Struct StaticHashBackend 

pub struct StaticHashBackend { /* private fields */ }

Fallback embedding backend — hashes the input bytes into a deterministic pseudo-embedding of the configured dimension.

Used when the BERT backend is unavailable (e.g. the bert feature is disabled or the HuggingFace Hub model cache cannot be reached). The output is not semantically meaningful — it just provides stable vectors for tests and offline development.

Trait Implementations

impl EmbeddingBackend for StaticHashBackend

fn embedding_dimension(&self) -> usize

Dimension of the produced embedding vectors.

fn is_bert_based(&self) -> bool

Whether this backend runs a BERT-style model. BERT backends are routed through the engine’s concurrency controller, timeout, and adaptive batching machinery; non-BERT backends are invoked directly.

fn process_batch<'life0, 'async_trait>( &'life0 self, texts: Vec<String>, ) -> Pin<Box<dyn Future<Output = Result<Vec<Vec<f32>>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Process a batch of texts and return one embedding vector per text. The engine slices large inputs into chunks no larger than the engine’s current_batch_size before calling this method.