Modeling Global and Local Node Contexts for Text Generation from Knowledge Graphs

This repository contains the code for the TACL paper: "Modeling Global and Local Node Contexts for Text Generation from Knowledge Graphs".

This repository contains experimental software and is published for the sole purpose of giving additional background details on the respective publication.

This project is implemented using the framework OpenNMT-py and the library PyTorch Geometric. Please, refer to their websites for further details on the installation and dependencies.

Environments and Dependencies

• python 3.6
• PyTorch 1.1.0
• PyTorch Geometric 1.3.1
• torch-cluster - 1.4.4
• torch-scatter - 1.3.1
• torch-sparse - 0.4.0
• torch-spline-conv - 1.1.0
• subword-nmt 0.3.6

Datasets

In our experiments, we use the following datasets: AGENDA and WebNLG.

Preprocess

First, convert the dataset into the format required for the model.

For the AGENDA dataset, run:

./preprocess_AGENDA.sh <dataset_folder>

For the WebNLG dataset, run:

./preprocess_WEBNLG.sh <dataset_folder>

Training

For traning the model using the AGENDA dataset, execute:

./train_AGENDA.sh <gpu_id> <graph_encoder> 

For the WebNLG dataset, execute:

./train_WEBNLG.sh <gpu_id> <graph_encoder> 

Options for <graph_encoder> are pge, cge, pge-lw or cge-lw.

Examples:

./train_AGENDA.sh 0 pge 
./train_WEBNLG.sh 0 cge-lw

Decoding

For decoding, run:

./decode_AGENDA.sh <gpu_id> <model> <nodes_file> <graph_file> <output>
./decode_WEBNLG.sh <gpu_id> <model> <nodes_file> <graph_file> <output>

Example:

./decode_AGENDA.sh 0 model_agenda_cge_lw.pt test-nodes.txt test-graph.txt output-agenda-testset.txt

Trained models

• CGE-LW trained on AGENDA training set (download):

  • BLEU on AGENDA test set: 18.10, 58.8/29.5/16.4/9.0 (BP=0.804, ratio=0.821, hyp_len=114233, ref_len=139162) (output)

• CGE-LW trained on WEBNLG training set (download):

  • BLEU on WEBNLG seen test set: 63.68, 89.8/72.8/58.7/47.6 (BP=0.974, ratio=0.975, hyp_len=21984, ref_len=22554) (output)

More

For more details regading hyperparameters, please refer to OpenNMT-py and PyTorch Geometric.

Contact person: Leonardo Ribeiro, ribeiro@aiphes.tu-darmstadt.de

Citation

@article{doi:10.1162/tacl\_a\_00332,
author = {Ribeiro, Leonardo F. R. and Zhang, Yue and Gardent, Claire and Gurevych, Iryna},
title = {Modeling Global and Local Node Contexts for Text Generation from Knowledge Graphs},
journal = {Transactions of the Association for Computational Linguistics},
volume = {8},
number = {},
pages = {589-604},
year = {2020},
doi = {10.1162/tacl\_a\_00332},

URL = { 
        https://doi.org/10.1162/tacl_a_00332
    
},
eprint = { 
        https://doi.org/10.1162/tacl_a_00332
    
}
,
    abstract = { Recent graph-to-text models generate text from graph-based data using either global or local aggregation to learn node representations. Global node encoding allows explicit communication between two distant nodes, thereby neglecting graph topology as all nodes are directly connected. In contrast, local node encoding considers the relations between neighbor nodes capturing the graph structure, but it can fail to capture long-range relations. In this work, we gather both encoding strategies, proposing novel neural models that encode an input graph combining both global and local node contexts, in order to learn better contextualized node embeddings. In our experiments, we demonstrate that our approaches lead to significant improvements on two graph-to-text datasets achieving BLEU scores of 18.01 on the AGENDA dataset, and 63.69 on the WebNLG dataset for seen categories, outperforming state-of-the-art models by 3.7 and 3.1 points, respectively. }
}