Offload rerank scoring and remove unused helper

[ljt019]

Summary

• avoid blocking async runtime in RerankPipeline::get_scores
• simplify Qwen3RerankModel construction by removing redundant rerank_id helper

Testing

• cargo test --lib
• cargo test --doc (fails: doctest compilation errors)

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https://chatgpt.com/codex/tasks/task_e_686cd099b6048330bee945114c47fab2

Summary by CodeRabbit

• Refactor

  • Simplified internal handling of model size identifiers for reranker models.
  • Improved performance and responsiveness of score calculation by offloading reranking tasks to a background thread.

• Bug Fixes

  • Enhanced error handling during asynchronous reranking operations to ensure robust error propagation.

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📥 Commits

Reviewing files that changed from the base of the PR and between 89eabe9 and 314ad9a.

📒 Files selected for processing (2)

• src/models/implementations/qwen3_reranker.rs (1 hunks)
• src/pipelines/reranker_pipeline/pipeline.rs (1 hunks)

Walkthrough

The changes refactor two components: the Qwen3 reranker model and the reranker pipeline. In the model, an unnecessary wrapper function was removed, simplifying the code. In the pipeline, the reranking process was offloaded to a blocking task using asynchronous execution, improving task management without altering public interfaces.

Changes

File(s)	Change Summary
src/models/implementations/qwen3_reranker.rs	Removed the private rerank_id function; updated Qwen3RerankModel::from_hf to call size.to_id() directly.
src/pipelines/reranker_pipeline/pipeline.rs	Modified get_scores to run reranking in a blocking task using tokio::task::spawn_blocking; internal refactor only.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant RerankerPipeline
    participant BlockingTask
    participant Model

    User->>RerankerPipeline: get_scores(query, documents)
    RerankerPipeline->>BlockingTask: spawn_blocking (move model, tokenizer, query, docs)
    BlockingTask->>Model: rerank(query, documents)
    Model-->>BlockingTask: scores
    BlockingTask-->>RerankerPipeline: scores (via JoinHandle)
    RerankerPipeline-->>User: scores

Loading

Poem

In the warren of code, we tidied a bit,
Out went a wrapper—no need to commit!
Reranking now runs in a task all its own,
Async and blocking, together they've grown.
With simpler flows and bouncier cheer,
The pipeline hops forward—release is near!
🐇✨

✨ Finishing Touches

• 📝 Generate Docstrings

---

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