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redis-vl-dotnet

Cohere Reranker

RedisVL.Rerankers.Cohere provides CohereTextReranker, an ITextReranker implementation backed by Cohere’s rerank API.

Package contents

  • CohereTextReranker for remote reranking requests

  • CohereRerankerOptions for request shaping and endpoint selection

  • CohereRerankerPackage as the package marker type

Request options

CohereRerankerOptions currently supports:

  • MaxTokensPerDocument to cap per-document token usage

  • Priority to set the provider request priority

  • ClientName to send an X-Client-Name header

  • EndpointOverride when the application needs a non-default rerank endpoint

The default provider endpoint is https://api.cohere.com/v2/rerank.

Required environment variables

The runnable sample reads:

  • COHERE_API_KEY as the required provider credential

  • COHERE_RERANK_MODEL as an optional model override

  • REDIS_VL_REDIS_URL as the Redis connection string override

If COHERE_API_KEY is missing, /examples/CohereRerankerExample throws an InvalidOperationException before it attempts the provider request.

Example workflow

/examples/CohereRerankerExample shows the expected integration pattern:

  • load a Redis index with candidate documents

  • collect an initial candidate set through TextQuery

  • build RerankDocument values from those Redis hits

  • rerank the candidates with CohereTextReranker

  • print both the Redis order and the reranked provider order

Run it from the repository root:

dotnet run --project examples/CohereRerankerExample/CohereRerankerExample.csproj

Validation references

  • tests/RedisVL.Tests/Rerankers/CohereTextRerankerTests.cs covers request construction and response validation

  • tests/RedisVL.Tests/Rerankers/CohereTextRerankerSmokeTests.cs is the live-provider smoke test gate