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Image segmentation models with pre-trained backbones with Keras.

Project description

PyPI version

Segmentation models Zoo

Segmentation models with pretrained backbones

Avaliable models:

Avaliable backbones:

Backbone model Name Weights
VGG16 vgg16 imagenet
VGG19 vgg19 imagenet
ResNet18 resnet18 imagenet
ResNet34 resnet34 imagenet
ResNet50 resnet50 imagenet
ResNet101 resnet101 imagenet
ResNet152 resnet152 imagenet
ResNeXt50 resnext50 imagenet
ResNeXt101 resnext101 imagenet
DenseNet121 densenet121 imagenet
DenseNet169 densenet169 imagenet
DenseNet201 densenet201 imagenet
Inception V3 inceptionv3 imagenet
Inception ResNet V2 inceptionresnetv2 imagenet


  1. Python 3.6 or higher
  2. Keras >=2.1.0
  3. Tensorflow >= 1.4


Installing via pip

$ pip install segmentation_models

Using latest version in your project

$ git clone
$ cd segmentation_models
$ git submodule update --init --recursive

Code examples

Train Unet model:

from segmentation_models import Unet
from segmentation_models.backbones import get_preprocessing

# prepare data
x, y = ...

preprocessing_fn = get_preprocessing('resnet34')
x = preprocessing_fn(x)

# prepare model
model = Unet(backbone_name='resnet34', encoder_weights='imagenet')
model.compile('Adam', 'binary_crossentropy', ['binary_accuracy'])

# train model, y)

Train FPN model:

from segmentation_models import FPN

model = FPN(backbone_name='resnet34', encoder_weights='imagenet')

Useful trick

Freeze encoder weights for fine-tuning during first epochs of training:

from segmentation_models import FPN
from segmentation_models.utils import set_trainable

model = FPN(backbone_name='resnet34', encoder_weights='imagenet', freeze_encoder=True)
model.compile('Adam', 'binary_crossentropy', ['binary_accuracy'])

# pretrain model decoder, y, epochs=2)

# release all layers for training
set_trainable(model) # set all layers trainable and recompile model

# continue training, y, epochs=100)


  • Update Unet API
  • Update FPN API
  • Add Linknet models
  • Add PSP models
  • Add DPN backbones

Change Log

Version 0.1.2

Areas of improvement
  • Added PSPModel
  • Prepocessing functions for all backbones:
from segmentation_models import get_preprocessing

preprocessing_fn = get_preprocessing('resnet34')
X = preprocessing_fn(x)
API changes
  • Default param 'use_batchnorm=True` for all decoders
  • FPN model Upsample2D layer renamed to ResizeImage

Version 0.1.1

  • Added Linknet model
  • Keras 2.2+ compatibility (fixed import of _obtain_input_shape)
  • Small code improvements and bug fixes

Version 0.1.0

  • Unet and FPN models

Project details

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