find similar function

cn7.rs

async fn find_similar(
    State(model_ctx): State<Arc<(BertInferenceModel, Vec<String>)>>,
    Json(payload): Json<ReqPayload>,
) -> Json<ResPayload> {
    let (model, text_map) = &*model_ctx;
    let query_vector = model
        .infer_sentence_embedding(&payload.text)
        .expect("error infering sentence embedding");
    let results: Vec<(usize, f32)> = model
        .score_vector_similarity(
            query_vector,
            payload.num_results as usize,
        )
        .unwrap();

    let results: Vec<String> = results
        .into_iter()
        .map(|r| {
            let top_item_text = text_map.get(r.0).unwrap();
            format!(
                "Item:{} (index: {} score:{:?})",
                top_item_text, r.0, r.1
            )
        })
        .collect();

    Json(ResPayload { text: results })
}