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# Copyright (c) OpenMMLab. All rights reserved.
import warnings
import mmcv
from ..builder import PIPELINES
from .compose import Compose
@PIPELINES.register_module()
class MultiScaleFlipAug:
"""Test-time augmentation with multiple scales and flipping.
An example configuration is as followed:
.. code-block::
img_scale=[(1333, 400), (1333, 800)],
flip=True,
transforms=[
dict(type='Resize', keep_ratio=True),
dict(type='RandomFlip'),
dict(type='Normalize', **img_norm_cfg),
dict(type='Pad', size_divisor=32),
dict(type='ImageToTensor', keys=['img']),
dict(type='Collect', keys=['img']),
]
After MultiScaleFLipAug with above configuration, the results are wrapped
into lists of the same length as followed:
.. code-block::
dict(
img=[...],
img_shape=[...],
scale=[(1333, 400), (1333, 400), (1333, 800), (1333, 800)]
flip=[False, True, False, True]
...
)
Args:
transforms (list[dict]): Transforms to apply in each augmentation.
img_scale (tuple | list[tuple] | None): Images scales for resizing.
scale_factor (float | list[float] | None): Scale factors for resizing.
flip (bool): Whether apply flip augmentation. Default: False.
flip_direction (str | list[str]): Flip augmentation directions,
options are "horizontal", "vertical" and "diagonal". If
flip_direction is a list, multiple flip augmentations will be
applied. It has no effect when flip == False. Default:
"horizontal".
"""
def __init__(self,
transforms,
img_scale=None,
scale_factor=None,
flip=False,
flip_direction='horizontal'):
self.transforms = Compose(transforms)
assert (img_scale is None) ^ (scale_factor is None), (
'Must have but only one variable can be set')
if img_scale is not None:
self.img_scale = img_scale if isinstance(img_scale,
list) else [img_scale]
self.scale_key = 'scale'
assert mmcv.is_list_of(self.img_scale, tuple)
else:
self.img_scale = scale_factor if isinstance(
scale_factor, list) else [scale_factor]
self.scale_key = 'scale_factor'
self.flip = flip
self.flip_direction = flip_direction if isinstance(
flip_direction, list) else [flip_direction]
assert mmcv.is_list_of(self.flip_direction, str)
if not self.flip and self.flip_direction != ['horizontal']:
warnings.warn(
'flip_direction has no effect when flip is set to False')
if (self.flip
and not any([t['type'] == 'RandomFlip' for t in transforms])):
warnings.warn(
'flip has no effect when RandomFlip is not in transforms')
def __call__(self, results):
"""Call function to apply test time augment transforms on results.
Args:
results (dict): Result dict contains the data to transform.
Returns:
dict[str: list]: The augmented data, where each value is wrapped
into a list.
"""
aug_data = []
flip_args = [(False, None)]
if self.flip:
flip_args += [(True, direction)
for direction in self.flip_direction]
for scale in self.img_scale:
for flip, direction in flip_args:
_results = results.copy()
_results[self.scale_key] = scale
_results['flip'] = flip
_results['flip_direction'] = direction
data = self.transforms(_results)
aug_data.append(data)
# list of dict to dict of list
aug_data_dict = {key: [] for key in aug_data[0]}
for data in aug_data:
for key, val in data.items():
aug_data_dict[key].append(val)
return aug_data_dict
def __repr__(self):
repr_str = self.__class__.__name__
repr_str += f'(transforms={self.transforms}, '
repr_str += f'img_scale={self.img_scale}, flip={self.flip}, '
repr_str += f'flip_direction={self.flip_direction})'
return repr_str
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