A data augmentation library for Deep Learning that supports images, segmentation masks, labels, and keypoints. Furthermore, SOLT is fast and has OpenCV in its backend. Full auto-generated docs and examples are available at https://oulu-imeds.github.io/solt/.

• Support of Images, masks, and keypoints for all the transforms (including multiple items at the time)
• Fast and PyTorch-integrated
• Convenient and flexible serialization API
• Excellent documentation
• Easy to extend
• 100% Code coverage

Images: Images Keypoints: Medical Images Binary Masks: Medical Images Multiclass Masks

E.g. the last row is generated using the following transforms stream.

stream = solt.Stream([
    slt.Rotate(angle_range=(-20, 20), p=1, padding='r'),
    slt.Crop((256, 256)),
    solt.SelectiveStream([
        slt.GammaCorrection(gamma_range=0.5, p=1),
        slt.Noise(gain_range=0.1, p=1),
        slt.Blur()    
    ], n=3)
])

img_aug, mask_aug = stream({'image': img, 'mask': mask})

If you want to visualize the results, you need to modify the execution of the transforms:

img_aug, mask_aug = stream({'image': img, 'mask': mask}, return_torch=False).data

The most recent version is available in pip:

pip install solt

You can fetch the most fresh changes from this repository:

pip install git https://github.com/MIPT-Oulu/solt

We propose a fair benchmark based on the refactored version of the one proposed by albumentations team. Still, here, we also convert the results into a PyTorch tensor and do the ImageNet normalization. The following numbers support a realistic and honest comparison between the libraries (number of images per second, the higher - the better):

Python and library versions: Python 3.7.0 (default, Oct 9 2018, 10:31:47) [GCC 7.3.0], numpy 1.18.1, pillow-simd 7.0.0.post3, opencv-python 4.2.0.32, scikit-image 0.16.2, scipy 1.4.1.

The code was run on AMD Threadripper 1900. Please find the details about the benchmark here.

Follow the guidelines described here.

Aleksei Tiulpin, Research Unit of Health Sciences and Technology Faculty of Medicine University of Oulu, Finland.

If you use SOLT and cite it in your research, please, don't hesitate to send an email to Aleksei Tiulpin. All the papers that use SOLT are listed here.

@misc{solt2019,
  author       = {Aleksei Tiulpin},
  title        = {SOLT: Streaming over Lightweight Transformations},
  month        = jul,
  year         = 2019,
  version      = {v0.1.9},
  doi          = {10.5281/zenodo.3702819},
  url          = {https://doi.org/10.5281/zenodo.3702819}
}