# Copyright 2020 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.

import logging
import os
import sys
import tempfile
import unittest
from pathlib import Path

import datasets
import numpy as np
from huggingface_hub import HfFolder, Repository, create_repo, delete_repo, set_access_token
from requests.exceptions import HTTPError

from transformers import (
    AutoModelForSequenceClassification,
    AutoTokenizer,
    DistilBertForSequenceClassification,
    TextClassificationPipeline,
    TFAutoModelForSequenceClassification,
    pipeline,
)
from transformers.pipelines import PIPELINE_REGISTRY, get_task
from transformers.pipelines.base import Pipeline, _pad
from transformers.testing_utils import (
    TOKEN,
    USER,
    CaptureLogger,
    RequestCounter,
    is_staging_test,
    nested_simplify,
    require_tensorflow_probability,
    require_tf,
    require_torch,
    require_torch_or_tf,
    slow,
)
from transformers.utils import direct_transformers_import, is_tf_available, is_torch_available
from transformers.utils import logging as transformers_logging


sys.path.append(str(Path(__file__).parent.parent.parent / "utils"))

from test_module.custom_pipeline import PairClassificationPipeline  # noqa E402


logger = logging.getLogger(__name__)


PATH_TO_TRANSFORMERS = os.path.join(Path(__file__).parent.parent.parent, "src/transformers")


# Dynamically import the Transformers module to grab the attribute classes of the processor form their names.
transformers_module = direct_transformers_import(PATH_TO_TRANSFORMERS)


class ANY:
    def __init__(self, *_types):
        self._types = _types

    def __eq__(self, other):
        return isinstance(other, self._types)

    def __repr__(self):
        return f"ANY({', '.join(_type.__name__ for _type in self._types)})"


class CommonPipelineTest(unittest.TestCase):
    @require_torch
    def test_pipeline_iteration(self):
        from torch.utils.data import Dataset

        class MyDataset(Dataset):
            data = [
                "This is a test",
                "This restaurant is great",
                "This restaurant is awful",
            ]

            def __len__(self):
                return 3

            def __getitem__(self, i):
                return self.data[i]

        text_classifier = pipeline(
            task="text-classification", model="hf-internal-testing/tiny-random-distilbert", framework="pt"
        )
        dataset = MyDataset()
        for output in text_classifier(dataset):
            self.assertEqual(output, {"label": ANY(str), "score": ANY(float)})

    @require_torch
    def test_check_task_auto_inference(self):
        pipe = pipeline(model="hf-internal-testing/tiny-random-distilbert")

        self.assertIsInstance(pipe, TextClassificationPipeline)

    @require_torch
    def test_pipeline_batch_size_global(self):
        pipe = pipeline(model="hf-internal-testing/tiny-random-distilbert")
        self.assertEqual(pipe._batch_size, None)
        self.assertEqual(pipe._num_workers, None)

        pipe = pipeline(model="hf-internal-testing/tiny-random-distilbert", batch_size=2, num_workers=1)
        self.assertEqual(pipe._batch_size, 2)
        self.assertEqual(pipe._num_workers, 1)

    @require_torch
    def test_pipeline_pathlike(self):
        pipe = pipeline(model="hf-internal-testing/tiny-random-distilbert")
        with tempfile.TemporaryDirectory() as d:
            pipe.save_pretrained(d)
            path = Path(d)
            newpipe = pipeline(task="text-classification", model=path)
        self.assertIsInstance(newpipe, TextClassificationPipeline)

    @require_torch
    def test_pipeline_override(self):
        class MyPipeline(TextClassificationPipeline):
            pass

        text_classifier = pipeline(model="hf-internal-testing/tiny-random-distilbert", pipeline_class=MyPipeline)

        self.assertIsInstance(text_classifier, MyPipeline)

    def test_check_task(self):
        task = get_task("gpt2")
        self.assertEqual(task, "text-generation")

        with self.assertRaises(RuntimeError):
            # Wrong framework
            get_task("espnet/siddhana_slurp_entity_asr_train_asr_conformer_raw_en_word_valid.acc.ave_10best")

    @require_torch
    def test_iterator_data(self):
        def data(n: int):
            for _ in range(n):
                yield "This is a test"

        pipe = pipeline(model="hf-internal-testing/tiny-random-distilbert")

        results = []
        for out in pipe(data(10)):
            self.assertEqual(nested_simplify(out), {"label": "LABEL_0", "score": 0.504})
            results.append(out)
        self.assertEqual(len(results), 10)

        # When using multiple workers on streamable data it should still work
        # This will force using `num_workers=1` with a warning for now.
        results = []
        for out in pipe(data(10), num_workers=2):
            self.assertEqual(nested_simplify(out), {"label": "LABEL_0", "score": 0.504})
            results.append(out)
        self.assertEqual(len(results), 10)

    @require_tf
    def test_iterator_data_tf(self):
        def data(n: int):
            for _ in range(n):
                yield "This is a test"

        pipe = pipeline(model="hf-internal-testing/tiny-random-distilbert", framework="tf")
        out = pipe("This is a test")
        results = []
        for out in pipe(data(10)):
            self.assertEqual(nested_simplify(out), {"label": "LABEL_0", "score": 0.504})
            results.append(out)
        self.assertEqual(len(results), 10)

    @require_torch
    def test_unbatch_attentions_hidden_states(self):
        model = DistilBertForSequenceClassification.from_pretrained(
            "hf-internal-testing/tiny-random-distilbert", output_hidden_states=True, output_attentions=True
        )
        tokenizer = AutoTokenizer.from_pretrained("hf-internal-testing/tiny-random-distilbert")
        text_classifier = TextClassificationPipeline(model=model, tokenizer=tokenizer)

        # Used to throw an error because `hidden_states` are a tuple of tensors
        # instead of the expected tensor.
        outputs = text_classifier(["This is great !"] * 20, batch_size=32)
        self.assertEqual(len(outputs), 20)


class PipelineScikitCompatTest(unittest.TestCase):
    @require_torch
    def test_pipeline_predict_pt(self):
        data = ["This is a test"]

        text_classifier = pipeline(
            task="text-classification", model="hf-internal-testing/tiny-random-distilbert", framework="pt"
        )

        expected_output = [{"label": ANY(str), "score": ANY(float)}]
        actual_output = text_classifier.predict(data)
        self.assertEqual(expected_output, actual_output)

    @require_tf
    def test_pipeline_predict_tf(self):
        data = ["This is a test"]

        text_classifier = pipeline(
            task="text-classification", model="hf-internal-testing/tiny-random-distilbert", framework="tf"
        )

        expected_output = [{"label": ANY(str), "score": ANY(float)}]
        actual_output = text_classifier.predict(data)
        self.assertEqual(expected_output, actual_output)

    @require_torch
    def test_pipeline_transform_pt(self):
        data = ["This is a test"]

        text_classifier = pipeline(
            task="text-classification", model="hf-internal-testing/tiny-random-distilbert", framework="pt"
        )

        expected_output = [{"label": ANY(str), "score": ANY(float)}]
        actual_output = text_classifier.transform(data)
        self.assertEqual(expected_output, actual_output)

    @require_tf
    def test_pipeline_transform_tf(self):
        data = ["This is a test"]

        text_classifier = pipeline(
            task="text-classification", model="hf-internal-testing/tiny-random-distilbert", framework="tf"
        )

        expected_output = [{"label": ANY(str), "score": ANY(float)}]
        actual_output = text_classifier.transform(data)
        self.assertEqual(expected_output, actual_output)


class PipelinePadTest(unittest.TestCase):
    @require_torch
    def test_pipeline_padding(self):
        import torch

        items = [
            {
                "label": "label1",
                "input_ids": torch.LongTensor([[1, 23, 24, 2]]),
                "attention_mask": torch.LongTensor([[0, 1, 1, 0]]),
            },
            {
                "label": "label2",
                "input_ids": torch.LongTensor([[1, 23, 24, 43, 44, 2]]),
                "attention_mask": torch.LongTensor([[0, 1, 1, 1, 1, 0]]),
            },
        ]

        self.assertEqual(_pad(items, "label", 0, "right"), ["label1", "label2"])
        self.assertTrue(
            torch.allclose(
                _pad(items, "input_ids", 10, "right"),
                torch.LongTensor([[1, 23, 24, 2, 10, 10], [1, 23, 24, 43, 44, 2]]),
            )
        )
        self.assertTrue(
            torch.allclose(
                _pad(items, "input_ids", 10, "left"),
                torch.LongTensor([[10, 10, 1, 23, 24, 2], [1, 23, 24, 43, 44, 2]]),
            )
        )
        self.assertTrue(
            torch.allclose(
                _pad(items, "attention_mask", 0, "right"), torch.LongTensor([[0, 1, 1, 0, 0, 0], [0, 1, 1, 1, 1, 0]])
            )
        )

    @require_torch
    def test_pipeline_image_padding(self):
        import torch

        items = [
            {
                "label": "label1",
                "pixel_values": torch.zeros((1, 3, 10, 10)),
            },
            {
                "label": "label2",
                "pixel_values": torch.zeros((1, 3, 10, 10)),
            },
        ]

        self.assertEqual(_pad(items, "label", 0, "right"), ["label1", "label2"])
        self.assertTrue(
            torch.allclose(
                _pad(items, "pixel_values", 10, "right"),
                torch.zeros((2, 3, 10, 10)),
            )
        )

    @require_torch
    def test_pipeline_offset_mapping(self):
        import torch

        items = [
            {
                "offset_mappings": torch.zeros([1, 11, 2], dtype=torch.long),
            },
            {
                "offset_mappings": torch.zeros([1, 4, 2], dtype=torch.long),
            },
        ]

        self.assertTrue(
            torch.allclose(
                _pad(items, "offset_mappings", 0, "right"),
                torch.zeros((2, 11, 2), dtype=torch.long),
            ),
        )


class PipelineUtilsTest(unittest.TestCase):
    @require_torch
    def test_pipeline_dataset(self):
        from transformers.pipelines.pt_utils import PipelineDataset

        dummy_dataset = [0, 1, 2, 3]

        def add(number, extra=0):
            return number + extra

        dataset = PipelineDataset(dummy_dataset, add, {"extra": 2})
        self.assertEqual(len(dataset), 4)
        outputs = [dataset[i] for i in range(4)]
        self.assertEqual(outputs, [2, 3, 4, 5])

    @require_torch
    def test_pipeline_iterator(self):
        from transformers.pipelines.pt_utils import PipelineIterator

        dummy_dataset = [0, 1, 2, 3]

        def add(number, extra=0):
            return number + extra

        dataset = PipelineIterator(dummy_dataset, add, {"extra": 2})
        self.assertEqual(len(dataset), 4)

        outputs = list(dataset)
        self.assertEqual(outputs, [2, 3, 4, 5])

    @require_torch
    def test_pipeline_iterator_no_len(self):
        from transformers.pipelines.pt_utils import PipelineIterator

        def dummy_dataset():
            for i in range(4):
                yield i

        def add(number, extra=0):
            return number + extra

        dataset = PipelineIterator(dummy_dataset(), add, {"extra": 2})
        with self.assertRaises(TypeError):
            len(dataset)

        outputs = list(dataset)
        self.assertEqual(outputs, [2, 3, 4, 5])

    @require_torch
    def test_pipeline_batch_unbatch_iterator(self):
        from transformers.pipelines.pt_utils import PipelineIterator

        dummy_dataset = [{"id": [0, 1, 2]}, {"id": [3]}]

        def add(number, extra=0):
            return {"id": [i + extra for i in number["id"]]}

        dataset = PipelineIterator(dummy_dataset, add, {"extra": 2}, loader_batch_size=3)

        outputs = list(dataset)
        self.assertEqual(outputs, [{"id": 2}, {"id": 3}, {"id": 4}, {"id": 5}])

    @require_torch
    def test_pipeline_batch_unbatch_iterator_tensors(self):
        import torch

        from transformers.pipelines.pt_utils import PipelineIterator

        dummy_dataset = [{"id": torch.LongTensor([[10, 20], [0, 1], [0, 2]])}, {"id": torch.LongTensor([[3]])}]

        def add(number, extra=0):
            return {"id": number["id"] + extra}

        dataset = PipelineIterator(dummy_dataset, add, {"extra": 2}, loader_batch_size=3)

        outputs = list(dataset)
        self.assertEqual(
            nested_simplify(outputs), [{"id": [[12, 22]]}, {"id": [[2, 3]]}, {"id": [[2, 4]]}, {"id": [[5]]}]
        )

    @require_torch
    def test_pipeline_chunk_iterator(self):
        from transformers.pipelines.pt_utils import PipelineChunkIterator

        def preprocess_chunk(n: int):
            for i in range(n):
                yield i

        dataset = [2, 3]

        dataset = PipelineChunkIterator(dataset, preprocess_chunk, {}, loader_batch_size=3)

        outputs = list(dataset)

        self.assertEqual(outputs, [0, 1, 0, 1, 2])

    @require_torch
    def test_pipeline_pack_iterator(self):
        from transformers.pipelines.pt_utils import PipelinePackIterator

        def pack(item):
            return {"id": item["id"] + 1, "is_last": item["is_last"]}

        dataset = [
            {"id": 0, "is_last": False},
            {"id": 1, "is_last": True},
            {"id": 0, "is_last": False},
            {"id": 1, "is_last": False},
            {"id": 2, "is_last": True},
        ]

        dataset = PipelinePackIterator(dataset, pack, {})

        outputs = list(dataset)
        self.assertEqual(
            outputs,
            [
                [
                    {"id": 1},
                    {"id": 2},
                ],
                [
                    {"id": 1},
                    {"id": 2},
                    {"id": 3},
                ],
            ],
        )

    @require_torch
    def test_pipeline_pack_unbatch_iterator(self):
        from transformers.pipelines.pt_utils import PipelinePackIterator

        dummy_dataset = [{"id": [0, 1, 2], "is_last": [False, True, False]}, {"id": [3], "is_last": [True]}]

        def add(number, extra=0):
            return {"id": [i + extra for i in number["id"]], "is_last": number["is_last"]}

        dataset = PipelinePackIterator(dummy_dataset, add, {"extra": 2}, loader_batch_size=3)

        outputs = list(dataset)
        self.assertEqual(outputs, [[{"id": 2}, {"id": 3}], [{"id": 4}, {"id": 5}]])

        # is_false Across batch
        dummy_dataset = [{"id": [0, 1, 2], "is_last": [False, False, False]}, {"id": [3], "is_last": [True]}]

        def add(number, extra=0):
            return {"id": [i + extra for i in number["id"]], "is_last": number["is_last"]}

        dataset = PipelinePackIterator(dummy_dataset, add, {"extra": 2}, loader_batch_size=3)

        outputs = list(dataset)
        self.assertEqual(outputs, [[{"id": 2}, {"id": 3}, {"id": 4}, {"id": 5}]])

    @slow
    @require_torch
    def test_load_default_pipelines_pt(self):
        import torch

        from transformers.pipelines import SUPPORTED_TASKS

        set_seed_fn = lambda: torch.manual_seed(0)  # noqa: E731
        for task in SUPPORTED_TASKS.keys():
            if task == "table-question-answering":
                # test table in seperate test due to more dependencies
                continue

            self.check_default_pipeline(task, "pt", set_seed_fn, self.check_models_equal_pt)

    @slow
    @require_tf
    def test_load_default_pipelines_tf(self):
        import tensorflow as tf

        from transformers.pipelines import SUPPORTED_TASKS

        set_seed_fn = lambda: tf.random.set_seed(0)  # noqa: E731
        for task in SUPPORTED_TASKS.keys():
            if task == "table-question-answering":
                # test table in seperate test due to more dependencies
                continue

            self.check_default_pipeline(task, "tf", set_seed_fn, self.check_models_equal_tf)

    @slow
    @require_torch
    def test_load_default_pipelines_pt_table_qa(self):
        import torch

        set_seed_fn = lambda: torch.manual_seed(0)  # noqa: E731
        self.check_default_pipeline("table-question-answering", "pt", set_seed_fn, self.check_models_equal_pt)

    @slow
    @require_tf
    @require_tensorflow_probability
    def test_load_default_pipelines_tf_table_qa(self):
        import tensorflow as tf

        set_seed_fn = lambda: tf.random.set_seed(0)  # noqa: E731
        self.check_default_pipeline("table-question-answering", "tf", set_seed_fn, self.check_models_equal_tf)

    def check_default_pipeline(self, task, framework, set_seed_fn, check_models_equal_fn):
        from transformers.pipelines import SUPPORTED_TASKS, pipeline

        task_dict = SUPPORTED_TASKS[task]
        # test to compare pipeline to manually loading the respective model
        model = None
        relevant_auto_classes = task_dict[framework]

        if len(relevant_auto_classes) == 0:
            # task has no default
            logger.debug(f"{task} in {framework} has no default")
            return

        # by default use first class
        auto_model_cls = relevant_auto_classes[0]

        # retrieve correct model ids
        if task == "translation":
            # special case for translation pipeline which has multiple languages
            model_ids = []
            revisions = []
            tasks = []
            for translation_pair in task_dict["default"].keys():
                model_id, revision = task_dict["default"][translation_pair]["model"][framework]

                model_ids.append(model_id)
                revisions.append(revision)
                tasks.append(task + f"_{'_to_'.join(translation_pair)}")
        else:
            # normal case - non-translation pipeline
            model_id, revision = task_dict["default"]["model"][framework]

            model_ids = [model_id]
            revisions = [revision]
            tasks = [task]

        # check for equality
        for model_id, revision, task in zip(model_ids, revisions, tasks):
            # load default model
            try:
                set_seed_fn()
                model = auto_model_cls.from_pretrained(model_id, revision=revision)
            except ValueError:
                # first auto class is possible not compatible with model, go to next model class
                auto_model_cls = relevant_auto_classes[1]
                set_seed_fn()
                model = auto_model_cls.from_pretrained(model_id, revision=revision)

            # load default pipeline
            set_seed_fn()
            default_pipeline = pipeline(task, framework=framework)

            # compare pipeline model with default model
            models_are_equal = check_models_equal_fn(default_pipeline.model, model)
            self.assertTrue(models_are_equal, f"{task} model doesn't match pipeline.")

            logger.debug(f"{task} in {framework} succeeded with {model_id}.")

    def check_models_equal_pt(self, model1, model2):
        models_are_equal = True
        for model1_p, model2_p in zip(model1.parameters(), model2.parameters()):
            if model1_p.data.ne(model2_p.data).sum() > 0:
                models_are_equal = False

        return models_are_equal

    def check_models_equal_tf(self, model1, model2):
        models_are_equal = True
        for model1_p, model2_p in zip(model1.weights, model2.weights):
            if np.abs(model1_p.numpy() - model2_p.numpy()).sum() > 1e-5:
                models_are_equal = False

        return models_are_equal


class CustomPipeline(Pipeline):
    def _sanitize_parameters(self, **kwargs):
        preprocess_kwargs = {}
        if "maybe_arg" in kwargs:
            preprocess_kwargs["maybe_arg"] = kwargs["maybe_arg"]
        return preprocess_kwargs, {}, {}

    def preprocess(self, text, maybe_arg=2):
        input_ids = self.tokenizer(text, return_tensors="pt")
        return input_ids

    def _forward(self, model_inputs):
        outputs = self.model(**model_inputs)
        return outputs

    def postprocess(self, model_outputs):
        return model_outputs["logits"].softmax(-1).numpy()


class CustomPipelineTest(unittest.TestCase):
    def test_warning_logs(self):
        transformers_logging.set_verbosity_debug()
        logger_ = transformers_logging.get_logger("transformers.pipelines.base")

        alias = "text-classification"
        # Get the original task, so we can restore it at the end.
        # (otherwise the subsequential tests in `TextClassificationPipelineTests` will fail)
        _, original_task, _ = PIPELINE_REGISTRY.check_task(alias)

        try:
            with CaptureLogger(logger_) as cm:
                PIPELINE_REGISTRY.register_pipeline(alias, PairClassificationPipeline)
            self.assertIn(f"{alias} is already registered", cm.out)
        finally:
            # restore
            PIPELINE_REGISTRY.supported_tasks[alias] = original_task

    def test_register_pipeline(self):
        PIPELINE_REGISTRY.register_pipeline(
            "custom-text-classification",
            pipeline_class=PairClassificationPipeline,
            pt_model=AutoModelForSequenceClassification if is_torch_available() else None,
            tf_model=TFAutoModelForSequenceClassification if is_tf_available() else None,
            default={"pt": "hf-internal-testing/tiny-random-distilbert"},
            type="text",
        )
        assert "custom-text-classification" in PIPELINE_REGISTRY.get_supported_tasks()

        _, task_def, _ = PIPELINE_REGISTRY.check_task("custom-text-classification")
        self.assertEqual(task_def["pt"], (AutoModelForSequenceClassification,) if is_torch_available() else ())
        self.assertEqual(task_def["tf"], (TFAutoModelForSequenceClassification,) if is_tf_available() else ())
        self.assertEqual(task_def["type"], "text")
        self.assertEqual(task_def["impl"], PairClassificationPipeline)
        self.assertEqual(task_def["default"], {"model": {"pt": "hf-internal-testing/tiny-random-distilbert"}})

        # Clean registry for next tests.
        del PIPELINE_REGISTRY.supported_tasks["custom-text-classification"]

    @require_torch_or_tf
    def test_dynamic_pipeline(self):
        PIPELINE_REGISTRY.register_pipeline(
            "pair-classification",
            pipeline_class=PairClassificationPipeline,
            pt_model=AutoModelForSequenceClassification if is_torch_available() else None,
            tf_model=TFAutoModelForSequenceClassification if is_tf_available() else None,
        )

        classifier = pipeline("pair-classification", model="hf-internal-testing/tiny-random-bert")

        # Clean registry as we won't need the pipeline to be in it for the rest to work.
        del PIPELINE_REGISTRY.supported_tasks["pair-classification"]

        with tempfile.TemporaryDirectory() as tmp_dir:
            classifier.save_pretrained(tmp_dir)
            # checks
            self.assertDictEqual(
                classifier.model.config.custom_pipelines,
                {
                    "pair-classification": {
                        "impl": "custom_pipeline.PairClassificationPipeline",
                        "pt": ("AutoModelForSequenceClassification",) if is_torch_available() else (),
                        "tf": ("TFAutoModelForSequenceClassification",) if is_tf_available() else (),
                    }
                },
            )
            # Fails if the user forget to pass along `trust_remote_code=True`
            with self.assertRaises(ValueError):
                _ = pipeline(model=tmp_dir)

            new_classifier = pipeline(model=tmp_dir, trust_remote_code=True)
            # Using trust_remote_code=False forces the traditional pipeline tag
            old_classifier = pipeline("text-classification", model=tmp_dir, trust_remote_code=False)
        # Can't make an isinstance check because the new_classifier is from the PairClassificationPipeline class of a
        # dynamic module
        self.assertEqual(new_classifier.__class__.__name__, "PairClassificationPipeline")
        self.assertEqual(new_classifier.task, "pair-classification")
        results = new_classifier("I hate you", second_text="I love you")
        self.assertDictEqual(
            nested_simplify(results),
            {"label": "LABEL_0", "score": 0.505, "logits": [-0.003, -0.024]},
        )

        self.assertEqual(old_classifier.__class__.__name__, "TextClassificationPipeline")
        self.assertEqual(old_classifier.task, "text-classification")
        results = old_classifier("I hate you", text_pair="I love you")
        self.assertListEqual(
            nested_simplify(results),
            [{"label": "LABEL_0", "score": 0.505}],
        )

    @require_torch_or_tf
    def test_cached_pipeline_has_minimum_calls_to_head(self):
        # Make sure we have cached the pipeline.
        _ = pipeline("text-classification", model="hf-internal-testing/tiny-random-bert")
        with RequestCounter() as counter:
            _ = pipeline("text-classification", model="hf-internal-testing/tiny-random-bert")
            self.assertEqual(counter.get_request_count, 0)
            self.assertEqual(counter.head_request_count, 1)
            self.assertEqual(counter.other_request_count, 0)

    @require_torch
    def test_chunk_pipeline_batching_single_file(self):
        # Make sure we have cached the pipeline.
        pipe = pipeline(model="hf-internal-testing/tiny-random-Wav2Vec2ForCTC")
        ds = datasets.load_dataset("hf-internal-testing/librispeech_asr_dummy", "clean", split="validation").sort("id")
        audio = ds[40]["audio"]["array"]

        pipe = pipeline(model="hf-internal-testing/tiny-random-Wav2Vec2ForCTC")
        # For some reason scoping doesn't work if not using `self.`
        self.COUNT = 0
        forward = pipe.model.forward

        def new_forward(*args, **kwargs):
            self.COUNT += 1
            return forward(*args, **kwargs)

        pipe.model.forward = new_forward

        for out in pipe(audio, return_timestamps="char", chunk_length_s=3, stride_length_s=[1, 1], batch_size=1024):
            pass

        self.assertEqual(self.COUNT, 1)


@require_torch
@is_staging_test
class DynamicPipelineTester(unittest.TestCase):
    vocab_tokens = ["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]", "I", "love", "hate", "you"]

    @classmethod
    def setUpClass(cls):
        cls._token = TOKEN
        set_access_token(TOKEN)
        HfFolder.save_token(TOKEN)

    @classmethod
    def tearDownClass(cls):
        try:
            delete_repo(token=cls._token, repo_id="test-dynamic-pipeline")
        except HTTPError:
            pass

    def test_push_to_hub_dynamic_pipeline(self):
        from transformers import BertConfig, BertForSequenceClassification, BertTokenizer

        PIPELINE_REGISTRY.register_pipeline(
            "pair-classification",
            pipeline_class=PairClassificationPipeline,
            pt_model=AutoModelForSequenceClassification,
        )

        config = BertConfig(
            vocab_size=99, hidden_size=32, num_hidden_layers=5, num_attention_heads=4, intermediate_size=37
        )
        model = BertForSequenceClassification(config).eval()

        with tempfile.TemporaryDirectory() as tmp_dir:
            create_repo(f"{USER}/test-dynamic-pipeline", token=self._token)
            repo = Repository(tmp_dir, clone_from=f"{USER}/test-dynamic-pipeline", token=self._token)

            vocab_file = os.path.join(tmp_dir, "vocab.txt")
            with open(vocab_file, "w", encoding="utf-8") as vocab_writer:
                vocab_writer.write("".join([x + "\n" for x in self.vocab_tokens]))
            tokenizer = BertTokenizer(vocab_file)

            classifier = pipeline("pair-classification", model=model, tokenizer=tokenizer)

            # Clean registry as we won't need the pipeline to be in it for the rest to work.
            del PIPELINE_REGISTRY.supported_tasks["pair-classification"]

            classifier.save_pretrained(tmp_dir)
            # checks
            self.assertDictEqual(
                classifier.model.config.custom_pipelines,
                {
                    "pair-classification": {
                        "impl": "custom_pipeline.PairClassificationPipeline",
                        "pt": ("AutoModelForSequenceClassification",),
                        "tf": (),
                    }
                },
            )

            repo.push_to_hub()

        # Fails if the user forget to pass along `trust_remote_code=True`
        with self.assertRaises(ValueError):
            _ = pipeline(model=f"{USER}/test-dynamic-pipeline")

        new_classifier = pipeline(model=f"{USER}/test-dynamic-pipeline", trust_remote_code=True)
        # Can't make an isinstance check because the new_classifier is from the PairClassificationPipeline class of a
        # dynamic module
        self.assertEqual(new_classifier.__class__.__name__, "PairClassificationPipeline")

        results = classifier("I hate you", second_text="I love you")
        new_results = new_classifier("I hate you", second_text="I love you")
        self.assertDictEqual(nested_simplify(results), nested_simplify(new_results))

        # Using trust_remote_code=False forces the traditional pipeline tag
        old_classifier = pipeline(
            "text-classification", model=f"{USER}/test-dynamic-pipeline", trust_remote_code=False
        )
        self.assertEqual(old_classifier.__class__.__name__, "TextClassificationPipeline")
        self.assertEqual(old_classifier.task, "text-classification")
        new_results = old_classifier("I hate you", text_pair="I love you")
        self.assertListEqual(
            nested_simplify([{"label": results["label"], "score": results["score"]}]), nested_simplify(new_results)
        )
