Alibaba Group Holding Limited

Alipay (hangzhou) Information Technology Co., Ltd.

Qingkai Mao

Lei Wang

Yang Yang

Xinying Yang

Yu Ying Wang

Yang Zhao

Qunshan Huang

Zhou Ye

Fan Chen

Jian Du

Pu Duan

Nannan Du

Kefeng Yu

Mengyun Zhao

Benyu Zhang

Jun Qi

Shunde Cao

Implementations of this specification provide query optimization methods, apparatuses, and systems for secure multi-party databases. In an implementation, a method includes: receiving a current query associated with a plurality of target database of a multi-party database system, generating a plurality of execution plans for the current query, determining, for each execution plan, a respective cost computation formula of a plurality of cost computation values for computing an execution cost of jointly executing the execution plan by the plurality of target databases, receiving a secure computation result from each of a plurality of query engines corresponding to the plurality of target databases, and determining an optimal execution plan having a lowest cost value in the plurality of cost computation formulas based on the secure computation result.

Query optimization methods, apparatuses, and systems for secure multi-party database

In an implementation, operation instructions indicating application data to be used for performing one or more operations sent by a first client device are received. The application data is determined based on the operation instructions. One or more second client devices associated with the application data are determined. Operation codes in a trusted execution environment (TEE) associated with the application data to be executed are determined. That the operation codes has been executed for K times based on an indicator is determined. The operation codes are executed in the TEE based on the application data to generate an operation log. An indicator indicating a number of times the operation codes are executed is updated. The operation log and the indicator are sent as an operation record to a database server, the first client device, and the one or more second client devices to be stored.

Method, apparatus, and device for storing operation record based on trusted execution environment

The disclosure provides an information processing method and device. In one embodiment, an information processing method comprises receiving a request for generating questions inputted by a user, the request for generating questions includes a to-be-learned knowledge point; acquiring, from a knowledge graph for questions, a node path including a target node indicating the to-be-learned knowledge point, the nodes in the knowledge graph for questions indicating question-answering steps of existing questions, knowledge points tested in the question-answering steps, and questioning styles corresponding to the question-answering steps; and generating questions required by the user according to question-answering steps, knowledge points tested in the question-answering steps, and questioning styles corresponding to the question-answering steps indicated by nodes on the node path. The present disclosure enables generation of new questions and facilitates the expansion of a question bank.

Method and device for generating online question paths from existing question banks using a knowledge graph

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Hangzhou, China

Qingkai Mao