Pipeline Templates

Haystack provides templates to create read-made pipelines for common use cases.

To create a pipeline, the method from_templateof the Pipeline class can be called passing a template identifier in the form PredefinedPipeline.TEMPLATE_IDENTIFIER.

For example, to create and run a pipeline using the INDEXING template you would use Pipeline.from_template(PredefinedPipeline.INDEXING)

In this section we detail the available templates and how they can be used.

Chat with website

Generates a pipeline to read a web page and ask questions about its content.

Example code:

from haystack import Pipeline, PredefinedPipeline

pipeline = Pipeline.from_template(PredefinedPipeline.CHAT_WITH_WEBSITE)
pipeline.run({"fetcher": {"urls": ["https://haystack.deepset.ai:"]}, "prompt": {"query": "what is Haystack?"}})

Generative QA

Generates a simple pipeline to ask a generic query using an OpenAIGenerator.

Example code:

from haystack import Pipeline, PredefinedPipeline

pipeline = Pipeline.from_template(PredefinedPipeline.GENERATIVE_QA)
pipeline.run({"prompt_builder":{"question":"Where is Rome?"}})

Indexing

Generates a pipeline that imports documents from one or more text files, creates the embeddings for each of them and finally stores them into a Chroma database.

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Additional installation required

This templates requires the chroma-haystack integration to work, you can install it with:

pip install chroma-haystack

Code example:

from haystack import Pipeline, PredefinedPipeline

pipeline = Pipeline.from_template(PredefinedPipeline.INDEXING)
result = pipe.run({"converter": {"sources": ["some_file.txt"]}})

RAG

Generates a RAG pipeline using data that was previously indexed (you can use the Indexing template).

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Additional installation required

This templates requires the chroma-haystack integration to work, you can install it with:

pip install chroma-haystack

Example code:

from haystack import Pipeline, PredefinedPipeline

pipeline = Pipeline.from_template(PredefinedPipeline.RAG)
pipeline.run({"text_embedder": {"text": "A question about your documents"}})