Face Detection Task (task-a-thon) (#606)

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* merging taskathon PR code

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* Update flash/image/face_detection/model.py

Co-authored-by: Sean Naren <sean@grid.ai>

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* added comments to clearfy some steps in the face detection task

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Co-authored-by: ananyahjha93 <ananya@pytorchlightning.ai>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sean Naren <sean@grid.ai>
Co-authored-by: thomas chaton <thomas@grid.ai>

CHANGELOG.md

@@ -16,6 +16,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Added support for `from_data_frame` to `TextClassificationData` ([#785](https://github.com/PyTorchLightning/lightning-flash/pull/785))
 
+- Added `FastFace` integration ([#606](https://github.com/PyTorchLightning/lightning-flash/pull/606))
+
 - Added support for `from_lists` to `TextClassificationData` ([#805](https://github.com/PyTorchLightning/lightning-flash/pull/805))
 
 ### Changed

flash/core/data/utils.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import os.path
+import tarfile
 import zipfile
 from typing import Any, Callable, Dict, Iterable, Mapping, Optional, Set, Type
 
@@ -148,10 +149,23 @@ def download_data(url: str, path: str = "data/", verbose: bool = False) -> None:
             ):
                 fp.write(chunk)  # type: ignore
 
+    def extract_tarfile(file_path: str, extract_path: str, mode: str):
+        if os.path.exists(file_path):
+            with tarfile.open(file_path, mode=mode) as tar_ref:
+                for member in tar_ref.getmembers():
+                    try:
+                        tar_ref.extract(member, path=extract_path, set_attrs=False)
+                    except PermissionError:
+                        raise PermissionError(f"Could not extract tar file {file_path}")
+
     if ".zip" in local_filename:
         if os.path.exists(local_filename):
             with zipfile.ZipFile(local_filename, "r") as zip_ref:
                 zip_ref.extractall(path)
+    elif local_filename.endswith(".tar.gz") or local_filename.endswith(".tgz"):
+        extract_tarfile(local_filename, path, "r:gz")
+    elif local_filename.endswith(".tar.bz2") or local_filename.endswith(".tbz"):
+        extract_tarfile(local_filename, path, "r:bz2")
 
 
 def _contains_any_tensor(value: Any, dtype: Type = Tensor) -> bool:

flash/core/utilities/imports.py

@@ -87,6 +87,7 @@ def _compare_version(package: str, op, version) -> bool:
 _PIL_AVAILABLE = _module_available("PIL")
 _OPEN3D_AVAILABLE = _module_available("open3d")
 _SEGMENTATION_MODELS_AVAILABLE = _module_available("segmentation_models_pytorch")
+_FASTFACE_AVAILABLE = _module_available("fastface")
 _LIBROSA_AVAILABLE = _module_available("librosa")
 _TORCH_SCATTER_AVAILABLE = _module_available("torch_scatter")
 _TORCH_SPARSE_AVAILABLE = _module_available("torch_sparse")

flash/image/__init__.py

@@ -6,6 +6,7 @@
 from flash.image.classification.backbones import IMAGE_CLASSIFIER_BACKBONES  # noqa: F401
 from flash.image.detection import ObjectDetectionData, ObjectDetector  # noqa: F401
 from flash.image.embedding import ImageEmbedder  # noqa: F401
+from flash.image.face_detection import FaceDetectionData, FaceDetector  # noqa: F401
 from flash.image.instance_segmentation import InstanceSegmentation, InstanceSegmentationData  # noqa: F401
 from flash.image.keypoint_detection import KeypointDetectionData, KeypointDetector  # noqa: F401
 from flash.image.segmentation import (  # noqa: F401

flash/image/face_detection/__init__.py

@@ -0,0 +1,2 @@
+from flash.image.face_detection.data import FaceDetectionData  # noqa: F401
+from flash.image.face_detection.model import FaceDetector  # noqa: F401

flash/image/face_detection/backbones/__init__.py

@@ -0,0 +1,5 @@
+from flash.core.registry import FlashRegistry  # noqa: F401
+from flash.image.face_detection.backbones.fastface_backbones import register_ff_backbones  # noqa: F401
+
+FACE_DETECTION_BACKBONES = FlashRegistry("face_detection_backbones")
+register_ff_backbones(FACE_DETECTION_BACKBONES)

flash/image/face_detection/backbones/fastface_backbones.py

@@ -0,0 +1,44 @@
+# Copyright The PyTorch Lightning 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.
+from functools import partial
+
+from flash.core.registry import FlashRegistry
+from flash.core.utilities.imports import _FASTFACE_AVAILABLE
+
+if _FASTFACE_AVAILABLE:
+    import fastface as ff
+
+    _MODEL_NAMES = ff.list_pretrained_models()
+else:
+    _MODEL_NAMES = []
+
+
+def fastface_backbone(model_name: str, pretrained: bool, **kwargs):
+    if pretrained:
+        pl_model = ff.FaceDetector.from_pretrained(model_name, **kwargs)
+    else:
+        arch, config = model_name.split("_")
+        pl_model = ff.FaceDetector.build(arch, config, **kwargs)
+
+    backbone = getattr(pl_model, "arch")
+
+    return backbone, pl_model
+
+
+def register_ff_backbones(register: FlashRegistry):
+    if _FASTFACE_AVAILABLE:
+        backbones = [partial(fastface_backbone, model_name=name) for name in _MODEL_NAMES]
+
+        for idx, backbone in enumerate(backbones):
+            register(backbone, name=_MODEL_NAMES[idx])

flash/image/face_detection/data.py

@@ -0,0 +1,172 @@
+# Copyright The PyTorch Lightning 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.
+from typing import Any, Callable, Dict, Mapping, Optional, Sequence, Tuple
+
+import torch
+import torch.nn as nn
+from torch.utils.data import Dataset
+
+from flash.core.data.data_source import DatasetDataSource, DefaultDataKeys, DefaultDataSources
+from flash.core.data.process import Postprocess, Preprocess
+from flash.core.data.transforms import ApplyToKeys
+from flash.core.utilities.imports import _FASTFACE_AVAILABLE, _TORCHVISION_AVAILABLE
+from flash.image.data import ImagePathsDataSource
+from flash.image.detection import ObjectDetectionData
+
+if _TORCHVISION_AVAILABLE:
+    import torchvision
+    from torchvision.datasets.folder import default_loader
+
+if _FASTFACE_AVAILABLE:
+    import fastface as ff
+
+
+def fastface_collate_fn(samples: Sequence[Dict[str, Any]]) -> Dict[str, Sequence[Any]]:
+    """Collate function from fastface.
+
+    Organizes individual elements in a batch, calls prepare_batch from fastface and prepares the targets.
+    """
+    samples = {key: [sample[key] for sample in samples] for key in samples[0]}
+
+    images, scales, paddings = ff.utils.preprocess.prepare_batch(
+        samples[DefaultDataKeys.INPUT], None, adaptive_batch=True
+    )
+
+    samples["scales"] = scales
+    samples["paddings"] = paddings
+
+    if DefaultDataKeys.TARGET in samples.keys():
+        targets = samples[DefaultDataKeys.TARGET]
+        targets = [{"target_boxes": target["boxes"]} for target in targets]
+
+        for i, (target, scale, padding) in enumerate(zip(targets, scales, paddings)):
+            target["target_boxes"] *= scale
+            target["target_boxes"][:, [0, 2]] += padding[0]
+            target["target_boxes"][:, [1, 3]] += padding[1]
+            targets[i]["target_boxes"] = target["target_boxes"]
+
+        samples[DefaultDataKeys.TARGET] = targets
+    samples[DefaultDataKeys.INPUT] = images
+
+    return samples
+
+
+class FastFaceDataSource(DatasetDataSource):
+    """Logic for loading from FDDBDataset."""
+
+    def load_data(self, data: Dataset, dataset: Any = None) -> Dataset:
+        new_data = []
+        for img_file_path, targets in zip(data.ids, data.targets):
+            new_data.append(
+                super().load_sample(
+                    (
+                        img_file_path,
+                        dict(
+                            boxes=targets["target_boxes"],
+                            # label `1` indicates positive sample
+                            labels=[1 for _ in range(targets["target_boxes"].shape[0])],
+                        ),
+                    )
+                )
+            )
+
+        return new_data
+
+    def load_sample(self, sample: Any, dataset: Optional[Any] = None) -> Mapping[str, Any]:
+        filepath = sample[DefaultDataKeys.INPUT]
+        img = default_loader(filepath)
+        sample[DefaultDataKeys.INPUT] = img
+
+        w, h = img.size  # WxH
+        sample[DefaultDataKeys.METADATA] = {
+            "filepath": filepath,
+            "size": (h, w),
+        }
+
+        return sample
+
+
+class FaceDetectionPreprocess(Preprocess):
+    """Applies default transform and collate_fn for fastface on FastFaceDataSource."""
+
+    def __init__(
+        self,
+        train_transform: Optional[Dict[str, Callable]] = None,
+        val_transform: Optional[Dict[str, Callable]] = None,
+        test_transform: Optional[Dict[str, Callable]] = None,
+        predict_transform: Optional[Dict[str, Callable]] = None,
+        image_size: Tuple[int, int] = (128, 128),
+    ):
+        self.image_size = image_size
+
+        super().__init__(
+            train_transform=train_transform,
+            val_transform=val_transform,
+            test_transform=test_transform,
+            predict_transform=predict_transform,
+            data_sources={
+                DefaultDataSources.FILES: ImagePathsDataSource(),
+                DefaultDataSources.FOLDERS: ImagePathsDataSource(),
+                DefaultDataSources.DATASETS: FastFaceDataSource(),
+            },
+            default_data_source=DefaultDataSources.FILES,
+        )
+
+    def get_state_dict(self) -> Dict[str, Any]:
+        return {**self.transforms}
+
+    @classmethod
+    def load_state_dict(cls, state_dict: Dict[str, Any], strict: bool = False):
+        return cls(**state_dict)
+
+    def default_transforms(self) -> Dict[str, Callable]:
+        return {
+            "to_tensor_transform": nn.Sequential(
+                ApplyToKeys(DefaultDataKeys.INPUT, torchvision.transforms.ToTensor()),
+                ApplyToKeys(
+                    DefaultDataKeys.TARGET,
+                    nn.Sequential(
+                        ApplyToKeys("boxes", torch.as_tensor),
+                        ApplyToKeys("labels", torch.as_tensor),
+                    ),
+                ),
+            ),
+            "collate": fastface_collate_fn,
+        }
+
+
+class FaceDetectionPostProcess(Postprocess):
+    """Generates preds from model output."""
+
+    @staticmethod
+    def per_batch_transform(batch: Any) -> Any:
+        scales = batch["scales"]
+        paddings = batch["paddings"]
+
+        batch.pop("scales", None)
+        batch.pop("paddings", None)
+
+        preds = batch[DefaultDataKeys.PREDS]
+
+        # preds: list of torch.Tensor(N, 5) as x1, y1, x2, y2, score
+        preds = [preds[preds[:, 5] == batch_idx, :5] for batch_idx in range(len(preds))]
+        preds = ff.utils.preprocess.adjust_results(preds, scales, paddings)
+        batch[DefaultDataKeys.PREDS] = preds
+
+        return batch
+
+
+class FaceDetectionData(ObjectDetectionData):
+    preprocess_cls = FaceDetectionPreprocess
+    postprocess_cls = FaceDetectionPostProcess