Retrieval Method, Index Construction Method, and Related Device

A retrieval apparatus, comprising:

• a memory configured to store instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to:
• obtain first data corresponding to a retrieval object, wherein the first data indicates M first feature vectors of the retrieval object, wherein each of the M first feature vectors corresponds to one first modality of the retrieval object, and wherein M is an integer greater than 1;
• and
• obtain, based on the first data and a first plurality of groups of second data in an index, a first correlation between a second plurality of groups of object information and the retrieval object;
• output, based on the first correlation, at least one group of retrieved object information,
• wherein a second correlation between each of the second plurality of groups and the retrieval object is greater than a first threshold,
• wherein each of the first plurality of groups corresponds to M second feature vectors,
• wherein the M second feature vectors are indicated by one of the first plurality of groups, and
• wherein each of the M second feature vectors corresponds to one second modality of the object information.

A computer program product comprising instructions stored on a non-transitory computer-readable medium that, when executed by a processor, cause a retrieval apparatus to:

• obtain first data corresponding to a retrieval object, wherein the first data indicates M first feature vectors of the retrieval object, wherein each of the M first feature vectors corresponds to one first modality of the retrieval object, and wherein M is an integer greater than 1;
• and
• obtain, based on the first data and a first plurality of groups of second data in an index, a first correlation between a second plurality of groups of object information and the retrieval object;
• obtain, based on the first correlation, at least one group of retrieved object information,
• wherein a second correlation between each of the second plurality of groups and the retrieval object is greater than a first threshold,
• wherein each of the first plurality of groups corresponds to M second feature vectors,
• wherein the M second feature vectors are indicated by one of the first plurality of groups, and
• wherein each of the M second feature vectors corresponds to one second modality of the object information.