image, each dictionary containing two keys:
            - **segmentation** -- a tensor of shape `(height, width)` where each pixel represents a `segment_id`, set
              to `None` if no mask if found above `threshold`. If `target_sizes` is specified, segmentation is resized
              to the corresponding `target_sizes` entry.
            - **segments_info** -- A dictionary that contains additional information on each segment.
                - **id** -- an integer representing the `segment_id`.
                - **label_id** -- An integer representing the label / semantic class id corresponding to `segment_id`.
                - **was_fused** -- a boolean, `True` if `label_id` was in `label_ids_to_fuse`, `False` otherwise.
                  Multiple instances of the same class / label were fused and assigned a single `segment_id`.
                - **score** -- Prediction score of segment with `segment_id`.
        """

        if label_ids_to_fuse is None:
            logger.warning("`label_ids_to_fuse` unset. No instance will be fused.")
            label_ids_to_fuse = set()

        class_queries_logits = outputs.class_queries_logits  # [batch_size, num_queries, num_classes+1]
        masks_queries_logits = outputs.masks_queries_logits  # [batch_size, num_queries, height, width]

        # Scale back to preprocessed image size - (384, 384) for all models
        masks_queries_logits = torch.nn.functional.interpolate(
            masks_queries_logits, size=(384, 384), mode="bilinear", align_corners=False
        )

        batch_size = class_queries_logits.shape[0]
        num_labels = class_queries_logits.shape[-1] - 1

        mask_probs = masks_queries_logits.sigmoid()  # [batch_size, num_queries, height, width]

        # Predicted label and score of each query (batch_size, num_queries)
        pred_scores, pred_labels = nn.functional.softmax(class_queries_logits, dim=-1).max(-1)

        # Loop over items in batch size
        results: list[dict[str, TensorType]] = []

        for i in range(batch_size):
            mask_probs_item, pred_scores_item, pred_labels_item = remove_low_and_no_objects(
                mask_probs[i], pred_scores[i], pred_labels[i], threshold, num_labels
            )

            # No mask found
            if mask_probs_item.shape[0] <= 0:
                height, width = target_sizes[i] if target_sizes is not None else mask_probs_item.shape[1:]
                segmentation = torch.zeros((height, width)) - 1
                results.append({"segmentation": segmentation, "segments_info": []})
                continue

            # Get segmentation map and segment information of batch item
            target_size = target_sizes[i] if target_sizes is not None else None
            segmentation, segments = compute_segments(
                mask_probs=mask_probs_item,
                pred_scores=pred_scores_item,
                pred_labels=pred_labels_item,
                mask_threshold=mask_threshold,
                overlap_mask_area_threshold=overlap_mask_area_threshold,
                label_ids_to_fuse=label_ids_to_fuse,
                target_size=target_size,
            )

            results.append({"segmentation": segmentation, "segments_info": segments})
        return results


__all__ = ["Mask2FormerImageProcessorFast"]
