haystack/test/test_tfidf_retriever.py

from haystack.database.base import Document


def test_tfidf_retriever():
    from haystack.retriever.sparse import TfidfRetriever

    test_docs = [
        {"name": "testing the finder 1", "text": "godzilla says hello"},
        {"name": "testing the finder 2", "text": "optimus prime says bye"},
        {"name": "testing the finder 3", "text": "alien says arghh"}
    ]

    from haystack.database.memory import InMemoryDocumentStore
    document_store = InMemoryDocumentStore()
    document_store.write_documents(test_docs)

    retriever = TfidfRetriever(document_store)
    retriever.fit()
    assert retriever.retrieve("godzilla", top_k=1) == [
        Document(
            id='0',
            text='godzilla says hello',
            external_source_id=None,
            question=None,
            query_score=None,
            meta={"name": "testing the finder 1"},
        )
    ]