Abstract: For query auto completion (QAC) in an eCommerce platform with constantly changing product supply and demand, a Query Mover's Distance (QMD) framework for ranking queries is used, which formulates QAC as an optimal transport problem balancing product demand and supply.

Abstract: Implementations of this specification provide blockchain-based recording and querying methods and apparatuses. An example method includes operations performed by an access gateway, including receiving, from a first service system, user data including a user identifier of a user; transmitting, to an identifier hash system, a first hash request for the user identifier; receiving, from the identifier hash system, a hash digest of the user identifier; replacing the user identifier in the user data with the hash digest of the user identifier, and packaging the user data into a storage transaction; transmitting, to a blockchain, the storage transaction; receiving, from the blockchain, a result of the storage transaction having been performed by a smart contract published by the first service system on the blockchain; and providing, to the first service system, the result of the storage transaction.

Abstract: For query auto completion (QAC) in an eCommerce platform with constantly changing product supply and demand, a Query Mover's Distance (QMD) framework for ranking queries is used, which formulates QAC as an optimal transport problem balancing product demand and supply.

Abstract: Implementations of this specification provide blockchain-based recording and querying methods and apparatuses. An example method includes operations performed by an access gateway, including receiving, from a first service system, user data including a user identifier of a user; transmitting, to an identifier hash system, a first hash request for the user identifier; receiving, from the identifier hash system, a hash digest of the user identifier; replacing the user identifier in the user data with the hash digest of the user identifier, and packaging the user data into a storage transaction; transmitting, to a blockchain, the storage transaction; receiving, from the blockchain, a result of the storage transaction having been performed by a smart contract published by the first service system on the blockchain; and providing, to the first service system, the result of the storage transaction.

Abstract: An obtaining unit (120) obtains a ranking of a commercial product belonging to a category defined on an e-marketplace. A collecting unit (121) collects a term relevant to a commercial product at an upper position in the obtained ranking from a text contained in a sales page for selling the upper ranking position commercial product or a search query that triggers the sales page to be viewed. A calculating unit (122) calculates a score of each collected term based on at least a number of collections of the term. A presenting unit (123) presents, as a suggested keyword for search refinement of the commercial product belonging to the category, the term with the calculated score in an upper ranking position.

Abstract: An obtaining unit (120) obtains a ranking of a commercial product belonging to a category defined on an e-marketplace. A collecting unit (121) collects a term relevant to a commercial product at an upper position in the obtained ranking from a text contained in a sales page for selling the upper ranking position commercial product or a search query that triggers the sales page to be viewed. A calculating unit (122) calculates a score of each collected term based on at least a number of collections of the term. A presenting unit (123) presents, as a suggested keyword for search refinement of the commercial product belonging to the category, the term with the calculated score in an upper ranking position.