Adaptive Masked Proxies for Few Shot Segmentation

Implementation used in our paper:

• Adaptive Masked Proxies for Few Shot Segmentation

• Extended Version: Accepted in ICCV'19 for the Extended version.

• Workshop Paper: Accepted in Learning from Limited Labelled Data Workshop in Conjunction with ICLR'19.

Description

Deep learning has thrived by training on large-scale datasets. However, for continual learning in applications such as robotics, it is critical to incrementally update its model in a sample efficient manner. We propose a novel method that constructs the new class weights from few labelled samples in the support set without back-propagation, relying on our adaptive masked proxies approach. It utilizes multi-resolution average pooling on the output embeddings masked with the label to act as a positive proxy for the new class, while fusing it with the previously learned class signatures. Our proposed method is evaluated on PASCAL-5i dataset and outperforms the state of the art in the 5-shot semantic segmentation. Unlike previous methods, our proposed approach does not require a second branch to estimate parameters or prototypes, which enables it to be used with 2-stream motion and appearance based segmentation networks. The proposed adaptive proxies allow the method to be used with a continuous data stream. Our online adaptation scheme is evaluated on the DAVIS and FBMS video object segmentation benchmark. We further propose a novel setup for evaluating continual learning of object segmentation which we name incremental PASCAL (iPASCAL) where our method has shown to outperform the baseline method.

Qualitative Evaluation on PASCAL-5i

1-way 1-shot segmentation

Qualitative Evaluation on LfW

2-way 1-shot segmentation

Environment setup

Current Code is tested on torch 0.4.1 and torchvision 0.2.0.

virtualenv --system-site-packages -p python3 ./venv
source venv/bin/activate
pip install -r requirements.txt

Pre-Trained Weights

Download trained weights here

Python Notebook Demo

To use with google Colab upload notebook with the following url Demo

Train on Large Scale Data

• Copy dataset/train_aug.txt to PASCALVOC_PATH/ImageSets/Segmentation/ to ensure no overlap between val and train data
• Run the following:

python train.py --config configs/fcn8s_pascal.yaml

Test few shot setting

python fewshot_imprinted.py --binary BINARY_FLAG --config configs/fcn8s_pascal_imprinted.yml --model_path MODEL_PATH --out_dir OUT_DIR --iterations_imp ITER_IMP

• MODEL_PATH: path for model trained on same fold testing upon.
• OUT_DIR: output directory to save visualization if needed. (optional)
• BINARY_FLAG: 0: evaluates on 17 classes (15 classes previously trained+Bg+New class), 1: evaluate binary with OSLSM method, 2: evaluates binary using coFCN method.
• ITER_IMP: 0/1 FLAG for the iterative adaptation on the query image for further refinement, set to 1 for results reported throughout the paper.

Configuration

• arch: dilated_fcn8s | fcn8s | reduced_fcn8s
• lower_dim: True (uses 256 nchannels in last layer) | False (uses 4096)
• weighted_mask: True (uses weighted avg pooling based on distance transform)| False (uses mased avg pooling)
• use_norm: True (normalize embeddings during inference)| False
• use_norm_weights: True (normalize extracted embeddings) | False
• use_scale: False: True (Learn scalar hyperaparameter) | False
• dataset: pascal5i (few shot OSLSM setting)| pascal
• fold: 0 | 1 | 2 | 3
• k_shot: 1 | 5

Visualize predictions and support set

python vis_preds.py VIS_FOLDER

Guide to Reproducing Experiments in the paper

Check Experiments.md Results reported in the short version paper were using the Foregound IoU and the dataloader provided random pairs that weren't exactly same as the ones used by OSLSM. While the corrected results in the extended version reported using Foreground IoU per class and using the pairs generated by OSLSM code exactly.

To reproduce results using our dataloader instead of reading random pairs generated from OSLSM code check prev_results branch.

Related Repos:

• Based on semantic segmentation repo: SemSeg
• Pascal5i loader based on OSLSM repo loader: OSLSM

References

Please cite our paper if you find it useful in your research

@article{DBLP:journals/corr/abs-1902-11123,
  author    = {Mennatullah Siam and
               Boris N. Oreshkin},
  title     = {Adaptive Masked Weight Imprinting for Few-Shot Segmentation},
  journal   = {CoRR},
  volume    = {abs/1902.11123},
  year      = {2019},
  url       = {http://arxiv.org/abs/1902.11123},
  archivePrefix = {arXiv},
  eprint    = {1902.11123},
  timestamp = {Tue, 21 May 2019 18:03:37 +0200},
  biburl    = {https://dblp.org/rec/bib/journals/corr/abs-1902-11123},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}