EfficientUnet-PyTorch

A PyTorch 1.0 Implementation of Unet with EfficientNet as encoder

Useful notes

1. Due to some rounding problem in the decoder path (not a bug, this is a feature 😏), the input shape should be divisible by 32.
   e.g. 224x224 is a suitable size for input images, but 225x225 is not.

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Requirements

1. Python >= 3.6
2. PyTorch >= 1.0.0

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Installation

Install efficientunet-pytorch:

pip install efficientunet-pytorch

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Usage

1. EfficientNets

e.g. say you want a pretrained efficientnet-b5 model with 5 classes:

from efficientunet import *

model = EfficientNet.from_name('efficientnet-b5', n_classes=5, pretrained=True)

If you prefer to use a model with a custom head rather than just a simple change of the output_channels of the last fully-connected layer, use:

from efficientunet import *

model = EfficientNet.custom_head('efficientnet-b5', n_classes=5, pretrained=True)

The structure of model with custom head:
encoder -> concatenation of [AvgPool2d, MaxPool2d] -> Flatten -> Dropout -> Linear(512) -> ReLU -> Dropout -> Linear(n_classes)

2. EfficientUnets

e.g. say you want a pretrained efficientunet-b0 model with 2 output channels:

from efficientunet import *

b0unet = get_efficientunet_b0(out_channels=2, concat_input=True, pretrained=True)

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Acknowledgment

The pretrained weights are directly borrowed from this repo.