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Tutorial: Using Cohere with Elasticsearch
editTutorial: Using Cohere with Elasticsearch
editThe instructions in this tutorial shows you how to compute embeddings with Cohere using the inference API and store them for efficient vector or hybrid search in Elasticsearch. This tutorial will use the Python Elasticsearch client to perform the operations.
You’ll learn how to:
- create an inference endpoint for text embedding using the Cohere service,
- create the necessary index mapping for the Elasticsearch index,
- build an inference pipeline to ingest documents into the index together with the embeddings,
- perform hybrid search on the data,
- rerank search results by using Cohere’s rerank model,
- design a RAG system with Cohere’s Chat API.
The tutorial uses the SciFact data set.
Refer to Cohere’s tutorial for an example using a different data set.
You can also review the Colab notebook version of this tutorial.
Requirements
edit- A paid Cohere account is required to use the Inference API with the Cohere service as the Cohere free trial API usage is limited,
- an Elastic Cloud account,
- Python 3.7 or higher.
Install required packages
editInstall Elasticsearch and Cohere:
!pip install elasticsearch !pip install cohere
Import the required packages:
from elasticsearch import Elasticsearch, helpers import cohere import json import requests
Create the Elasticsearch client
editTo create your Elasticsearch client, you need:
ELASTICSEARCH_ENDPOINT = "elastic_endpoint" ELASTIC_API_KEY = "elastic_api_key" client = Elasticsearch( cloud_id=ELASTICSEARCH_ENDPOINT, api_key=ELASTIC_API_KEY ) # Confirm the client has connected print(client.info())
Create the inference endpoint
editCreate the inference endpoint first. In this example, the
inference endpoint uses Cohere’s embed-english-v3.0
model and the
embedding_type
is set to byte
.
COHERE_API_KEY = "cohere_api_key" client.inference.put_model( task_type="text_embedding", inference_id="cohere_embeddings", body={ "service": "cohere", "service_settings": { "api_key": COHERE_API_KEY, "model_id": "embed-english-v3.0", "embedding_type": "byte" } }, )
You can find your API keys in your Cohere dashboard under the API keys section.
Create the index mapping
editCreate the index mapping for the index that will contain the embeddings.
client.indices.create( index="cohere-embeddings", settings={"index": {"default_pipeline": "cohere_embeddings"}}, mappings={ "properties": { "text_embedding": { "type": "dense_vector", "dims": 1024, "element_type": "byte", }, "text": {"type": "text"}, "id": {"type": "integer"}, "title": {"type": "text"} } }, )
Create the inference pipeline
editNow you have an inference endpoint and an index ready to store embeddings. The next step is to create an ingest pipeline with an inference processor that will create the embeddings using the inference endpoint and stores them in the index.
client.ingest.put_pipeline( id="cohere_embeddings", description="Ingest pipeline for Cohere inference.", processors=[ { "inference": { "model_id": "cohere_embeddings", "input_output": { "input_field": "text", "output_field": "text_embedding", }, } } ], )
Prepare data and insert documents
editThis example uses the SciFact data set that you can find on HuggingFace.
url = 'https://huggingface.co/datasets/mteb/scifact/raw/main/corpus.jsonl' # Fetch the JSONL data from the URL response = requests.get(url) response.raise_for_status() # Ensure noticing bad responses # Split the content by new lines and parse each line as JSON data = [json.loads(line) for line in response.text.strip().split('\n') if line] # Now data is a list of dictionaries # Change `_id` key to `id` as `_id` is a reserved key in Elasticsearch. for item in data: if '_id' in item: item['id'] = item.pop('_id') # Prepare the documents to be indexed documents = [] for line in data: data_dict = line documents.append({ "_index": "cohere-embeddings", "_source": data_dict, } ) # Use the bulk endpoint to index helpers.bulk(client, documents) print("Data ingestion completed, text embeddings generated!")
Your index is populated with the SciFact data and text embeddings for the text field.
Hybrid search
editLet’s start querying the index!
The code below performs a hybrid search. The kNN
query computes the relevance
of search results based on vector similarity using the text_embedding
field,
the lexical search query uses BM25 retrieval to compute keyword similarity on
the title
and text
fields.
query = "What is biosimilarity?" response = client.search( index="cohere-embeddings", size=100, knn={ "field": "text_embedding", "query_vector_builder": { "text_embedding": { "model_id": "cohere_embeddings", "model_text": query, } }, "k": 10, "num_candidates": 50, }, query={ "multi_match": { "query": query, "fields": ["text", "title"] } } ) raw_documents = response["hits"]["hits"] # Display the first 10 results for document in raw_documents[0:10]: print(f'Title: {document["_source"]["title"]}\nText: {document["_source"]["text"]}\n') # Format the documents for ranking documents = [] for hit in response["hits"]["hits"]: documents.append(hit["_source"]["text"])
Rerank search results
editTo combine the results more effectively, use Cohere’s Rerank v3 model through the inference API to provide a more precise semantic reranking of the results.
Create an inference endpoint with your Cohere API key and the used model name as
the model_id
(rerank-english-v3.0
in this example).
client.inference.put_model( task_type="rerank", inference_id="cohere_rerank", body={ "service": "cohere", "service_settings":{ "api_key": COHERE_API_KEY, "model_id": "rerank-english-v3.0" }, "task_settings": { "top_n": 10, }, } )
Rerank the results using the new inference endpoint.
# Pass the query and the search results to the service response = client.inference.inference( inference_id="cohere_rerank", body={ "query": query, "input": documents, "task_settings": { "return_documents": False } } ) # Reconstruct the input documents based on the index provided in the rereank response ranked_documents = [] for document in response.body["rerank"]: ranked_documents.append({ "title": raw_documents[int(document["index"])]["_source"]["title"], "text": raw_documents[int(document["index"])]["_source"]["text"] }) # Print the top 10 results for document in ranked_documents[0:10]: print(f"Title: {document['title']}\nText: {document['text']}\n")
The response is a list of documents in descending order of relevance. Each document has a corresponding index that reflects the order of the documents when they were sent to the inference endpoint.
Retrieval Augmented Generation (RAG) with Cohere and Elasticsearch
editRAG is a method for generating text using additional information fetched from an external data source. With the ranked results, you can build a RAG system on the top of what you previously created by using Cohere’s Chat API.
Pass in the retrieved documents and the query to receive a grounded response using Cohere’s newest generative model Command R+.
Then pass in the query and the documents to the Chat API, and print out the response.
response = co.chat(message=query, documents=ranked_documents, model='command-r-plus') source_documents = [] for citation in response.citations: for document_id in citation.document_ids: if document_id not in source_documents: source_documents.append(document_id) print(f"Query: {query}") print(f"Response: {response.text}") print("Sources:") for document in response.documents: if document['id'] in source_documents: print(f"{document['title']}: {document['text']}")
The response will look similar to this:
Query: What is biosimilarity? Response: Biosimilarity is based on the comparability concept, which has been used successfully for several decades to ensure close similarity of a biological product before and after a manufacturing change. Over the last 10 years, experience with biosimilars has shown that even complex biotechnology-derived proteins can be copied successfully. Sources: Interchangeability of Biosimilars: A European Perspective: (...)
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