PCA-LGM

This repository is based on ThinkMatch (branch pca-gm-archive). As we all know, PCA-GM input two attribute graphs into the network, where the graphs are constructed by Delaunay trigulation or other methods. While PCA-LGM can update the graph structures automatically. This is the main contribution of this repo.

Before Training

Run this code in docker.

1. Clone this repository
2. Install docker
3. Pull Image of pytorch1.2
   docker pull siaimes/pytorch1.2:v1.0.1
4. Show docker image id
   docker images
5. Run docker
   docker run -it -v dir_to_PCA_LGM:/home/workdir --gpus all --shm-size 32G IMAGE_ID /bin/bash

Training and Evaluation Steps(By ThinkLab)

More information can be found in ThinkMatch

Preprocessing steps on Pascal VOC Keypoint dataset:

Here we describe our preprocessing steps on Pascal VOC Keypoint dataset for fair comparison and to ease future research.

1. Filter out instances with label 'difficult', 'occluded' and 'truncated', together with 'people' after 2008.
2. Randomly select two instances from the same category.
3. Crop these two instances from the background images using bounding box annotation.
4. Filter out non-overlapping keypoints (i.e. outliers) in two instances respectively and leave only inliers. If the resulting inlier number is less than 3, omit it (because the problem is too trivial).
5. Build graph structures from keypoint positions for two graphs independently (in PCA-GM, it is Delaunay triangulation).

Get started

1. Install and configure pytorch 1.1+ (with GPU support)
2. Install ninja-build: apt-get install ninja-build
3. Install python packages: pip install tensorboardX scipy easydict pyyaml
4. If you want to run experiment on Pascal VOC Keypoint dataset:
   1. Download VOC2011 dataset and make sure it looks like data/PascalVOC/VOC2011
   2. Download keypoint annotation for VOC2011 from Berkeley server or google drive and make sure it looks like data/PascalVOC/annotations
   3. The train/test split is available in data/PascalVOC/voc2011_pairs.npz
5. If you want to run experiment on Willow ObjectClass dataset, please refer to this section

Training

Run training and evaluation

python train_eval.py --cfg path/to/your/yaml

and replace path/to/your/yaml by path to your configuration file. Default configuration files are stored inexperiments/.

Evaluation

Run evaluation on epoch k

python eval.py --cfg path/to/your/yaml --epoch k

Detailed instructions on Willow Object Class dataset

1. Download Willow ObjectClass dataset
2. Unzip the dataset and make sure it looks like data/WILLOW-ObjectClass
3. If you want to initialize model weights on Pascal VOC Keypoint dataset (as reported in the paper), please:
   1. Remove cached VOC index rm data/cache/voc_db_*
   2. Uncomment L156-159 in data/pascal_voc.py to filter out overlapping images in Pascal VOC
   3. Train model on Pascal VOC Keypoint dataset, e.g. python train_eval.py --cfg experiments/vgg16_pca_voc.yaml
   4. Copy Pascal VOC's cached weight to the corresponding directory of Willow. E.g. copy Pascal VOC's model weight at epoch 10 for willow

   cp output/vgg16_pca_voc/params/*_0010.pt output/vgg16_pca_willow/params/

   1. Set the START_EPOCH parameter to load the pretrained weights, e.g. in experiments/vgg16_pca_willow.yaml set

   TRAIN:
      START_EPOCH: 10

Benchmark

Pascal VOC Keypoint (mean accuracy is on the last column)

method	aero	bike	bird	boat	bottle	bus	car	cat	chair	cow	table	dog	horse	mbike	person	plant	sheep	sofa	train	tv	mean
GMN	31.9	47.2	51.9	40.8	68.7	72.2	53.6	52.8	34.6	48.6	72.3	47.7	54.8	51.0	38.6	75.1	49.5	45.0	83.0	86.3	55.3
PCA-GM	40.9	55.0	65.8	47.9	76.9	77.9	63.5	67.4	33.7	65.5	63.6	61.3	68.9	62.8	44.9	77.5	67.4	57.5	86.7	90.9	63.8
PCA-LGM	51.4	62.8	61.4	61.0	78.0	71.6	72.1	71.4	38.5	63.0	62.3	65.2	62.7	61.0	47.3	77.3	65.4	56.8	79.6	88.4	64.8

Willow Object Class

method	face	m-bike	car	duck	w-bottle
HARG-SSVM	91.2	44.4	58.4	55.2	66.6
GMN-VOC	98.1	65.0	72.9	74.3	70.5
GMN-Willow	99.3	71.4	74.3	82.8	76.7
PCA-GM-VOC	99.6	48.3	64.5	58.1	75.2
PCA-GM-Willow	99.5	77.6	84.9	83.2	85.9