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# Ultralytics YOLO 🚀, GPL-3.0 license
import collections
from copy import deepcopy
from .augment import LetterBox
class MixAndRectDataset:
"""A wrapper of multiple images mixed dataset.
Args:
dataset (:obj:`BaseDataset`): The dataset to be mixed.
transforms (Sequence[dict]): config dict to be composed.
"""
def __init__(self, dataset):
self.dataset = dataset
self.imgsz = dataset.imgsz
def __len__(self):
return len(self.dataset)
def __getitem__(self, index):
labels = deepcopy(self.dataset[index])
for transform in self.dataset.transforms.tolist():
# mosaic and mixup
if hasattr(transform, 'get_indexes'):
indexes = transform.get_indexes(self.dataset)
if not isinstance(indexes, collections.abc.Sequence):
indexes = [indexes]
mix_labels = [deepcopy(self.dataset[index]) for index in indexes]
labels['mix_labels'] = mix_labels
if self.dataset.rect and isinstance(transform, LetterBox):
transform.new_shape = self.dataset.batch_shapes[self.dataset.batch[index]]
labels = transform(labels)
if 'mix_labels' in labels:
labels.pop('mix_labels')
return labels
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