Struct GraphParams 

pub struct GraphParams {
    pub l_build: usize,
    pub alpha: f32,
    pub backedge_ratio: f32,
    pub vector_dtype: VectorDtype,
}

Graph configuration parameters persisted alongside the index. These are needed to reconstruct the DiskANNIndex config on load.

Fields

l_build: usize

l_build is the search list size used during index construction. When inserting a new vector into the DiskANN graph, the algorithm performs a greedy search to find the best neighbors to connect to. l_build controls how many candidate nodes are tracked during that search.

alpha: f32

alpha is the pruning aggressiveness parameter used during graph construction. During pruning, when deciding whether to keep a candidate neighbor k for node i, the algorithm checks if there’s already a closer neighbor j that “occludes” k. The occlusion test is is governed by alpha.

backedge_ratio: f32

backedge_ratio controls how many reverse (back) edges are added after pruning during graph construction.

vector_dtype: VectorDtype

vector_dtype indicates the data type of the vectors stored in the index, which is necessary for correctly interpreting the raw bytes of the vectors when loading the index from disk.

Trait Implementations

impl Clone for GraphParams

fn clone(&self) -> GraphParams

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GraphParams

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for GraphParams

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for GraphParams

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.