# coding=utf-8
# Copyright 2024 The HuggingFace Inc. 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.
"""Testing suite for the PyTorch DAB-DETR model."""

import inspect
import math
import unittest
from typing import Dict, List, Tuple

from transformers import DabDetrConfig, ResNetConfig, is_torch_available, is_vision_available
from transformers.testing_utils import require_timm, require_torch, require_vision, slow, torch_device
from transformers.utils import cached_property

from ...test_configuration_common import ConfigTester
from ...test_modeling_common import ModelTesterMixin, _config_zero_init, floats_tensor
from ...test_pipeline_mixin import PipelineTesterMixin


if is_torch_available():
    import torch
    import torch.nn.functional as F

    from transformers import (
        DabDetrForObjectDetection,
        DabDetrModel,
    )


if is_vision_available():
    from PIL import Image

    from transformers import ConditionalDetrImageProcessor


class DabDetrModelTester:
    def __init__(
        self,
        parent,
        batch_size=8,
        is_training=True,
        use_labels=True,
        hidden_size=32,
        num_hidden_layers=2,
        num_attention_heads=8,
        intermediate_size=4,
        hidden_act="gelu",
        hidden_dropout_prob=0.1,
        attention_probs_dropout_prob=0.1,
        num_queries=12,
        num_channels=3,
        min_size=200,
        max_size=200,
        n_targets=8,
        num_labels=91,
    ):
        self.parent = parent
        self.batch_size = batch_size
        self.is_training = is_training
        self.use_labels = use_labels
        self.hidden_size = hidden_size
        self.num_hidden_layers = num_hidden_layers
        self.num_attention_heads = num_attention_heads
        self.intermediate_size = intermediate_size
        self.hidden_act = hidden_act
        self.hidden_dropout_prob = hidden_dropout_prob
        self.attention_probs_dropout_prob = attention_probs_dropout_prob
        self.num_queries = num_queries
        self.num_channels = num_channels
        self.min_size = min_size
        self.max_size = max_size
        self.n_targets = n_targets
        self.num_labels = num_labels

        # we also set the expected seq length for both encoder and decoder
        self.encoder_seq_length = math.ceil(self.min_size / 32) * math.ceil(self.max_size / 32)
        self.decoder_seq_length = self.num_queries

    def prepare_config_and_inputs(self):
        pixel_values = floats_tensor([self.batch_size, self.num_channels, self.min_size, self.max_size])

        pixel_mask = torch.ones([self.batch_size, self.min_size, self.max_size], device=torch_device)

        labels = None
        if self.use_labels:
            # labels is a list of Dict (each Dict being the labels for a given example in the batch)
            labels = []
            for i in range(self.batch_size):
                target = {}
                target["class_labels"] = torch.randint(
                    high=self.num_labels, size=(self.n_targets,), device=torch_device
                )
                target["boxes"] = torch.rand(self.n_targets, 4, device=torch_device)
                target["masks"] = torch.rand(self.n_targets, self.min_size, self.max_size, device=torch_device)
                labels.append(target)

        config = self.get_config()
        return config, pixel_values, pixel_mask, labels

    def get_config(self):
        resnet_config = ResNetConfig(
            num_channels=3,
            embeddings_size=10,
            hidden_sizes=[10, 20, 30, 40],
            depths=[1, 1, 2, 1],
            hidden_act="relu",
            num_labels=3,
            out_features=["stage2", "stage3", "stage4"],
            out_indices=[2, 3, 4],
        )
        return DabDetrConfig(
            hidden_size=self.hidden_size,
            encoder_layers=self.num_hidden_layers,
            decoder_layers=self.num_hidden_layers,
            encoder_attention_heads=self.num_attention_heads,
            decoder_attention_heads=self.num_attention_heads,
            encoder_ffn_dim=self.intermediate_size,
            decoder_ffn_dim=self.intermediate_size,
            dropout=self.hidden_dropout_prob,
            attention_dropout=self.attention_probs_dropout_prob,
            num_queries=self.num_queries,
            num_labels=self.num_labels,
            use_timm_backbone=False,
            backbone_config=resnet_config,
            backbone=None,
            use_pretrained_backbone=False,
        )

    def prepare_config_and_inputs_for_common(self):
        config, pixel_values, pixel_mask, labels = self.prepare_config_and_inputs()
        inputs_dict = {"pixel_values": pixel_values, "pixel_mask": pixel_mask}
        return config, inputs_dict

    def create_and_check_dab_detr_model(self, config, pixel_values, pixel_mask, labels):
        model = DabDetrModel(config=config)
        model.to(torch_device)
        model.eval()

        result = model(pixel_values=pixel_values, pixel_mask=pixel_mask)
        result = model(pixel_values)

        self.parent.assertEqual(
            result.last_hidden_state.shape, (self.batch_size, self.decoder_seq_length, self.hidden_size)
        )

    def create_and_check_dab_detr_object_detection_head_model(self, config, pixel_values, pixel_mask, labels):
        model = DabDetrForObjectDetection(config=config)
        model.to(torch_device)
        model.eval()

        result = model(pixel_values=pixel_values, pixel_mask=pixel_mask)
        result = model(pixel_values)

        self.parent.assertEqual(result.logits.shape, (self.batch_size, self.num_queries, self.num_labels))
        self.parent.assertEqual(result.pred_boxes.shape, (self.batch_size, self.num_queries, 4))

        result = model(pixel_values=pixel_values, labels=labels)

        self.parent.assertEqual(result.loss.shape, ())
        self.parent.assertEqual(result.logits.shape, (self.batch_size, self.num_queries, self.num_labels))
        self.parent.assertEqual(result.pred_boxes.shape, (self.batch_size, self.num_queries, 4))


@require_torch
class DabDetrModelTest(ModelTesterMixin, PipelineTesterMixin, unittest.TestCase):
    all_model_classes = (DabDetrModel, DabDetrForObjectDetection) if is_torch_available() else ()
    pipeline_model_mapping = (
        {
            "image-feature-extraction": DabDetrModel,
            "object-detection": DabDetrForObjectDetection,
        }
        if is_torch_available()
        else {}
    )
    is_encoder_decoder = True
    test_torchscript = False
    test_pruning = False
    test_head_masking = False
    test_missing_keys = False
    zero_init_hidden_state = True
    test_torch_exportable = True

    # special case for head models
    def _prepare_for_class(self, inputs_dict, model_class, return_labels=False):
        inputs_dict = super()._prepare_for_class(inputs_dict, model_class, return_labels=return_labels)

        if return_labels:
            if model_class.__name__ in ["DabDetrForObjectDetection"]:
                labels = []
                for i in range(self.model_tester.batch_size):
                    target = {}
                    target["class_labels"] = torch.ones(
                        size=(self.model_tester.n_targets,), device=torch_device, dtype=torch.long
                    )
                    target["boxes"] = torch.ones(
                        self.model_tester.n_targets, 4, device=torch_device, dtype=torch.float
                    )
                    target["masks"] = torch.ones(
                        self.model_tester.n_targets,
                        self.model_tester.min_size,
                        self.model_tester.max_size,
                        device=torch_device,
                        dtype=torch.float,
                    )
                    labels.append(target)
                inputs_dict["labels"] = labels

        return inputs_dict

    def setUp(self):
        self.model_tester = DabDetrModelTester(self)
        self.config_tester = ConfigTester(self, config_class=DabDetrConfig, has_text_modality=False)

    def test_config(self):
        self.config_tester.run_common_tests()

    def test_dab_detr_model(self):
        config_and_inputs = self.model_tester.prepare_config_and_inputs()
        self.model_tester.create_and_check_dab_detr_model(*config_and_inputs)

    def test_dab_detr_object_detection_head_model(self):
        config_and_inputs = self.model_tester.prepare_config_and_inputs()
        self.model_tester.create_and_check_dab_detr_object_detection_head_model(*config_and_inputs)

    # TODO: check if this works again for PyTorch 2.x.y
    @unittest.skip(reason="Got `CUDA error: misaligned address` with PyTorch 2.0.0.")
    def test_multi_gpu_data_parallel_forward(self):
        pass

    @unittest.skip(reason="DETR does not use inputs_embeds")
    def test_inputs_embeds(self):
        pass

    @unittest.skip(reason="DETR does not use inputs_embeds")
    def test_model_get_set_embeddings(self):
        pass

    @unittest.skip(reason="DETR does not use inputs_embeds")
    def test_inputs_embeds_matches_input_ids(self):
        pass

    @unittest.skip(reason="DETR does not have a get_input_embeddings method")
    def test_model_common_attributes(self):
        pass

    @unittest.skip(reason="DETR is not a generative model")
    def test_generate_without_input_ids(self):
        pass

    @unittest.skip(reason="DETR does not use token embeddings")
    def test_resize_tokens_embeddings(self):
        pass

    @slow
    def test_model_outputs_equivalence(self):
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        def set_nan_tensor_to_zero(t):
            print(t)
            t[t != t] = 0
            return t

        def check_equivalence(model, tuple_inputs, dict_inputs, additional_kwargs={}):
            with torch.no_grad():
                tuple_output = model(**tuple_inputs, return_dict=False, **additional_kwargs)
                dict_output = model(**dict_inputs, return_dict=True, **additional_kwargs).to_tuple()

                def recursive_check(tuple_object, dict_object):
                    if isinstance(tuple_object, (List, Tuple)):
                        for tuple_iterable_value, dict_iterable_value in zip(tuple_object, dict_object):
                            recursive_check(tuple_iterable_value, dict_iterable_value)
                    elif isinstance(tuple_object, Dict):
                        for tuple_iterable_value, dict_iterable_value in zip(
                            tuple_object.values(), dict_object.values()
                        ):
                            recursive_check(tuple_iterable_value, dict_iterable_value)
                    elif tuple_object is None:
                        return
                    else:
                        torch.testing.assert_close(
                            set_nan_tensor_to_zero(tuple_object),
                            set_nan_tensor_to_zero(dict_object),
                            atol=1e-5,
                            rtol=1e-5,
                            msg=(
                                "Tuple and dict output are not equal. Difference:"
                                f" {torch.max(torch.abs(tuple_object - dict_object))}. Tuple has `nan`:"
                                f" {torch.isnan(tuple_object).any()} and `inf`: {torch.isinf(tuple_object)}. Dict has"
                                f" `nan`: {torch.isnan(dict_object).any()} and `inf`: {torch.isinf(dict_object)}."
                            ),
                        )

                recursive_check(tuple_output, dict_output)

        for model_class in self.all_model_classes:
            model = model_class(config)
            model.to(torch_device)
            model.eval()

            tuple_inputs = self._prepare_for_class(inputs_dict, model_class)
            dict_inputs = self._prepare_for_class(inputs_dict, model_class)
            check_equivalence(model, tuple_inputs, dict_inputs)

            tuple_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
            dict_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
            check_equivalence(model, tuple_inputs, dict_inputs)

            tuple_inputs = self._prepare_for_class(inputs_dict, model_class)
            dict_inputs = self._prepare_for_class(inputs_dict, model_class)
            check_equivalence(model, tuple_inputs, dict_inputs, {"output_hidden_states": True})

            tuple_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
            dict_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
            check_equivalence(model, tuple_inputs, dict_inputs, {"output_hidden_states": True})

            if self.has_attentions:
                tuple_inputs = self._prepare_for_class(inputs_dict, model_class)
                dict_inputs = self._prepare_for_class(inputs_dict, model_class)
                check_equivalence(model, tuple_inputs, dict_inputs, {"output_attentions": True})

                tuple_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
                dict_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
                check_equivalence(model, tuple_inputs, dict_inputs, {"output_attentions": True})

                tuple_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
                dict_inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
                check_equivalence(
                    model, tuple_inputs, dict_inputs, {"output_hidden_states": True, "output_attentions": True}
                )

    def test_hidden_states_output(self):
        def check_hidden_states_output(inputs_dict, config, model_class):
            model = model_class(config)
            model.to(torch_device)
            model.eval()

            with torch.no_grad():
                outputs = model(**self._prepare_for_class(inputs_dict, model_class))

            hidden_states = outputs.encoder_hidden_states if config.is_encoder_decoder else outputs.hidden_states

            expected_num_layers = getattr(
                self.model_tester, "expected_num_hidden_layers", self.model_tester.num_hidden_layers + 1
            )

            self.assertEqual(len(hidden_states), expected_num_layers)

            if hasattr(self.model_tester, "encoder_seq_length"):
                seq_length = self.model_tester.encoder_seq_length
                if hasattr(self.model_tester, "chunk_length") and self.model_tester.chunk_length > 1:
                    seq_length = seq_length * self.model_tester.chunk_length
            else:
                seq_length = self.model_tester.seq_length

            self.assertListEqual(
                [hidden_states[0].shape[1], hidden_states[0].shape[2]],
                [seq_length, self.model_tester.hidden_size],
            )

            if config.is_encoder_decoder:
                hidden_states = outputs.decoder_hidden_states

                self.assertIsInstance(hidden_states, (list, tuple))

                self.assertEqual(len(hidden_states), expected_num_layers)
                seq_len = getattr(self.model_tester, "seq_length", None)
                decoder_seq_length = getattr(self.model_tester, "decoder_seq_length", seq_len)

                self.assertListEqual(
                    [hidden_states[0].shape[1], hidden_states[0].shape[2]],
                    [decoder_seq_length, self.model_tester.hidden_size],
                )

        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        for model_class in self.all_model_classes:
            inputs_dict["output_hidden_states"] = True
            check_hidden_states_output(inputs_dict, config, model_class)

            # check that output_hidden_states also work using config
            del inputs_dict["output_hidden_states"]
            config.output_hidden_states = True

            check_hidden_states_output(inputs_dict, config, model_class)

    # Had to modify the threshold to 2 decimals instead of 3 because sometimes it threw an error
    def test_batching_equivalence(self):
        """
        Tests that the model supports batching and that the output is the nearly the same for the same input in
        different batch sizes.
        (Why "nearly the same" not "exactly the same"? Batching uses different matmul shapes, which often leads to
        different results: https://github.com/huggingface/transformers/issues/25420#issuecomment-1775317535)
        """

        def get_tensor_equivalence_function(batched_input):
            # models operating on continuous spaces have higher abs difference than LMs
            # instead, we can rely on cos distance for image/speech models, similar to `diffusers`
            if "input_ids" not in batched_input:
                return lambda tensor1, tensor2: (
                    1.0 - F.cosine_similarity(tensor1.float().flatten(), tensor2.float().flatten(), dim=0, eps=1e-38)
                )
            return lambda tensor1, tensor2: torch.max(torch.abs(tensor1 - tensor2))

        def recursive_check(batched_object, single_row_object, model_name, key):
            if isinstance(batched_object, (list, tuple)):
                for batched_object_value, single_row_object_value in zip(batched_object, single_row_object):
                    recursive_check(batched_object_value, single_row_object_value, model_name, key)
            elif isinstance(batched_object, dict):
                for batched_object_value, single_row_object_value in zip(
                    batched_object.values(), single_row_object.values()
                ):
                    recursive_check(batched_object_value, single_row_object_value, model_name, key)
            # do not compare returned loss (0-dim tensor) / codebook ids (int) / caching objects
            elif batched_object is None or not isinstance(batched_object, torch.Tensor):
                return
            elif batched_object.dim() == 0:
                return
            else:
                # indexing the first element does not always work
                # e.g. models that output similarity scores of size (N, M) would need to index [0, 0]
                slice_ids = [slice(0, index) for index in single_row_object.shape]
                batched_row = batched_object[slice_ids]
                self.assertFalse(
                    torch.isnan(batched_row).any(), f"Batched output has `nan` in {model_name} for key={key}"
                )
                self.assertFalse(
                    torch.isinf(batched_row).any(), f"Batched output has `inf` in {model_name} for key={key}"
                )
                self.assertFalse(
                    torch.isnan(single_row_object).any(), f"Single row output has `nan` in {model_name} for key={key}"
                )
                self.assertFalse(
                    torch.isinf(single_row_object).any(), f"Single row output has `inf` in {model_name} for key={key}"
                )
                self.assertTrue(
                    (equivalence(batched_row, single_row_object)) <= 1e-02,
                    msg=(
                        f"Batched and Single row outputs are not equal in {model_name} for key={key}. "
                        f"Difference={equivalence(batched_row, single_row_object)}."
                    ),
                )

        config, batched_input = self.model_tester.prepare_config_and_inputs_for_common()
        equivalence = get_tensor_equivalence_function(batched_input)

        for model_class in self.all_model_classes:
            config.output_hidden_states = True

            model_name = model_class.__name__
            if hasattr(self.model_tester, "prepare_config_and_inputs_for_model_class"):
                config, batched_input = self.model_tester.prepare_config_and_inputs_for_model_class(model_class)
            batched_input_prepared = self._prepare_for_class(batched_input, model_class)
            model = model_class(config).to(torch_device).eval()

            batch_size = self.model_tester.batch_size
            single_row_input = {}
            for key, value in batched_input_prepared.items():
                if isinstance(value, torch.Tensor) and value.shape[0] % batch_size == 0:
                    # e.g. musicgen has inputs of size (bs*codebooks). in most cases value.shape[0] == batch_size
                    single_batch_shape = value.shape[0] // batch_size
                    single_row_input[key] = value[:single_batch_shape]
                else:
                    single_row_input[key] = value

            with torch.no_grad():
                model_batched_output = model(**batched_input_prepared)
                model_row_output = model(**single_row_input)

            if isinstance(model_batched_output, torch.Tensor):
                model_batched_output = {"model_output": model_batched_output}
                model_row_output = {"model_output": model_row_output}

            for key in model_batched_output:
                # DETR starts from zero-init queries to decoder, leading to cos_similarity = `nan`
                if hasattr(self, "zero_init_hidden_state") and "decoder_hidden_states" in key:
                    model_batched_output[key] = model_batched_output[key][1:]
                    model_row_output[key] = model_row_output[key][1:]
                recursive_check(model_batched_output[key], model_row_output[key], model_name, key)

    def test_attention_outputs(self):
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
        config.return_dict = True

        decoder_seq_length = self.model_tester.decoder_seq_length
        encoder_seq_length = self.model_tester.encoder_seq_length
        decoder_key_length = self.model_tester.decoder_seq_length
        encoder_key_length = self.model_tester.encoder_seq_length

        for model_class in self.all_model_classes:
            inputs_dict["output_attentions"] = True
            inputs_dict["output_hidden_states"] = False
            config.return_dict = True
            model = model_class(config)
            model.to(torch_device)
            model.eval()
            with torch.no_grad():
                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
            attentions = outputs.encoder_attentions if config.is_encoder_decoder else outputs.attentions
            self.assertEqual(len(attentions), self.model_tester.num_hidden_layers)

            # check that output_attentions also work using config
            del inputs_dict["output_attentions"]
            del inputs_dict["output_hidden_states"]
            config.output_attentions = True
            config.output_hidden_states = False
            model = model_class(config)
            model.to(torch_device)
            model.eval()
            with torch.no_grad():
                outputs = model(**self._prepare_for_class(inputs_dict, model_class))

            attentions = outputs.encoder_attentions if config.is_encoder_decoder else outputs.attentions
            self.assertEqual(len(attentions), self.model_tester.num_hidden_layers)

            self.assertListEqual(
                list(attentions[0].shape[-3:]),
                [self.model_tester.num_attention_heads, encoder_seq_length, encoder_key_length],
            )
            out_len = len(outputs)
            if self.is_encoder_decoder:
                correct_outlen = 6

                # loss is at first position
                if "labels" in inputs_dict:
                    correct_outlen += 1  # loss is added to beginning
                if "past_key_values" in outputs:
                    correct_outlen += 1  # past_key_values have been returned

                self.assertEqual(out_len, correct_outlen)

                # decoder attentions
                decoder_attentions = outputs.decoder_attentions
                self.assertIsInstance(decoder_attentions, (list, tuple))
                self.assertEqual(len(decoder_attentions), self.model_tester.num_hidden_layers)
                self.assertListEqual(
                    list(decoder_attentions[0].shape[-3:]),
                    [self.model_tester.num_attention_heads, decoder_seq_length, decoder_key_length],
                )

                # cross attentions
                cross_attentions = outputs.cross_attentions
                self.assertIsInstance(cross_attentions, (list, tuple))
                self.assertEqual(len(cross_attentions), self.model_tester.num_hidden_layers)
                self.assertListEqual(
                    list(cross_attentions[0].shape[-3:]),
                    [
                        self.model_tester.num_attention_heads,
                        decoder_seq_length,
                        encoder_key_length,
                    ],
                )

            # Check attention is always last and order is fine
            inputs_dict["output_attentions"] = True
            inputs_dict["output_hidden_states"] = True
            model = model_class(config)
            model.to(torch_device)
            model.eval()
            with torch.no_grad():
                outputs = model(**self._prepare_for_class(inputs_dict, model_class))

            if hasattr(self.model_tester, "num_hidden_states_types"):
                added_hidden_states = self.model_tester.num_hidden_states_types
            elif self.is_encoder_decoder:
                # decoder_hidden_states, encoder_last_hidden_state, encoder_hidden_states
                added_hidden_states = 3
            else:
                added_hidden_states = 1

            self.assertEqual(out_len + added_hidden_states, len(outputs))

            self_attentions = outputs.encoder_attentions if config.is_encoder_decoder else outputs.attentions

            self.assertEqual(len(self_attentions), self.model_tester.num_hidden_layers)
            self.assertListEqual(
                list(self_attentions[0].shape[-3:]),
                [self.model_tester.num_attention_heads, encoder_seq_length, encoder_key_length],
            )

    def test_retain_grad_hidden_states_attentions(self):
        # removed retain_grad and grad on decoder_hidden_states, as queries don't require grad
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        # no need to test all models as different heads yield the same functionality
        model_class = self.all_model_classes[0]
        model = model_class(config)
        model.to(torch_device)

        inputs = self._prepare_for_class(inputs_dict, model_class)

        outputs = model(**inputs, output_attentions=True, output_hidden_states=True)

        # logits
        output = outputs[0]

        encoder_hidden_states = outputs.encoder_hidden_states[0]
        encoder_hidden_states.retain_grad()

        encoder_attentions = outputs.encoder_attentions[0]
        encoder_attentions.retain_grad()

        decoder_attentions = outputs.decoder_attentions[0]
        decoder_attentions.retain_grad()

        cross_attentions = outputs.cross_attentions[0]
        cross_attentions.retain_grad()

        output.flatten()[0].backward(retain_graph=True)

        self.assertIsNotNone(encoder_hidden_states.grad)
        self.assertIsNotNone(encoder_attentions.grad)
        self.assertIsNotNone(decoder_attentions.grad)
        self.assertIsNotNone(cross_attentions.grad)

    def test_forward_auxiliary_loss(self):
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
        config.auxiliary_loss = True

        # only test for object detection and segmentation model
        for model_class in self.all_model_classes[1:]:
            model = model_class(config)
            model.to(torch_device)

            inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)

            outputs = model(**inputs)

            self.assertIsNotNone(outputs.auxiliary_outputs)
            self.assertEqual(len(outputs.auxiliary_outputs), self.model_tester.num_hidden_layers - 1)

    def test_training(self):
        if not self.model_tester.is_training:
            self.skipTest(reason="ModelTester is not configured to run training tests")

        # We only have loss with ObjectDetection
        model_class = self.all_model_classes[-1]
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
        config.return_dict = True

        model = model_class(config)
        model.to(torch_device)
        model.train()
        inputs = self._prepare_for_class(inputs_dict, model_class, return_labels=True)
        loss = model(**inputs).loss
        loss.backward()

    def test_forward_signature(self):
        config, _ = self.model_tester.prepare_config_and_inputs_for_common()

        for model_class in self.all_model_classes:
            model = model_class(config)
            signature = inspect.signature(model.forward)
            # signature.parameters is an OrderedDict => so arg_names order is deterministic
            arg_names = [*signature.parameters.keys()]

            if model.config.is_encoder_decoder:
                expected_arg_names = ["pixel_values", "pixel_mask"]
                expected_arg_names.extend(
                    ["head_mask", "decoder_head_mask", "encoder_outputs"]
                    if "head_mask" and "decoder_head_mask" in arg_names
                    else []
                )
                self.assertListEqual(arg_names[: len(expected_arg_names)], expected_arg_names)
            else:
                expected_arg_names = ["pixel_values", "pixel_mask"]
                self.assertListEqual(arg_names[:1], expected_arg_names)

    def test_different_timm_backbone(self):
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        # let's pick a random timm backbone
        config.backbone = "tf_mobilenetv3_small_075"
        config.backbone_config = None
        config.use_timm_backbone = True
        config.backbone_kwargs = {"out_indices": [2, 3, 4]}

        for model_class in self.all_model_classes:
            model = model_class(config)
            model.to(torch_device)
            model.eval()
            with torch.no_grad():
                outputs = model(**self._prepare_for_class(inputs_dict, model_class))

            if model_class.__name__ == "DabDetrForObjectDetection":
                expected_shape = (
                    self.model_tester.batch_size,
                    self.model_tester.num_queries,
                    self.model_tester.num_labels,
                )
                self.assertEqual(outputs.logits.shape, expected_shape)
                # Confirm out_indices was propogated to backbone
                self.assertEqual(len(model.model.backbone.conv_encoder.intermediate_channel_sizes), 3)
            else:
                # Confirm out_indices was propogated to backbone
                self.assertEqual(len(model.backbone.conv_encoder.intermediate_channel_sizes), 3)

            self.assertTrue(outputs)

    def test_initialization(self):
        config, _ = self.model_tester.prepare_config_and_inputs_for_common()

        configs_no_init = _config_zero_init(config)
        configs_no_init.init_xavier_std = 1e9
        # Copied from RT-DETR
        configs_no_init.initializer_bias_prior_prob = 0.2
        bias_value = -1.3863  # log_e ((1 - 0.2) / 0.2)

        for model_class in self.all_model_classes:
            model = model_class(config=configs_no_init)
            for name, param in model.named_parameters():
                if param.requires_grad:
                    if "bbox_attention" in name and "bias" not in name:
                        self.assertLess(
                            100000,
                            abs(param.data.max().item()),
                            msg=f"Parameter {name} of model {model_class} seems not properly initialized",
                        )
                    # Modifed from RT-DETR
                    elif "class_embed" in name and "bias" in name:
                        bias_tensor = torch.full_like(param.data, bias_value)
                        torch.testing.assert_close(
                            param.data,
                            bias_tensor,
                            atol=1e-4,
                            rtol=1e-4,
                            msg=f"Parameter {name} of model {model_class} seems not properly initialized",
                        )
                    elif "activation_fn" in name and config.activation_function == "prelu":
                        self.assertTrue(
                            param.data.mean() == 0.25,
                            msg=f"Parameter {name} of model {model_class} seems not properly initialized",
                        )
                    elif "backbone.conv_encoder.model" in name:
                        continue
                    elif "self_attn.in_proj_weight" in name:
                        self.assertIn(
                            ((param.data.mean() * 1e2).round() / 1e2).item(),
                            [0.0, 1.0],
                            msg=f"Parameter {name} of model {model_class} seems not properly initialized",
                        )
                    else:
                        self.assertIn(
                            ((param.data.mean() * 1e9).round() / 1e9).item(),
                            [0.0, 1.0],
                            msg=f"Parameter {name} of model {model_class} seems not properly initialized",
                        )


TOLERANCE = 1e-4
CHECKPOINT = "IDEA-Research/dab-detr-resnet-50"


# We will verify our results on an image of cute cats
def prepare_img():
    image = Image.open("./tests/fixtures/tests_samples/COCO/000000039769.png")
    return image


@require_timm
@require_vision
@slow
class DabDetrModelIntegrationTests(unittest.TestCase):
    @cached_property
    def default_image_processor(self):
        return ConditionalDetrImageProcessor.from_pretrained(CHECKPOINT) if is_vision_available() else None

    def test_inference_no_head(self):
        model = DabDetrModel.from_pretrained(CHECKPOINT).to(torch_device)

        image_processor = self.default_image_processor
        image = prepare_img()
        encoding = image_processor(images=image, return_tensors="pt").to(torch_device)

        with torch.no_grad():
            outputs = model(pixel_values=encoding.pixel_values)

        expected_shape = torch.Size((1, 300, 256))
        self.assertEqual(outputs.last_hidden_state.shape, expected_shape)
        expected_slice = torch.tensor(
            [[-0.4879, -0.2594, 0.4524], [-0.4997, -0.4258, 0.4329], [-0.8220, -0.4996, 0.0577]]
        ).to(torch_device)
        torch.testing.assert_close(outputs.last_hidden_state[0, :3, :3], expected_slice, atol=2e-4, rtol=2e-4)

    def test_inference_object_detection_head(self):
        model = DabDetrForObjectDetection.from_pretrained(CHECKPOINT).to(torch_device)

        image_processor = self.default_image_processor
        image = prepare_img()
        encoding = image_processor(images=image, return_tensors="pt").to(torch_device)
        pixel_values = encoding["pixel_values"].to(torch_device)

        with torch.no_grad():
            outputs = model(pixel_values)

        # verify logits + box predictions
        expected_shape_logits = torch.Size((1, model.config.num_queries, model.config.num_labels))
        self.assertEqual(outputs.logits.shape, expected_shape_logits)
        expected_slice_logits = torch.tensor(
            [[-10.1765, -5.5243, -8.9324], [-9.8138, -5.6721, -7.5161], [-10.3054, -5.6081, -8.5931]]
        ).to(torch_device)
        torch.testing.assert_close(outputs.logits[0, :3, :3], expected_slice_logits, atol=3e-4, rtol=3e-4)

        expected_shape_boxes = torch.Size((1, model.config.num_queries, 4))
        self.assertEqual(outputs.pred_boxes.shape, expected_shape_boxes)
        expected_slice_boxes = torch.tensor(
            [[0.3708, 0.3000, 0.2753], [0.5211, 0.6125, 0.9495], [0.2897, 0.6730, 0.5459]]
        ).to(torch_device)
        torch.testing.assert_close(outputs.pred_boxes[0, :3, :3], expected_slice_boxes, atol=1e-4, rtol=1e-4)

        # verify postprocessing
        results = image_processor.post_process_object_detection(
            outputs, threshold=0.3, target_sizes=[image.size[::-1]]
        )[0]
        expected_scores = torch.tensor([0.8732, 0.8563, 0.8554, 0.6079, 0.5896]).to(torch_device)
        expected_labels = [17, 75, 17, 75, 63]
        expected_boxes = torch.tensor([14.6970, 49.3892, 320.5165, 469.2765]).to(torch_device)

        self.assertEqual(len(results["scores"]), 5)
        torch.testing.assert_close(results["scores"], expected_scores, atol=1e-4, rtol=1e-4)
        self.assertSequenceEqual(results["labels"].tolist(), expected_labels)
        torch.testing.assert_close(results["boxes"][0, :], expected_boxes, atol=1e-4, rtol=1e-4)
