import os import os.path as osp from collections import OrderedDict from functools import reduce import annotator.uniformer.mmcv as mmcv import numpy as np from annotator.uniformer.mmcv.utils import print_log from prettytable import PrettyTable from torch.utils.data import Dataset from annotator.uniformer.mmseg.core import eval_metrics from annotator.uniformer.mmseg.utils import get_root_logger from .builder import DATASETS from .pipelines import Compose @DATASETS.register_module() class CustomDataset(Dataset): """Custom dataset for semantic segmentation. An example of file structure is as followed. .. code-block:: none ├── data │ ├── my_dataset │ │ ├── img_dir │ │ │ ├── train │ │ │ │ ├── xxx{img_suffix} │ │ │ │ ├── yyy{img_suffix} │ │ │ │ ├── zzz{img_suffix} │ │ │ ├── val │ │ ├── ann_dir │ │ │ ├── train │ │ │ │ ├── xxx{seg_map_suffix} │ │ │ │ ├── yyy{seg_map_suffix} │ │ │ │ ├── zzz{seg_map_suffix} │ │ │ ├── val The img/gt_semantic_seg pair of CustomDataset should be of the same except suffix. A valid img/gt_semantic_seg filename pair should be like ``xxx{img_suffix}`` and ``xxx{seg_map_suffix}`` (extension is also included in the suffix). If split is given, then ``xxx`` is specified in txt file. Otherwise, all files in ``img_dir/``and ``ann_dir`` will be loaded. Please refer to ``docs/tutorials/new_dataset.md`` for more details. Args: pipeline (list[dict]): Processing pipeline img_dir (str): Path to image directory img_suffix (str): Suffix of images. Default: '.jpg' ann_dir (str, optional): Path to annotation directory. Default: None seg_map_suffix (str): Suffix of segmentation maps. Default: '.png' split (str, optional): Split txt file. If split is specified, only file with suffix in the splits will be loaded. Otherwise, all images in img_dir/ann_dir will be loaded. Default: None data_root (str, optional): Data root for img_dir/ann_dir. Default: None. test_mode (bool): If test_mode=True, gt wouldn't be loaded. ignore_index (int): The label index to be ignored. Default: 255 reduce_zero_label (bool): Whether to mark label zero as ignored. Default: False classes (str | Sequence[str], optional): Specify classes to load. If is None, ``cls.CLASSES`` will be used. Default: None. palette (Sequence[Sequence[int]]] | np.ndarray | None): The palette of segmentation map. If None is given, and self.PALETTE is None, random palette will be generated. Default: None """ CLASSES = None PALETTE = None def __init__(self, pipeline, img_dir, img_suffix='.jpg', ann_dir=None, seg_map_suffix='.png', split=None, data_root=None, test_mode=False, ignore_index=255, reduce_zero_label=False, classes=None, palette=None): self.pipeline = Compose(pipeline) self.img_dir = img_dir self.img_suffix = img_suffix self.ann_dir = ann_dir self.seg_map_suffix = seg_map_suffix self.split = split self.data_root = data_root self.test_mode = test_mode self.ignore_index = ignore_index self.reduce_zero_label = reduce_zero_label self.label_map = None self.CLASSES, self.PALETTE = self.get_classes_and_palette( classes, palette) # join paths if data_root is specified if self.data_root is not None: if not osp.isabs(self.img_dir): self.img_dir = osp.join(self.data_root, self.img_dir) if not (self.ann_dir is None or osp.isabs(self.ann_dir)): self.ann_dir = osp.join(self.data_root, self.ann_dir) if not (self.split is None or osp.isabs(self.split)): self.split = osp.join(self.data_root, self.split) # load annotations self.img_infos = self.load_annotations(self.img_dir, self.img_suffix, self.ann_dir, self.seg_map_suffix, self.split) def __len__(self): """Total number of samples of data.""" return len(self.img_infos) def load_annotations(self, img_dir, img_suffix, ann_dir, seg_map_suffix, split): """Load annotation from directory. Args: img_dir (str): Path to image directory img_suffix (str): Suffix of images. ann_dir (str|None): Path to annotation directory. seg_map_suffix (str|None): Suffix of segmentation maps. split (str|None): Split txt file. If split is specified, only file with suffix in the splits will be loaded. Otherwise, all images in img_dir/ann_dir will be loaded. Default: None Returns: list[dict]: All image info of dataset. """ img_infos = [] if split is not None: with open(split) as f: for line in f: img_name = line.strip() img_info = dict(filename=img_name + img_suffix) if ann_dir is not None: seg_map = img_name + seg_map_suffix img_info['ann'] = dict(seg_map=seg_map) img_infos.append(img_info) else: for img in mmcv.scandir(img_dir, img_suffix, recursive=True): img_info = dict(filename=img) if ann_dir is not None: seg_map = img.replace(img_suffix, seg_map_suffix) img_info['ann'] = dict(seg_map=seg_map) img_infos.append(img_info) print_log(f'Loaded {len(img_infos)} images', logger=get_root_logger()) return img_infos def get_ann_info(self, idx): """Get annotation by index. Args: idx (int): Index of data. Returns: dict: Annotation info of specified index. """ return self.img_infos[idx]['ann'] def pre_pipeline(self, results): """Prepare results dict for pipeline.""" results['seg_fields'] = [] results['img_prefix'] = self.img_dir results['seg_prefix'] = self.ann_dir if self.custom_classes: results['label_map'] = self.label_map def __getitem__(self, idx): """Get training/test data after pipeline. Args: idx (int): Index of data. Returns: dict: Training/test data (with annotation if `test_mode` is set False). """ if self.test_mode: return self.prepare_test_img(idx) else: return self.prepare_train_img(idx) def prepare_train_img(self, idx): """Get training data and annotations after pipeline. Args: idx (int): Index of data. Returns: dict: Training data and annotation after pipeline with new keys introduced by pipeline. """ img_info = self.img_infos[idx] ann_info = self.get_ann_info(idx) results = dict(img_info=img_info, ann_info=ann_info) self.pre_pipeline(results) return self.pipeline(results) def prepare_test_img(self, idx): """Get testing data after pipeline. Args: idx (int): Index of data. Returns: dict: Testing data after pipeline with new keys introduced by pipeline. """ img_info = self.img_infos[idx] results = dict(img_info=img_info) self.pre_pipeline(results) return self.pipeline(results) def format_results(self, results, **kwargs): """Place holder to format result to dataset specific output.""" def get_gt_seg_maps(self, efficient_test=False): """Get ground truth segmentation maps for evaluation.""" gt_seg_maps = [] for img_info in self.img_infos: seg_map = osp.join(self.ann_dir, img_info['ann']['seg_map']) if efficient_test: gt_seg_map = seg_map else: gt_seg_map = mmcv.imread( seg_map, flag='unchanged', backend='pillow') gt_seg_maps.append(gt_seg_map) return gt_seg_maps def get_classes_and_palette(self, classes=None, palette=None): """Get class names of current dataset. Args: classes (Sequence[str] | str | None): If classes is None, use default CLASSES defined by builtin dataset. If classes is a string, take it as a file name. The file contains the name of classes where each line contains one class name. If classes is a tuple or list, override the CLASSES defined by the dataset. palette (Sequence[Sequence[int]]] | np.ndarray | None): The palette of segmentation map. If None is given, random palette will be generated. Default: None """ if classes is None: self.custom_classes = False return self.CLASSES, self.PALETTE self.custom_classes = True if isinstance(classes, str): # take it as a file path class_names = mmcv.list_from_file(classes) elif isinstance(classes, (tuple, list)): class_names = classes else: raise ValueError(f'Unsupported type {type(classes)} of classes.') if self.CLASSES: if not set(classes).issubset(self.CLASSES): raise ValueError('classes is not a subset of CLASSES.') # dictionary, its keys are the old label ids and its values # are the new label ids. # used for changing pixel labels in load_annotations. self.label_map = {} for i, c in enumerate(self.CLASSES): if c not in class_names: self.label_map[i] = -1 else: self.label_map[i] = classes.index(c) palette = self.get_palette_for_custom_classes(class_names, palette) return class_names, palette def get_palette_for_custom_classes(self, class_names, palette=None): if self.label_map is not None: # return subset of palette palette = [] for old_id, new_id in sorted( self.label_map.items(), key=lambda x: x[1]): if new_id != -1: palette.append(self.PALETTE[old_id]) palette = type(self.PALETTE)(palette) elif palette is None: if self.PALETTE is None: palette = np.random.randint(0, 255, size=(len(class_names), 3)) else: palette = self.PALETTE return palette def evaluate(self, results, metric='mIoU', logger=None, efficient_test=False, **kwargs): """Evaluate the dataset. Args: results (list): Testing results of the dataset. metric (str | list[str]): Metrics to be evaluated. 'mIoU', 'mDice' and 'mFscore' are supported. logger (logging.Logger | None | str): Logger used for printing related information during evaluation. Default: None. Returns: dict[str, float]: Default metrics. """ if isinstance(metric, str): metric = [metric] allowed_metrics = ['mIoU', 'mDice', 'mFscore'] if not set(metric).issubset(set(allowed_metrics)): raise KeyError('metric {} is not supported'.format(metric)) eval_results = {} gt_seg_maps = self.get_gt_seg_maps(efficient_test) if self.CLASSES is None: num_classes = len( reduce(np.union1d, [np.unique(_) for _ in gt_seg_maps])) else: num_classes = len(self.CLASSES) ret_metrics = eval_metrics( results, gt_seg_maps, num_classes, self.ignore_index, metric, label_map=self.label_map, reduce_zero_label=self.reduce_zero_label) if self.CLASSES is None: class_names = tuple(range(num_classes)) else: class_names = self.CLASSES # summary table ret_metrics_summary = OrderedDict({ ret_metric: np.round(np.nanmean(ret_metric_value) * 100, 2) for ret_metric, ret_metric_value in ret_metrics.items() }) # each class table ret_metrics.pop('aAcc', None) ret_metrics_class = OrderedDict({ ret_metric: np.round(ret_metric_value * 100, 2) for ret_metric, ret_metric_value in ret_metrics.items() }) ret_metrics_class.update({'Class': class_names}) ret_metrics_class.move_to_end('Class', last=False) # for logger class_table_data = PrettyTable() for key, val in ret_metrics_class.items(): class_table_data.add_column(key, val) summary_table_data = PrettyTable() for key, val in ret_metrics_summary.items(): if key == 'aAcc': summary_table_data.add_column(key, [val]) else: summary_table_data.add_column('m' + key, [val]) print_log('per class results:', logger) print_log('\n' + class_table_data.get_string(), logger=logger) print_log('Summary:', logger) print_log('\n' + summary_table_data.get_string(), logger=logger) # each metric dict for key, value in ret_metrics_summary.items(): if key == 'aAcc': eval_results[key] = value / 100.0 else: eval_results['m' + key] = value / 100.0 ret_metrics_class.pop('Class', None) for key, value in ret_metrics_class.items(): eval_results.update({ key + '.' + str(name): value[idx] / 100.0 for idx, name in enumerate(class_names) }) if mmcv.is_list_of(results, str): for file_name in results: os.remove(file_name) return eval_results