PyTorch-ENet

PyTorch (v1.1.0) implementation of ENet: A Deep Neural Network Architecture for Real-Time Semantic Segmentation, ported from the lua-torch implementation ENet-training created by the authors.

This implementation has been tested on the CamVid and Cityscapes datasets. Currently, a pre-trained version of the model trained in CamVid and Cityscapes is available here.

Dataset	Classes 1	Input resolution	Batch size	Epochs	Mean IoU (%)	GPU memory (GiB)	Training time (hours)2
CamVid	11	480x360	10	300	52.13	4.2	1
Cityscapes	19	1024x512	4	300	59.54	5.4	20

¹ When referring to the number of classes, the void/unlabeled class is always excluded.
² These are just for reference. Implementation, datasets, and hardware changes can lead to very different results. Reference hardware: Nvidia GTX 1070 and an AMD Ryzen 5 3600 3.6GHz. You can also train for 100 epochs or so and get similar mean IoU (± 2%).
³ Test set.
⁴ Validation set.

Installation

Local pip

1. Python 3 and pip
2. Set up a virtual environment (optional, but recommended)
3. Install dependencies using pip: pip install -r requirements.txt

Docker image

1. Build the image: docker build -t enet .
2. Run: docker run -it --gpus all --ipc host enet

Usage

Run main.py, the main script file used for training and/or testing the model. The following options are supported:

python main.py [-h] [--mode {train,test,full}] [--resume]
               [--batch-size BATCH_SIZE] [--epochs EPOCHS]
               [--learning-rate LEARNING_RATE] [--lr-decay LR_DECAY]
               [--lr-decay-epochs LR_DECAY_EPOCHS]
               [--weight-decay WEIGHT_DECAY] [--dataset {camvid,cityscapes}]
               [--dataset-dir DATASET_DIR] [--height HEIGHT] [--width WIDTH]
               [--weighing {enet,mfb,none}] [--with-unlabeled]
               [--workers WORKERS] [--print-step] [--imshow-batch]
               [--device DEVICE] [--name NAME] [--save-dir SAVE_DIR]

For help on the optional arguments run: python main.py -h

Examples: Training

python main.py -m train --save-dir save/folder/ --name model_name --dataset name --dataset-dir path/root_directory/

Examples: Resuming training

python main.py -m train --resume True --save-dir save/folder/ --name model_name --dataset name --dataset-dir path/root_directory/

Examples: Testing

python main.py -m test --save-dir save/folder/ --name model_name --dataset name --dataset-dir path/root_directory/

Project structure

Folders

• data: Contains instructions on how to download the datasets and the code that handles data loading.
• metric: Evaluation-related metrics.
• models: ENet model definition.
• save: By default, main.py will save models in this folder. The pre-trained models can also be found here.

Files

• args.py: Contains all command-line options.
• main.py: Main script file used for training and/or testing the model.
• test.py: Defines the Test class which is responsible for testing the model.
• train.py: Defines the Train class which is responsible for training the model.
• transforms.py: Defines image transformations to convert an RGB image encoding classes to a torch.LongTensor and vice versa.