Software Architecture

Figure 1 shows the software architecture of Index SDK. Table 1 describes the key modules in the architecture.

Figure 1 Software architecture

**Table 1** Index SDK modules
Module	Description
Index SDK API layer	Provides C++ APIs compatible with Faiss. Upper-layer applications can add, query, delete, and train features.
Algorithm logic layer	Implements the logic process of retrieval algorithms, including brute-force retrieval, approximate retrieval, and attribute filtering algorithms.
Operator layer	Includes acceleration operators of retrieval algorithms executed on the Ascend platform, including distance calculation operators, top-K sorting operator, and mask attribute filtering operator.