ZhihuRec Dataset

Note: We cleaned and republished the dataset because we found some errors in the original dataset.

ZhihuRec dataset is constructed by the Information Retrieval group of Tsinghua Unversity (THUIR) and Zhihu company, and it is for research purposes only.

ZhihuRec dataset is collected from a knowledge-sharing platform (Zhihu), which is composed of around 100M interactions collected within 10 days, 798K users, 165K questions, 554K answers, 240K authors, 70K topics, and more than 501K user query logs. There are also descriptions of users, answers, questions, authors, and topics, which are anonymous. To the best of our knowledge, this is the largest real-world interaction dataset for personalized recommendation.

As the ZhihuRec dataset contains about 100M user-answer impression logs, it is also called ZhihuRec-100M. Two smaller datasets randomly sampled from ZhihuRec-100M dataset called ZhihuRec-20M and ZhihuRec-1M are also constructed to facilitate various application requirements. They contain about 20M and 1M user-answer impression logs and can be viewed as a medium-size dataset and a relatively small-size dataset.

Files in the dataset

Filename	Size	Description
inter_impression.csv	2.6GB	user clicks and impressions
inter_query.csv	111MB	user queries
info_user.csv	135MB	the features of the users occured in the dataset
info_answer.csv	917MB	the features of the answers occured in the dataset
info_question.csv	14MB	the features of the questions occured in the dataset
info_author.csv	3.1MB	the features of the authors occured in the dataset
info_topic.csv	413KB	the IDs of the topics occured in the dataset
info_token.csv	409MB	the features of the tokens occured in the dataset

Statistics of the dataset

Dataset	ZhihuRec-100M	ZhihuRec-20M	ZhihuRec-1M
#impressions *	99,978,523	19,999,857	999,970
#clicks	26,981,583	5,402,345	268,656
#clicks : #non-clicks	1 : 2.71	1 : 2.70	1 : 2.72
#queries *	3,899,553	776,201	38,422
#users *	798,086	159,642	7,974
avg #impressions per user	125.27	125.28	125.40
avg #clicks per user	33.81	33.84	33.69
#users with queries	501,893	100,271	5,047
avg #queries per user	7.77	7.74	7.61
#answers *	554,976	343,103	81,563
#questions *	165,012	104,130	29,340
#authors *	240,956	167,796	47,888
#topics *	72,318	54,785	22,897
#tokens *	556,546	428,334	249,586

* The two smaller datasets can be generated by taking the top $N$ lines in the eight files.

Fields in the dataset

Some fields in the data set are null, which are represented by empty strings in the file.

inter_impression.csv

Index	Nullable	Description
0		user ID
1		answer ID
2		impression timestamp
3		click timestamp (0 for non-click)

inter_query.csv

Index	Nullable	Description
0		user ID
1		token IDs in the query (separated by spaces)
2		query timestamp

info_user.csv

Index	Nullable	Description
0		user ID
1		register timestamp
2		gender
3		login frequency
4		#followers
5		#topics followed by this user
6		#questions followed by this user
7		#answers
8		#questions
9		#comments
10		#thanks received by this user
11		#comments received by this user
12		#likes received by this user
13		#dislikes received by this user
14		register type
15		register platform
16		from android or not
17		from iphone or not
18		from ipad or not
19		from pc or not
20		from mobile web or not
21		device model
22		device brand
23		platform
24		province
25		city
26	$\sqrt{}$	topic IDs followed by this user (separated by spaces)

info_answer.csv

Index	Nullable	Description
0		answer ID
1	$\sqrt{}$	question ID
2		anonymous or not
3	$\sqrt{}$	author ID (null for anonymous)
4		labeled high-value answer or not
5		recommended by the editor or not
6		create timestamp
7		contain pictures or not
8		contain videos or not
9		#thanks
10		#likes
11		#comments
12		#collections
13		#dislikes
14		#reports
15		#helpless
16	$\sqrt{}$	token IDs in the answer (separated by spaces)
17	$\sqrt{}$	topic IDs of the answer (separated by spaces)

info_question.csv

Index	Nullable	Description
0		question ID
1		create timestamp
2		#answers
3		#followers
4		#invitations
5		#comments
6	$\sqrt{}$	token IDs in the question (separated by spaces)
7	$\sqrt{}$	topic IDs of the queation (separated by spaces)

info_author.csv

Index	Nullable	Description
0		author ID
1		is excellent author or not
2		#followers
3		is excellent answerer or not

info_topic.csv

Index	Nullable	Description
0		topic ID

info_token.csv

Index	Nullable	Description
0		token ID *
1		word vector trained by word2vec (64 dimensions, separated by spaces)

* ZhihuRec can't provide the corresponding text of tokens for privacy reasons. Researchers can use word vectors in the dataset or train word vectors from scratch.

Citation

ZhihuRec dataset can be downloaded from here, and it is for the paper:

Bin Hao, Min Zhang, Weizhi Ma, Shaoyun Shi, Xinxing Yu, Houzhi Shan, Yiqun Liu and Shaoping Ma, 2021, A Large-Scale Rich Context Query and Recommendation Dataset in Online Knowledge-Sharing. arXiv preprint arXiv:2106.06467.

please cite the paper if you use this dataset:

@misc{hao2021largescale, title={A Large-Scale Rich Context Query and Recommendation Dataset in Online Knowledge-Sharing}, author={Bin Hao and Min Zhang and Weizhi Ma and Shaoyun Shi and Xinxing Yu and Houzhi Shan and Yiqun Liu and Shaoping Ma}, year={2021}, eprint={2106.06467}, archivePrefix={arXiv}, primaryClass={cs.IR} }

Contact

This dataset is for research use only. If you have any problem about this work or dataset, please contact with Bin Hao at haobin9527@qq.com.