Haystack PipelineConnectError Cannot connect replies to query output with bm25 retriever query

Question

Can you tell me Haystack PipelineConnectError: Cannot connect 'replies_to_query.output' with 'bm25_retriever.query'

Answer 1

The PipelineConnectError in Haystack when using a BM25 retriever occurs due to incompatible pipeline connections, which can be fixed by ensuring that the query output is correctly linked to the retriever input.

Here is the code snippet you can refer to:

In the above code we are using the following key points:

• Uses an InMemoryDocumentStore for simple BM25-based retrieval.
• Initializes the BM25Retriever to fetch top-k documents.
• Ensures Proper Pipeline Connection between the retriever and reader.
• Runs an Extractive Q&A Pipeline without connection errors.
• Handles Query Processing Correctly to prevent PipelineConnectError.

Hence, correctly linking the query output to the retriever input in the Haystack pipeline prevents PipelineConnectError and enables seamless document retrieval with BM25.