Patta

Image Test Time Augmentation with Paddle2.0!

           Input
             |           # input batch of images 
        / / /|\ \ \      # apply augmentations (flips, rotation, scale, etc.)
       | | | | | | |     # pass augmented batches through model
       | | | | | | |     # reverse transformations for each batch of masks/labels
        \ \ \ / / /      # merge predictions (mean, max, gmean, etc.)
             |           # output batch of masks/labels
           Output

Table of Contents

1. Quick Start
2. Transforms
3. Aliases
4. Merge modes
5. Installation

Quick start (Default Transforms)

Test

We support that you can use the following to test after defining the network.

Segmentation model wrapping [docstring]:

import patta as tta
tta_model = tta.SegmentationTTAWrapper(model, tta.aliases.d4_transform(), merge_mode='mean')

Classification model wrapping [docstring]:

tta_model = tta.ClassificationTTAWrapper(model, tta.aliases.five_crop_transform())

Keypoints model wrapping [docstring]:

tta_model = tta.KeypointsTTAWrapper(model, tta.aliases.flip_transform(), scaled=True)

Note: the model must return keypoints in the format Tensor([x1, y1, ..., xn, yn])

Predict

We support that you can use the following to test when you have the predictive model: __model__、__params__.

Load model [docstring]:

import patta as tta
model = tta.load_model(path='model', model_filename='__model__', params_filename='__params__')

Segmentation model wrapping [docstring]:

tta_model = tta.SegmentationTTAWrapper(model, tta.aliases.d4_transform(), merge_mode='mean')

Classification model wrapping [docstring]:

tta_model = tta.ClassificationTTAWrapper(model, tta.aliases.five_crop_transform())

Keypoints model wrapping [docstring]:

tta_model = tta.KeypointsTTAWrapper(model, tta.aliases.flip_transform(), scaled=True)

Advanced Examples (DIY Transforms)

Custom transform:

# defined 2 * 2 * 3 * 3 = 36 augmentations !
transforms = tta.Compose(
    [
        tta.HorizontalFlip(),
        tta.Rotate90(angles=[0, 180]),
        tta.Scale(scales=[1, 2, 4]),
        tta.Multiply(factors=[0.9, 1, 1.1]),        
    ]
)

tta_model = tta.SegmentationTTAWrapper(model, transforms)

Custom model (multi-input / multi-output)

# Example how to process ONE batch on images with TTA
# Here `image`/`mask` are 4D tensors (B, C, H, W), `label` is 2D tensor (B, N)

for transformer in transforms: # custom transforms or e.g. tta.aliases.d4_transform() 
    
    # augment image
    augmented_image = transformer.augment_image(image)
    
    # pass to model
    model_output = model(augmented_image, another_input_data)
    
    # reverse augmentation for mask and label
    deaug_mask = transformer.deaugment_mask(model_output['mask'])
    deaug_label = transformer.deaugment_label(model_output['label'])
    
    # save results
    labels.append(deaug_mask)
    masks.append(deaug_label)
    
# reduce results as you want, e.g mean/max/min
label = mean(labels)
mask = mean(masks)

Optional Transforms

Transform	Parameters	Values
HorizontalFlip	-	-
VerticalFlip	-	-
Rotate90	angles	List[0, 90, 180, 270]
Scale	scales interpolation	List[float] "nearest"/"linear"
Resize	sizes original_size interpolation	List[Tuple[int, int]] Tuple[int,int] "nearest"/"linear"
Add	values	List[float]
Multiply	factors	List[float]
FiveCrops	crop_height crop_width	int int

Aliases (Combos)

• flip_transform (horizontal + vertical flips)
• hflip_transform (horizontal flip)
• d4_transform (flips + rotation 0, 90, 180, 270)
• multiscale_transform (scale transform, take scales as input parameter)
• five_crop_transform (corner crops + center crop)
• ten_crop_transform (five crops + five crops on horizontal flip)

Merge modes

• mean
• gmean (geometric mean)
• sum
• max
• min
• tsharpen (temperature sharpen with t=0.5)

Installation

PyPI:

# After downloading the whole dir
$ git clone https://github.com/AgentMaker/PaTTA.git
$ pip install PaTTA/

# or

$ pip install git+https://github.com/AgentMaker/PaTTA.git

Run tests

# run test_transforms.py and test_base.py for test
python test/test_transforms.py
python test/test_base.py