README.md

WSDM Cup 2023 BERT Checkpoints:

• This repo contains the checkpoints of our competition in WSDM Cup 2023: Pre-training for Web Search and Unbiased Learning for Web Search.

Paper released

Please refer to our paper for details in this competition:

• Task1 Unbiased Learning to rank: Multi-Feature Integration for Perception-Dependent Examination-Bias Estimation
• Task2 Pretraining for web search: Pretraining De-Biased Language Model with Large-scale Click Logs for Document Ranking

Method Overview

• Pre-training BERT with MLM and CTR prediction loss (or multi-task CTR prediction loss).
• Finetuning BERT with pairwise ranking loss.
• Obtain prediction scores from different BERTs.
• Ensemble learning to combine BERT features and sparse features.

Details will be updated in the submission paper.

BERT features:

1) Model details: Checkpoints Download Here

Index	Model Flag	Method	Pretrain step	Finetune step	DCG on leaderboard
1	large_group2_wwm_from_unw4625K	M1	1700K	5130	11.96214
2	large_group2_wwm_from_unw4625K	M1	1700K	5130	NAN
3	base_group2_wwm	M2	2150K	5130	~11.32363
4	large_group2_wwm_from_unw4625K	M1	590K	5130	11.94845
5	large_group2_wwm_from_unw4625K	M1	1700K	4180	NAN
6	large_group2_mt_pretrain	M3	1940K	5130	NAN

2) Method details

Method	Model Layers	Details
M1	24	WWM & CTR prediction as pretraining tasks
M2	12	WWM & CTR prediction as pretraining tasks
M3	24	WWM & Multi-task CTR prediction as pretraining tasks

Contacts

• Xiangsheng Li: [email protected].
• Xiaoshu Chen: [email protected]