Abstract: A heliostat frame includes a primary beam and several secondary beams arranged on the primary beam at intervals. The secondary beams are fixed on the primary beam along an extending direction of a center axis of the primary beam, and the secondary beam is provided with several supporting block assemblies. The supporting block assembly includes supporting blocks and adhesive sheets. The supporting blocks are connected with a reflective surface of the heliostat through the adhesive sheets. A height of each of the supporting blocks is configured according to its position on the secondary beam, so that a line connected by centers of top surfaces of all of the supporting blocks on the secondary beam is arc-shaped. The heliostat frame reduces the requirements for the manufacturing accuracy of the secondary beam while guaranteeing surface accuracy of the heliostat, thereby effectively reducing the production costs and improving the manufacturing efficiency.

Abstract: The present disclosure discloses an information retrieval system evaluation method, device and storage medium. A ratio between the sum of all the related object parameters of a keyword in keyword in an evaluation retrieval result set and the sum of all the related object parameters of the keyword in keyword in a retrieval result set is used to compute a recall rate of an information retrieval system. And the recall rate is introduced to evaluate the information retrieval system, thereby enhancing accuracy of quantitative evaluation of the information retrieval system, and improving the automation degree of evaluation.

Abstract: A method and server for processing item identifiers, and a computer readable storage medium are disclosed. In one aspect, the method includes obtaining from a user device over a network, by a server, a commodity title input by the user through the user device and performing, by the server, word segmentation on the commodity title to obtain a keyword set comprising keywords comprised in the commodity title. The method also includes determining, by the server, a category path of the commodity title according to the keyword set and a preconfigured commodity category recognition model. The commodity category recognition model comprises correspondences between a plurality of keywords and a plurality of category paths and a counting value of the number of occurrences of each of the keywords under each corresponding category path.

Abstract: The present disclosure discloses an index constructing method, search method, device and system. The index constructing method includes: constructing data obtained in each preset time period into a primary index segment, respectively, and merging the constructed primary index segments into a primary index segment set after each preset time period is over; copying and merging each primary index segment in the primary index segment set into a corresponding large index segment, to obtain a large index segment set; and sending the primary index segments in the primary index segment set or the large index segments in the large index segment set to a search device to provide a search service. The present disclosure constructs the primary index segments on the basis of time, merges the constructed primary index segments into the large index segment, and provides the search service simultaneously with the primary index segments or the large index segments, thus, improving search speed.

Abstract: The present disclosure discloses an information retrieval system evaluation method, device and storage medium. A ratio between the sum of all the related object parameters of a keyword in keyword in an evaluation retrieval result set and the sum of all the related object parameters of the keyword in keyword in a retrieval result set is used to compute a recall rate of an information retrieval system. And the recall rate is introduced to evaluate the information retrieval system, thereby enhancing accuracy of quantitative evaluation of the information retrieval system, and improving the automation degree of evaluation.

Abstract: The present disclosure discloses an index constructing method, search method, device and system. The index constructing method includes: constructing data obtained in each preset time period into a primary index segment, respectively, and merging the constructed primary index segments into a primary index segment set after each preset time period is over; copying and merging each primary index segment in the primary index segment set into a corresponding large index segment, to obtain a large index segment set; and sending the primary index segments in the primary index segment set or the large index segments in the large index segment set to a search device to provide a search service. The present disclosure constructs the primary index segments on the basis of time, merges the constructed primary index segments into the large index segment, and provides the search service simultaneously with the primary index segments or the large index segments, thus, improving search speed.