Module storage 

Storage backends for DiskANN

Provides abstractions for storing vectors and graph structures on disk with support for memory-mapped I/O and buffered access.

Storage Layout

• Vectors: Raw f32 arrays or PQ-compressed codes
• Graph: Adjacency lists with neighbor IDs
• Metadata: Index configuration and statistics

Backends

• DiskStorage: Standard file I/O with buffering
• MemoryMappedStorage: Memory-mapped files for fast access
• CachedStorage: Hybrid with LRU caching

Structs

DiskStorage

Standard disk storage with buffered I/O

MemoryMappedStorage

Memory-mapped storage (stub for future implementation)

StorageMetadata

Storage metadata

Traits

StorageBackend

Storage backend trait