Cohere provides state-of-the-art reranking models that can significantly improve the relevance of search results. Cohere’s rerankers are optimized for various languages and use cases.

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Usage

To use Cohere’s reranker with Mem0: 
import os
from mem0 import Memory

os.environ["COHERE_API_KEY"] = "your-cohere-api-key"

config = {
    "reranker": {
        "provider": "cohere",
        "config": {
            "api_key": "your-cohere-api-key",  # Can also use environment variable
            "model": "rerank-english-v3.0",
            "top_n": 10
        }
    }
}

memory = Memory.from_config(config)

# Use memory as usual
memory.add("I love playing basketball", user_id="alice")
memory.add("I enjoy watching movies", user_id="alice")

# Search will now use Cohere reranking
results = memory.search("What sports does Alice like?", user_id="alice")

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Configuration

ParameterDescriptionDefault
api_keyCohere API keyRequired
modelCohere rerank modelrerank-english-v3.0
top_nNumber of results to return10

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Available Models

  • rerank-english-v3.0: Latest English reranking model
  • rerank-multilingual-v3.0: Multilingual reranking model
  • rerank-english-v2.0: Previous English model
  • rerank-multilingual-v2.0: Previous multilingual model

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Example with Different Models

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English Reranker

config = {
    "reranker": {
        "provider": "cohere",
        "config": {
            "api_key": "your-cohere-api-key",
            "model": "rerank-english-v3.0",
            "top_n": 5
        }
    }
}

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Multilingual Reranker

config = {
    "reranker": {
        "provider": "cohere",
        "config": {
            "api_key": "your-cohere-api-key",
            "model": "rerank-multilingual-v3.0",
            "top_n": 8
        }
    }
}

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Environment Variables

You can set your Cohere API key as an environment variable: 
export COHERE_API_KEY="your-cohere-api-key"
Then use the config without specifying the API key: 
config = {
    "reranker": {
        "provider": "cohere",
        "config": {
            "model": "rerank-english-v3.0",
            "top_n": 10
        }
    }
}

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Getting Your API Key

  1. Sign up at Cohere
  2. Navigate to the API keys section in your dashboard
  3. Generate a new API key
  4. Use this key in your configuration

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Performance Considerations

  • Cohere rerankers work best with 10-100 candidate documents
  • Higher top_n values provide more comprehensive reranking but may increase latency
  • The v3.0 models generally provide better performance than v2.0 models