SemTorch 0.1.1

Deep Leaarning segmentation architectures for PyTorch and FastAI

SemTorch

This repository contains different deep learning architectures definitions that can be applied to image segmentation.

All the architectures are implemented in PyTorch and can been trained easily with FastAI 2.

In Deep-Tumour-Spheroid repository can be found and example of how to apply it with a custom dataset, in that case brain tumours images are used.

These architectures are classified as:

• Semantic Segmentation: each pixel of an image is linked to a class label.
• Instance Segmentation: is similar to semantic segmentation, but goes a bit deeper, it identifies , for each pixel, the object instance it belongs to.
• Salient Object Detection (Binary clases only): detection of the most noticeable/important object in an image.

🚀 Getting Started

To start using this package, install it using pip:

For example, for installing it in Ubuntu use:

pip3 install SemTorch

👩‍💻 Usage

This package creates an abstract API to access a segmentation model of different architectures. This method returns a FastAI 2 learner that can be combined with all the fastai's functionalities.

# SemTorch
from semtorch import get_segmentation_learner

learn = get_segmentation_learner(dls=dls, number_classes=2, segmentation_type="Semantic Segmentation",
                                 architecture_name="deeplabv3+", backbone_name="resnet50", 
                                 metrics=[tumour, Dice(), JaccardCoeff()],wd=1e-2,
                                 splitter=segmentron_splitter).to_fp16()

You can find a deeper example in Deep-Tumour-Spheroid repository, in this repo the package is used for the segmentation of brain tumours.

def get_segmentation_learner(dls, number_classes, segmentation_type, architecture_name, backbone_name,
                             loss_func=None, opt_func=Adam, lr=defaults.lr, splitter=trainable_params, 
                             cbs=None, pretrained=True, normalize=True, image_size=None, metrics=None, 
                             path=None, model_dir='models', wd=None, wd_bn_bias=False, train_bn=True,
                             moms=(0.95,0.85,0.95)):

This function return a learner for the provided architecture and backbone

Parameters:

• dls (DataLoader): the dataloader to use with the learner
• number_classes (int): the number of clases in the project. It should be >=2
• segmentation_type (str): just Semantic Segmentation accepted for now
• architecture_name (str): name of the architecture. The following ones are supported: unet, deeplabv3+, hrnet, maskrcnn and u2^net
• backbone_name (str): name of the backbone
• loss_func (): loss function.
• opt_func (): opt function.
• lr (): learning rates
• splitter (): splitter function for freazing the learner
• cbs (List[cb]): list of callbacks
• pretrained (bool): it defines if a trained backbone is needed
• normalize (bool): if normalization is applied
• image_size (int): REQUIRED for MaskRCNN. It indicates the desired size of the image.
• metrics (List[metric]): list of metrics
• path (): path parameter
• model_dir (str): the path in which save models
• wd (float): wieght decay
• wd_bn_bias (bool):
• train_bn (bool):
• moms (Tuple(float)): tuple of different momentuns

Returns:

• learner: value containing the learner object

Supported configs

Architecture	supported config	backbones
unet	Semantic Segmentation,binary Semantic Segmentation,multiple	resnet18, resnet34, resnet50, resnet101, resnet152, xresnet18, xresnet34, xresnet50, xresnet101, xresnet152, squeezenet1_0, squeezenet1_1, densenet121, densenet169, densenet201, densenet161, vgg11_bn, vgg13_bn, vgg16_bn, vgg19_bn, alexnet
deeplabv3+	Semantic Segmentation,binary Semantic Segmentation,multiple	resnet18, resnet34, resnet50, resnet101, resnet152, resnet50c, resnet101c, resnet152c, xception65, mobilenet_v2
hrnet	Semantic Segmentation,binary Semantic Segmentation,multiple	hrnet_w18_small_model_v1, hrnet_w18_small_model_v2, hrnet_w18, hrnet_w30, hrnet_w32, hrnet_w48
maskrcnn	Semantic Segmentation,binary	resnet50
u2^net	Semantic Segmentation,binary	small, normal

📩 Contact

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💼 Linkedin David Lacalle Castillo