vectorrvnn

We present a data-driven method for hierarchical grouping of paths in vector graphics.

Paths in a graphic have a natural hierarchical order. They combine to make up parts that we visually recognize (eg. a flower petal, a face, a bike). These parts combine with others to create a scene (eg. a woman cycling through a garden). We want to infer such an organization automatically from a given graphic.

This repository contains:

• Dataset of graphics with annotated hierarchical decompositions.
• Code for training and testing ReGroup.
• An application to simplify selection of parts in vector graphics.

Paper

Prerequisites

• Linux
• CUDA
• python3.6
• rust
• EGL
• usvg

Getting Started

Installation

• Clone this repository:

https://github.com/Vrroom/vectorrvnn.git
cd vectorrvnn

• Install vectorrvnn library:

python3 setup.py install --user

Hopefully, things go smoothly. If not, open an Issue!

Training

The main script for training is TripletInterface.py. It can be called with a bunch of options. These are enumerated on:

python3 vectorrvnn/TripletInterface.py -h 

The options we used for the results presented in the paper are:

python3 vectorrvnn/interfaces/TripletInterface.py \
    --frequency 50 \
    --dataroot ./data/All \
    --name expt-none1 \
    --backbone resnet18 \
    --modelcls ThreeBranch \
    --freeze_layers conv1 bn1 layer1 layer2 \
    --embedding_size 64 \
    --loss cosineSimilarity \
    --temperature 0.1 \
    --samplercls DiscriminativeSampler \
    --sim_criteria negativeCosineSimilarity \
    --n_epochs 28 \
    --hidden_size 128 128 \
    --lr 0.0002 \
    --batch_size 32 \
    --wd 0.00001 \
    --augmentation multiaug \
    --use_layer_norm true \
    --lr_policy step \
    --decay_start 7 \
    --phase train \
    --seed 0 \

Organization

• data - The dataset we collected. More information in ./data/README.md.
• notebooks - Jupyter Notebooks for testing and visualization.
  • Clip.ipynb - Pairing ReGroup with CLIP to make text based selection app.
  • MultiGraphic.ipynb - Visualizations for Multi-Graphic data augmentation strategy.
  • NodeOverlap.ipynb - Node Overlap metric discussed in Section 7 of the paper.
  • TreeEditDistances.ipynb - Visualizations of tree-to-tree matching.
• selection_app - Vector Graphic selection app powered by our method. More information in ./selection_app/README.md.
• tests - Tests for the vectorrvnn library. Can be run by python3 -m pytest --cov=vectorrvnn ./tests/.
• vectorrvnn - The main library for training, testing, visualizations, baselines etc.
  • baselines - Implementation of Suggero and Fisher et. al.
  • data - Custom data loaders, triplet samplers and data augmentation pipeline.
  • geometry - Methods for analysing bezier path geometry. These are used to implement the baselines.
  • interfaces - Torch-tools interface for training. It helps logging, visualizing on visdom, saving checkpoints etc.
  • networks - Definitions of neural network architectures. All of them inherit from TripletBase.py. This class defines various contrastive losses and the hierarchy inference procedure discussed in Section 5 of the paper.
  • trainutils - Utility functions for pytorch, callbacks, command line options, network initialization.
  • utils - Utility functions for manipulating XML DOM of SVG files, algebra on bounding boxes, visualizing hierarchies, computing tree edit distances, bipartite matching etc.