Reliable Label Bootstrapping for semi-supervised learning (2020): https://arxiv.org/abs/2007.11866

Official implementation.

How to run

Training on a dataset is sperated in 3 phases.

First phase (Can be skipped if you already have self-supervised or transfer learning weights for the label propagation)

Train a self-supervised algorithm on the dataset to learn good image descriptors, in the paper we use our own implementation of iMix coupled with N-pairs: (https://github.com/PaulAlbert31/iMix). You can alternatively use ImageNet weights (not studied in the paper) by using --load imagenet on main_subset.py. Only ResNet50 supports this feature at the time and results are worse than SSL training.

The weights can be downloaded from https://drive.google.com/drive/folders/1FlUid993oMge6ppdrTmFCK7UhboPi4-c?usp=sharing

Second phase

Reliable sample bootstrapping: Propagate the few labels using the previously learned image descriptors and select an extended pool of reliable samples. The bash file also include the semi-supervised training with a Pseudo-Labeling algorithm (https://github.com/EricArazo/PseudoLabeling), you will need to use pretrained RotNet weights with the Pseudo-Labeling algorithm to reach good performance. No self-supervised weights are necessary for ReMixMatch (see below).

$ cd ..
$ bash train_base.sh

Final phase

Semi-supervised training on the extended reliable subset, here with ReMixMatch (https://github.com/google-research/remixmatch). The code is in Tensorflow so you have to switch to the proper conda env (see Dependencies below).

$ cd remixmatch
$ conda deactivate
$ conda activate tf
$ bash run_RMM.sh

Dependencies (conda)

ReLaB and Pseudo-Labeling + SWA

$ conda env create -f environment.yml
$ conda activate relab
$ pip3 install torchcontrib
$ git clone https://github.com/pytorch/contrib.git                                                                                                                                                                                                                        
$ cd contrib
$ sudo python3 setup.py install
$ cd ..

ReMixMatch (tensorflow)

$ cd remixmatch
$ conda env create -f condatfenv.yml
$ conda activate tf

Some paper results, refer to arxiv for comparison numbers

These number are from our paper, runs with this cleaned up code can slightly differ, will update them in time...

Dataset	Labeled Samples	SSL accuracy PL	SSL accuracy RMM
CIFAR10	40	83.25	90.65
CIFAR10	100	88.59	92.22
CIFAR100	400	42.71	51.13
CIFAR100	1000	49.36	57.90
miniImageNet	400	30.75	-
miniImageNet	1000	37.82	-

Please cite our paper if it helps your research

@misc{albert2020relab,
    title={ReLaB: Reliable Label Bootstrapping for Semi-Supervised Learning},
    author={Paul Albert and Diego Ortego and Eric Arazo and Noel E. O'Connor and Kevin McGuinness},
    year={2020},
    eprint={2007.11866},
    archivePrefix={arXiv},
    primaryClass={cs.CV}
}