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import numpy as np
from ..builder import PIPELINES
@PIPELINES.register_module()
class InstaBoost(object):
r"""Data augmentation method in `InstaBoost: Boosting Instance
Segmentation Via Probability Map Guided Copy-Pasting
<https://arxiv.org/abs/1908.07801>`_.
Refer to https://github.com/GothicAi/Instaboost for implementation details.
"""
def __init__(self,
action_candidate=('normal', 'horizontal', 'skip'),
action_prob=(1, 0, 0),
scale=(0.8, 1.2),
dx=15,
dy=15,
theta=(-1, 1),
color_prob=0.5,
hflag=False,
aug_ratio=0.5):
try:
import instaboostfast as instaboost
except ImportError:
raise ImportError(
'Please run "pip install instaboostfast" '
'to install instaboostfast first for instaboost augmentation.')
self.cfg = instaboost.InstaBoostConfig(action_candidate, action_prob,
scale, dx, dy, theta,
color_prob, hflag)
self.aug_ratio = aug_ratio
def _load_anns(self, results):
labels = results['ann_info']['labels']
masks = results['ann_info']['masks']
bboxes = results['ann_info']['bboxes']
n = len(labels)
anns = []
for i in range(n):
label = labels[i]
bbox = bboxes[i]
mask = masks[i]
x1, y1, x2, y2 = bbox
# assert (x2 - x1) >= 1 and (y2 - y1) >= 1
bbox = [x1, y1, x2 - x1, y2 - y1]
anns.append({
'category_id': label,
'segmentation': mask,
'bbox': bbox
})
return anns
def _parse_anns(self, results, anns, img):
gt_bboxes = []
gt_labels = []
gt_masks_ann = []
for ann in anns:
x1, y1, w, h = ann['bbox']
# TODO: more essential bug need to be fixed in instaboost
if w <= 0 or h <= 0:
continue
bbox = [x1, y1, x1 + w, y1 + h]
gt_bboxes.append(bbox)
gt_labels.append(ann['category_id'])
gt_masks_ann.append(ann['segmentation'])
gt_bboxes = np.array(gt_bboxes, dtype=np.float32)
gt_labels = np.array(gt_labels, dtype=np.int64)
results['ann_info']['labels'] = gt_labels
results['ann_info']['bboxes'] = gt_bboxes
results['ann_info']['masks'] = gt_masks_ann
results['img'] = img
return results
def __call__(self, results):
img = results['img']
orig_type = img.dtype
anns = self._load_anns(results)
if np.random.choice([0, 1], p=[1 - self.aug_ratio, self.aug_ratio]):
try:
import instaboostfast as instaboost
except ImportError:
raise ImportError('Please run "pip install instaboostfast" '
'to install instaboostfast first.')
anns, img = instaboost.get_new_data(
anns, img.astype(np.uint8), self.cfg, background=None)
results = self._parse_anns(results, anns, img.astype(orig_type))
return results
def __repr__(self):
repr_str = self.__class__.__name__
repr_str += f'(cfg={self.cfg}, aug_ratio={self.aug_ratio})'
return repr_str
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