Neural Graph Collaborative Filtering

This is our Tensorflow implementation for the paper:

Xiang Wang, Xiangnan He, Meng Wang, Fuli Feng, and Tat-Seng Chua (2019). Neural Graph Collaborative Filtering. In SIGIR'19, Paris, France, July 21-25, 2019.

Author: Dr. Xiang Wang (xiangwang at u.nus.edu)

Introduction

Neural Graph Collaborative Filtering (NGCF) is a new recommendation framework based on graph neural network, explicitly encoding the collaborative signal in the form of high-order connectivities in user-item bipartite graph by performing embedding propagation.

Citation

If you want to use our codes in your research, please cite:

@inproceedings{NGCF19,
  author    = {Xiang Wang and
               Xiangnan He and
               Meng Wang and
               Fuli Feng and
               Tat-Seng Chua},
  title     = {Neural Graph Collaborative Filtering},
  booktitle = {{SIGIR}},
  year      = {2019}
}

Environment Requirement

The code has been tested running under Python 3.6.5. The required packages are as follows:

tensorflow == 1.8.0
numpy == 1.14.3
scipy == 1.1.0
sklearn == 0.19.1

Example to Run the Codes

The instruction of commands has been clearly stated in the codes (see the parser function in NGCF/utility/parser.py).

Gowalla dataset

python NGCF.py --dataset gowalla --regs [1e-5] --embed_size 64 --layer_size [64,64,64] --lr 0.0001 --save_flag 1 --pretrain 0 --batch_size 1024 --epoch 400 --verbose 1 --node_dropout [0.1] --mess_dropout [0.1,0.1,0.1]

Amazon-book dataset

python NGCF.py --dataset amazon-book --regs [1e-5] --embed_size 64 --layer_size [64,64,64] --lr 0.0005 --save_flag 1 --pretrain 0 --batch_size 1024 --epoch 200 --verbose 50 --node_dropout [0.1] --mess_dropout [0.1,0.1,0.1]

Some important arguments:

alg_type
- It specifies the type of graph convolutional layer.
- Here we provide three options:
  - ngcf (by default), proposed in Neural Graph Collaborative Filtering, SIGIR2019. Usage: --alg_type ngcf.
  - gcn, proposed in Semi-Supervised Classification with Graph Convolutional Networks, ICLR2018. Usage: --alg_type gcn.
  - gcmc, propsed in Graph Convolutional Matrix Completion, KDD2018. Usage: --alg_type gcmc.
adj_type
- It specifies the type of laplacian matrix where each entry defines the decay factor between two connected nodes.
- Here we provide four options:
  - ngcf (by default), where each decay factor between two connected nodes is set as 1(out degree of the node), while each node is also assigned with 1 for self-connections. Usage: --adj_type ngcf.
  - plain, where each decay factor between two connected nodes is set as 1. No self-connections are considered. Usage: --adj_type plain.
  - norm, where each decay factor bewteen two connected nodes is set as 1/(out degree of the node + self-conncetion). Usage: --adj_type norm.
  - gcmc, where each decay factor between two connected nodes is set as 1/(out degree of the node). No self-connections are considered. Usage: --adj_type gcmc.
node_dropout
- It indicates the node dropout ratio, which randomly blocks a particular node and discard all its outgoing messages. Usage: --node_dropout [0.1] --node_dropout_flag 1
- Note that the arguement node_dropout_flag also needs to be set as 1, since the node dropout could lead to higher computational cost compared to message dropout.
mess_dropout
- It indicates the message dropout ratio, which randomly drops out the outgoing messages. Usage --mess_dropout [0.1,0.1,0.1].

Dataset

We provide two processed datasets: Gowalla and Amazon-book.

train.txt
- Train file.
- Each line is a user with her/his positive interactions with items: userID\t a list of itemID\n.
test.txt
- Test file (positive instances).
- Each line is a user with her/his positive interactions with items: userID\t a list of itemID\n.
- Note that here we treat all unobserved interactions as the negative instances when reporting performance.
user_list.txt
- User file.
- Each line is a triplet (org_id, remap_id) for one user, where org_id and remap_id represent the ID of the user in the original and our datasets, respectively.
item_list.txt
- Item file.
- Each line is a triplet (org_id, remap_id) for one item, where org_id and remap_id represent the ID of the item in the original and our datasets, respectively.

nguyenvo09/neural_graph_collaborative_filtering