Enum SparseHead 

#[non_exhaustive]
pub enum SparseHead {
    SpladeMlm,
    M3Linear,
    SpladeTied,
    MiniCoil,
    Bm42,
    Bm25,
}

Which sparse head a checkpoint runs; Bm25 has no encoder and loads through Bm25TextEmbedding alone.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

SpladeMlm

A masked-language-model head, max-pooled over the sequence: prithivida/Splade_PP_en_v1.

M3Linear

A Linear(hidden, 1) per position, scattered by token id: BAAI/bge-m3.

SpladeTied

SpladeMlm’s pooling over a Qwen3 backbone’s tied embedding table: naver/splade-code-06B.

MiniCoil

A per-word matrix over a private vocabulary, with a hash for unknown words: Qdrant/minicoil-v1.

Bm42

Last-layer attention summed per word and hashed: sentence-transformers/all-MiniLM-L6-v2.

Bm25

No encoder: the term-frequency half of BM25 per hashed stem, Qdrant/bm25.

Trait Implementations

impl Clone for SparseHead

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SparseHead

impl Debug for SparseHead

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SparseHead

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for SparseHead

impl PartialEq for SparseHead

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for SparseHead

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SparseHead