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Source code for torchvision.datasets.widerface

import os
from os.path import abspath, expanduser
from typing import Any, Callable, List, Dict, Optional, Tuple, Union

import torch
from PIL import Image

from .utils import (
    download_file_from_google_drive,
    download_and_extract_archive,
    extract_archive,
    verify_str_arg,
)
from .vision import VisionDataset


[docs]class WIDERFace(VisionDataset): """`WIDERFace <http://shuoyang1213.me/WIDERFACE/>`_ Dataset. Args: root (string): Root directory where images and annotations are downloaded to. Expects the following folder structure if download=False: .. code:: <root> └── widerface ├── wider_face_split ('wider_face_split.zip' if compressed) ├── WIDER_train ('WIDER_train.zip' if compressed) ├── WIDER_val ('WIDER_val.zip' if compressed) └── WIDER_test ('WIDER_test.zip' if compressed) split (string): The dataset split to use. One of {``train``, ``val``, ``test``}. Defaults to ``train``. transform (callable, optional): A function/transform that takes in a PIL image and returns a transformed version. E.g, ``transforms.RandomCrop`` target_transform (callable, optional): A function/transform that takes in the target and transforms it. download (bool, optional): If true, downloads the dataset from the internet and puts it in root directory. If dataset is already downloaded, it is not downloaded again. """ BASE_FOLDER = "widerface" FILE_LIST = [ # File ID MD5 Hash Filename ("15hGDLhsx8bLgLcIRD5DhYt5iBxnjNF1M", "3fedf70df600953d25982bcd13d91ba2", "WIDER_train.zip"), ("1GUCogbp16PMGa39thoMMeWxp7Rp5oM8Q", "dfa7d7e790efa35df3788964cf0bbaea", "WIDER_val.zip"), ("1HIfDbVEWKmsYKJZm4lchTBDLW5N7dY5T", "e5d8f4248ed24c334bbd12f49c29dd40", "WIDER_test.zip"), ] ANNOTATIONS_FILE = ( "http://shuoyang1213.me/WIDERFACE/support/bbx_annotation/wider_face_split.zip", "0e3767bcf0e326556d407bf5bff5d27c", "wider_face_split.zip", ) def __init__( self, root: str, split: str = "train", transform: Optional[Callable] = None, target_transform: Optional[Callable] = None, download: bool = False, ) -> None: super().__init__( root=os.path.join(root, self.BASE_FOLDER), transform=transform, target_transform=target_transform ) # check arguments self.split = verify_str_arg(split, "split", ("train", "val", "test")) if download: self.download() if not self._check_integrity(): raise RuntimeError("Dataset not found or corrupted. You can use download=True to download and prepare it") self.img_info: List[Dict[str, Union[str, Dict[str, torch.Tensor]]]] = [] if self.split in ("train", "val"): self.parse_train_val_annotations_file() else: self.parse_test_annotations_file()
[docs] def __getitem__(self, index: int) -> Tuple[Any, Any]: """ Args: index (int): Index Returns: tuple: (image, target) where target is a dict of annotations for all faces in the image. target=None for the test split. """ # stay consistent with other datasets and return a PIL Image img = Image.open(self.img_info[index]["img_path"]) if self.transform is not None: img = self.transform(img) target = None if self.split == "test" else self.img_info[index]["annotations"] if self.target_transform is not None: target = self.target_transform(target) return img, target
def __len__(self) -> int: return len(self.img_info) def extra_repr(self) -> str: lines = ["Split: {split}"] return "\n".join(lines).format(**self.__dict__) def parse_train_val_annotations_file(self) -> None: filename = "wider_face_train_bbx_gt.txt" if self.split == "train" else "wider_face_val_bbx_gt.txt" filepath = os.path.join(self.root, "wider_face_split", filename) with open(filepath) as f: lines = f.readlines() file_name_line, num_boxes_line, box_annotation_line = True, False, False num_boxes, box_counter = 0, 0 labels = [] for line in lines: line = line.rstrip() if file_name_line: img_path = os.path.join(self.root, "WIDER_" + self.split, "images", line) img_path = abspath(expanduser(img_path)) file_name_line = False num_boxes_line = True elif num_boxes_line: num_boxes = int(line) num_boxes_line = False box_annotation_line = True elif box_annotation_line: box_counter += 1 line_split = line.split(" ") line_values = [int(x) for x in line_split] labels.append(line_values) if box_counter >= num_boxes: box_annotation_line = False file_name_line = True labels_tensor = torch.tensor(labels) self.img_info.append( { "img_path": img_path, "annotations": { "bbox": labels_tensor[:, 0:4], # x, y, width, height "blur": labels_tensor[:, 4], "expression": labels_tensor[:, 5], "illumination": labels_tensor[:, 6], "occlusion": labels_tensor[:, 7], "pose": labels_tensor[:, 8], "invalid": labels_tensor[:, 9], }, } ) box_counter = 0 labels.clear() else: raise RuntimeError(f"Error parsing annotation file {filepath}") def parse_test_annotations_file(self) -> None: filepath = os.path.join(self.root, "wider_face_split", "wider_face_test_filelist.txt") filepath = abspath(expanduser(filepath)) with open(filepath) as f: lines = f.readlines() for line in lines: line = line.rstrip() img_path = os.path.join(self.root, "WIDER_test", "images", line) img_path = abspath(expanduser(img_path)) self.img_info.append({"img_path": img_path}) def _check_integrity(self) -> bool: # Allow original archive to be deleted (zip). Only need the extracted images all_files = self.FILE_LIST.copy() all_files.append(self.ANNOTATIONS_FILE) for (_, md5, filename) in all_files: file, ext = os.path.splitext(filename) extracted_dir = os.path.join(self.root, file) if not os.path.exists(extracted_dir): return False return True def download(self) -> None: if self._check_integrity(): print("Files already downloaded and verified") return # download and extract image data for (file_id, md5, filename) in self.FILE_LIST: download_file_from_google_drive(file_id, self.root, filename, md5) filepath = os.path.join(self.root, filename) extract_archive(filepath) # download and extract annotation files download_and_extract_archive( url=self.ANNOTATIONS_FILE[0], download_root=self.root, md5=self.ANNOTATIONS_FILE[1] )

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