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Generative Recommenders

Repository hosting code for Actions Speak Louder than Words: Trillion-Parameter Sequential Transducers for Generative Recommendations (https://arxiv.org/abs/2402.17152, to appear in ICML'24).

Currently only code for reproducing public experiments listed in the paper (Section 4.1.1) and Triton kernels for forward pass (Section 4.2) are included. We plan to add integration code and other kernels for HSTU needed for throughput/performance benchmarks at a later point in time.

Getting started

Public experiments

To reproduce the public experiments (traditional sequential recommender setting, Section 4.1.1) on MovieLens and Amazon Reviews in the paper, please follow these steps:

Install dependencies.

Install PyTorch based on official instructions. Then,

pip3 install gin-config absl-py scikit-learn scipy matplotlib numpy apex hypothesis pandas fbgemm_gpu iopath tensorboard

Download and preprocess data.

mkdir -p tmp/ && python3 preprocess_public_data.py

Run model training.

A GPU with 24GB or more HBM should work for most datasets.

CUDA_VISIBLE_DEVICES=0 python3 main.py --gin_config_file=configs/ml-1m/hstu-sampled-softmax-n128-large-final.gin --master_port=12345

Other configurations are included in configs/ml-1m, configs/ml-20m, and configs/amzn-books to make reproducing these experiments easier.

Verify results.

By default we write experimental logs to exps/. We can launch tensorboard with something like the following:

tensorboard --logdir ~/generative-recommenders/exps/ml-1m-l200/ --port 24001 --bind_all
tensorboard --logdir ~/generative-recommenders/exps/ml-20m-l200/ --port 24001 --bind_all
tensorboard --logdir ~/generative-recommenders/exps/amzn-books-l50/ --port 24001 --bind_all

With the provided configuration (.gin) files, you should be able to reproduce the following results (verified as of 04/15/2024):

MovieLens-1M (ML-1M):

Method HR@10 NDCG@10 HR@50 NDCG@50 HR@200 NDCG@200
SASRec 0.2853 0.1603 0.5474 0.2185 0.7528 0.2498
BERT4Rec 0.2843 (-0.4%) 0.1537 (-4.1%)
GRU4Rec 0.2811 (-1.5%) 0.1648 (+2.8%)
HSTU 0.3097 (+8.6%) 0.1720 (+7.3%) 0.5754 (+5.1%) 0.2307 (+5.6%) 0.7716 (+2.5%) 0.2606 (+4.3%)
HSTU-large 0.3294 (+15.5%) 0.1893 (+18.1%) 0.5935 (+8.4%) 0.2481 (+13.5%) 0.7839 (+4.1%) 0.2771 (+10.9%)

MovieLens-20M (ML-20M):

Method HR@10 NDCG@10 HR@50 NDCG@50 HR@200 NDCG@200
SASRec 0.2889 0.1621 0.5503 0.2199 0.7661 0.2527
BERT4Rec 0.2816 (-2.5%) 0.1703 (+5.1%)
GRU4Rec 0.2813 (-2.6%) 0.1730 (+6.7%)
HSTU 0.3273 (+13.3%) 0.1895 (+16.9%) 0.5889 (+7.0%) 0.2473 (+12.5%) 0.7952 (+3.8%) 0.2787 (+10.3%)
HSTU-large 0.3556 (+23.1%) 0.2098 (+29.4%) 0.6143 (+11.6%) 0.2671 (+21.5%) 0.8074 (+5.4%) 0.2965 (+17.4%)

Amazon Reviews (Books):

Method HR@10 NDCG@10 HR@50 NDCG@50 HR@200 NDCG@200
SASRec 0.0306 0.0164 0.0754 0.0260 0.1431 0.0362
HSTU 0.0416 (+36.4%) 0.0227 (+39.3%) 0.0957 (+27.1%) 0.0344 (+32.3%) 0.1735 (+21.3%) 0.0461 (+27.7%)
HSTU-large 0.0478 (+56.7%) 0.0262 (+60.7%) 0.1082 (+43.7%) 0.0393 (+51.2%) 0.1908 (+33.4%) 0.0517 (+43.2%)

for all three tables above, the SASRec rows are based on Self-Attentive Sequential Recommendation but with the original binary cross entropy loss replaced with sampled softmax losses proposed in Revisiting Neural Retrieval on Accelerators. These rows are reproducible with configs/*/sasrec-*-final.gin. The BERT4Rec and GRU4Rec rows are based on results reported by Turning Dross Into Gold Loss: is BERT4Rec really better than SASRec? - note that the comparison slightly favors these two, due to them using full negatives whereas the other rows used 128/512 sampled negatives. The HSTU and HSTU-large rows are based on Actions Speak Louder than Words: Trillion-Parameter Sequential Transducers for Generative Recommendations; in particular, HSTU rows utilize identical configurations as SASRec. HSTU and HSTU-large results can be reproduced with configs/*/hstu-*-final.gin.

Use synthetic dataset MovieLens-3B

We support generating synthetic dataset with fractal expansion introduced in https://arxiv.org/abs/1901.08910. This allows us to expand the current 20 million real-world ratings from ML-20M to 3 billion.

To download the pre-generated synthetic dataset:

pip3 install gdown
mkdir -p tmp/ && cd tmp/
gdown https://drive.google.com/uc?id=1-jZ6k0el7e7PyFnwqMLfqUTRh_Qdumt-
unzip ml-3b.zip && rm ml-3b.zip

To generate the synthetic dataset on your own:

python run_fractal_expansion.py --input-csv-file tmp/ml-20m/ratings.csv --write-dataset True --output-prefix tmp/ml-3b/

Efficiency experiments

ops/triton currently contains triton kernels needed for efficiency experiments (forward pass). More code (incl integration glue code) to be added at a later point in time. If it's urgent, please feel free to open PRs.

License

This codebase is Apache 2.0 licensed, as found in the LICENSE file.

Contributors

The overall project is made possible thanks to the joint work from many technical contributors (listed in alphabetical order):

Adnan Akhundov, Bugra Akyildiz, Shabab Ayub, Alex Bao, Renqin Cai, Jennifer Cao, Xuan Cao, Guoqiang Jerry Chen, Lei Chen, Sean Chen, Xianjie Chen, Huihui Cheng, Weiwei Chu, Ted Cui, Shiyan Deng, Nimit Desai, Fei Ding, Shilin Ding, Francois Fagan, Lu Fang, Leon Gao, Zhaojie Gong, Fangda Gu, Liang Guo, Liz Guo, Jeevan Gyawali, Yuchen Hao, Daisy Shi He, Michael Jiayuan He, Samuel Hsia, Jie Hua, Yanzun Huang, Hongyi Jia, Rui Jian, Jian Jin, Rahul Kindi, Changkyu Kim, Yejin Lee, Fu Li, Hong Li, Shen Li, Rui Li, Wei Li, Zhijing Li, Lucy Liao, Xueting Liao, Emma Lin, Hao Lin, Jingzhou Liu, Xing Liu, Xingyu Liu, Kai Londenberg, Yinghai Lu, Liang Luo, Linjian Ma, Matt Ma, Yun Mao, Bert Maher, Ajit Mathews, Matthew Murphy, Satish Nadathur, Min Ni, Jongsoo Park, Jing Qian, Lijing Qin, Alex Singh, Timothy Shi, Yu Shi, Dennis van der Staay, Xiao Sun, Colin Taylor, Shin-Yeh Tsai, Rohan Varma, Omkar Vichare, Alyssa Wang, Pengchao Wang, Shengzhi Wang, Wenting Wang, Xiaolong Wang, Yueming Wang, Zhiyong Wang, Wei Wei, Bin Wen, Carole-Jean Wu, Yanhong Wu, Eric Xu, Bi Xue, Hong Yan, Zheng Yan, Chao Yang, Junjie Yang, Wen-Yun Yang, Zimeng Yang, Chunxing Yin, Daniel Yin, Yiling You, Jiaqi Zhai, Keke Zhai, Yanli Zhao, Zhuoran Zhao, Hui Zhang, Jingjing Zhang, Lu Zhang, Lujia Zhang, Na Zhang, Rui Zhang, Xiong Zhang, Ying Zhang, Zhiyun Zhang, Charles Zheng, Erheng Zhong, Xin Zhuang.

For the initial paper describing the Generative Recommender problem formulation and the HSTU architecture, please refer to Actions Speak Louder than Words: Trillion-Parameter Sequential Transducers for Generative Recommendations (https://arxiv.org/abs/2402.17152, ICML'24), poster, slides (to be added). More documentations, including an extended technical report, will follow later.