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This repo contains code to convert Structured Documents to Graphs and implement a Graph Convolution Neural Network (incomplete) for Node Classification, each node being an entity in the document.

Check out the article for an intuitive explanation on Towards Data Science:Using Graph Convolutional Neural Networks on Structured Documents for Information Extraction

Thegrapher.py file contains the code to convert a structured document to a graph.
An object map made using a Commercial OCR Tool is needed as the input which provides the bounding-box coordinates of each entity in the image along with it's recognized text. The script can then be used to generate anobject_tree.png file and aconnections.csv file. The script joins each object to it's nearest object to the right and underneath thus generating a graph.
Here is what the generated graph looks like:

The implementation is still in progress and is being built using Tensorflow 1.8. The implementation details can be found in [1].

1. Riba, Dutta et al - Table Detection in Invoice Documents by Graph Neural Networks -Link
2. Adam W. Harley, Alex Ufkes, and Konstantinos G. Derpanis - Department of Computer Science, Ryerson University, Toronto, Ontario - Evaluation of Deep Convolutional Nets for Document Image Classification and Retrieval -Link
3. Victor Garcia, Joan Bruna - Few-Shot Learning with Graph Neural Networks -Link