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Single-Stage Semantic Segmentation from Image Labels

This repository contains the original implementation of our paper:

Single-stage Semantic Segmentation from Image Labels
Nikita Araslanov and Stefan Roth
To appear at CVPR 2020. [arXiv preprint]

Contact: Nikita Araslanov

We attain competitive results by training a single network model
for segmentation in a self-supervised fashion using only
image-level annotations (one run of 20 epochs on Pascal VOC).


  1. Minimum requirements. This project was originally developed with Python 3.6, PyTorch 1.0 and CUDA 9.0. The training requires at least two Titan X GPUs (12Gb memory each).

  2. Setup your Python environment. Please, clone the repository and install the dependencies. We recommend using Anaconda 3 distribution:

    conda create -n <environment_name> --file requirements.txt
  3. Download and link to the dataset. We train our model on the original Pascal VOC 2012 augmented with the SBD data (10K images in total). Download the data from:

    Link to the data:

    ln -s <your_path_to_voc> <project>/data/voc
    ln -s <your_path_to_sbd> <project>/data/sbd

    Make sure that the first directory in data/voc is VOCdevkit; the first directory in data/sbd is benchmark_RELEASE.

  4. Download pre-trained models. Download the initial weights (pre-trained on ImageNet) for the backbones you are planning to use and place them into <project>/models/weights/.

    Backbone Initial Weights Comment
    WideResNet38 ilsvrc-cls_rna-a1_cls1000_ep-0001.pth (402M) Converted from mxnet
    VGG16 vgg16_20M.pth (79M) Converted from Caffe
    ResNet50 resnet50-19c8e357.pth PyTorch official
    ResNet101 resnet101-5d3b4d8f.pth PyTorch official

Training, Inference and Evaluation

The directory launch contains template bash scripts for training, inference and evaluation.

Training. For each run, you need to specify names of two variables, for example


Running bash ./launch/ will create a directory ./logs/pascal_voc/baselines/v01 with tensorboard events and will save snapshots into ./snapshots/pascal_voc/baselines/v01.

Inference. To generate final masks, please, use the script ./launch/ You will need to specify:

  • EXP and RUN_ID you used for training;
  • OUTPUT_DIR the path where to save the masks;
  • FILELIST specifies the file to the data split;
  • SNAPSHOT specifies the model suffix in the format e000Xs0.000. For example, e020Xs0.928;
  • (optionally) EXTRA_ARGS specify additional arguments to the inference script.

Evaluation. To compute IoU of the masks, please, run ./launch/ You will need to specify SAVE_DIR that contains the masks and FILELIST specifying the split for evaluation.

Pre-trained model

For testing, we provide our pre-trained WideResNet38 model:

Backbone Val Val (+ CRF) Link
WideResNet38 59.7 62.7 model_enc_e020Xs0.928.pth (527M)

The also release the masks predicted by this model:

Split IoU IoU (+ CRF) Link Comment
train-clean (VOC+SBD) 64.7 66.9 train_results_clean.tgz (2.9G) Reported IoU is for VOC
val-clean 63.4 65.3 val_results_clean.tgz (423M)
val 59.7 62.7 val_results.tgz (427M)
test 62.7 64.3 test_results.tgz (368M)

The suffix -clean means we used ground-truth image-level labels to remove masks of the categories not present in the image. These masks are commonly used as pseudo ground truth to train another segmentation model in fully supervised regime.


We thank PyTorch team, and Jiwoon Ahn for releasing his code that helped in the early stages of this project.


We hope that you find this work useful. If you would like to acknowledge us, please, use the following citation:

  title     = {Single-Stage Semantic Segmentation from Image Labels},
  author    = {Araslanov, Nikita and and Roth, Stefan},
  booktitle = {Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  year = {2020}


Single-Stage Semantic Segmentation from Image Labels (CVPR 2020)





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