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Official PyTorch implementation of "Railroad is not a Train: Saliency as Pseudo-pixel Supervision for Weakly Supervised Semantic Segmentation", CVPR2021

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PWC PWC PWC

Railroad is not a Train: Saliency as Pseudo-pxiel Supervision for Weakly Supervised Semantic Segmentation (CVPR 2021)

CVPR 2021 paper

Seungho Lee1,* , Minhyun Lee1,*, Jongwuk Lee2, Hyunjung Shim1

* indicates an equal contribution

1 School of Integrated Technology, Yonsei University
2 Department of Computer Science of Engineering, Sungkyunkwan University

Introduction

EPS Existing studies in weakly-supervised semantic segmentation (WSSS) using image-level weak supervision have several limitations: sparse object coverage, inaccurate object boundaries, and co-occurring pixels from non-target objects. To overcome these challenges, we propose a novel framework, namely Explicit Pseudo-pixel Supervision (EPS), which learns from pixel-level feedback by combining two weak supervisions; the image-level label provides the object identity via the localization map and the saliency map from the off-the-shelf saliency detection model offers rich boundaries. We devise a joint training strategy to fully utilize the complementary relationship between both information. Our method can obtain accurate object boundaries and discard co-occurring pixels, thereby significantly improving the quality of pseudo-masks.

Updates

12 Jul, 2021: Initial upload

19 Aug, 2021: Minor update on information about dCRF and the pre-trained model of the segmentation networks

28 Aug, 2021: Major updates about MS-COCO 2014 dataset and minor updates (cleanup)

15 Apr, 2022: Minor update on information about the method setting up 'cls_labels.npy' the for ms-coco 17 dataset

  • Please see the issue: coco17

22 Feb, 2023: Minor update on the download link for coco dataset (Masks, Saliency maps)

Installation

  • Python 3.6
  • Pytorch >= 1.0.0
  • Torchvision >= 0.2.2
  • MXNet
  • Pillow
  • opencv-python (opencv for Python)

Execution

Dataset & pretrained model

Classification network

  • Execute the bash file for training, inference and evaluation.

    # Please see these files for the detail of execution.
    
    # PASCAL VOC 2012 
    # Baseline
    bash script/vo12_cls.sh
    # EPS
    bash script/voc12_eps.sh
    
    # MS-COCO 2014
    # Baseline
    bash script/coco_cls.sh
    # EPS
    bash script/coco_eps.sh  
  • We provide checkpoints, training logs, and performances for each method and each dataset.

    Please see the details from the script files.

    Dataset METHOD Train(mIoU) Checkpoint Training log
    PASCAL VOC 2012 Base 47.05 Download voc12_cls.log
    PASCAL VOC 2012 EPS 69.22 Download voc12_eps.log
    MS-COCO 2014 Base 31.23 Download coco_cls.log
    MS-COCO 2014 EPS 37.15 Download coco_eps.log
  • dCRF hyper-parameters

    • We did not use dCRF for our pseudo-masks, but only used for the comparision in the paper.
    • We chose the hyper-parameters for dCRF used in ResNet101-based DeepLabV2 among other candidates(OAA, and PSA)
    • Please see the official deeplab website for information
    CRF parameters: bi_w = 4, bi_xy_std = 67, bi_rgb_std = 3, pos_w = 3, pos_xy_std = 1.
    

Segmentation network

Results

results

Acknowledgement

This code is highly borrowed from PSA. Thanks to Jiwoon, Ahn.

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Official PyTorch implementation of "Railroad is not a Train: Saliency as Pseudo-pixel Supervision for Weakly Supervised Semantic Segmentation", CVPR2021

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