mirror of
https://github.com/deepset-ai/haystack.git
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167 lines
7.6 KiB
Python
167 lines
7.6 KiB
Python
from haystack.document_store.elasticsearch import ElasticsearchDocumentStore
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from haystack.preprocessor.utils import fetch_archive_from_http
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from haystack.retriever.sparse import ElasticsearchRetriever
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from haystack.retriever.dense import DensePassageRetriever
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from haystack.eval import EvalAnswers, EvalDocuments
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from haystack.reader.farm import FARMReader
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from haystack.preprocessor import PreProcessor
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from haystack.utils import launch_es
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from haystack import Pipeline
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from farm.utils import initialize_device_settings
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import logging
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logger = logging.getLogger(__name__)
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def tutorial5_evaluation():
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##############################################
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# Settings
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##############################################
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# Choose from Evaluation style from ['retriever_closed', 'reader_closed', 'retriever_reader_open']
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# 'retriever_closed' - evaluates only the retriever, based on whether the gold_label document is retrieved.
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# 'reader_closed' - evaluates only the reader in a closed domain fashion i.e. the reader is given one query
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# and one document and metrics are calculated on whether the right position in this text is selected by
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# the model as the answer span (i.e. SQuAD style)
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# 'retriever_reader_open' - evaluates retriever and reader in open domain fashion i.e. a document is considered
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# correctly retrieved if it contains the answer string within it. The reader is evaluated based purely on the
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# predicted string, regardless of which document this came from and the position of the extracted span.
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style = "retriever_reader_open"
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# make sure these indices do not collide with existing ones, the indices will be wiped clean before data is inserted
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doc_index = "tutorial5_docs"
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label_index = "tutorial5_labels"
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##############################################
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# Code
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##############################################
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launch_es()
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device, n_gpu = initialize_device_settings(use_cuda=True)
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# Download evaluation data, which is a subset of Natural Questions development set containing 50 documents
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doc_dir = "../data/nq"
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s3_url = "https://s3.eu-central-1.amazonaws.com/deepset.ai-farm-qa/datasets/nq_dev_subset_v2.json.zip"
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fetch_archive_from_http(url=s3_url, output_dir=doc_dir)
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# Connect to Elasticsearch
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document_store = ElasticsearchDocumentStore(
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host="localhost", username="", password="", index="document",
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create_index=False, embedding_field="emb",
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embedding_dim=768, excluded_meta_data=["emb"]
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)
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# Add evaluation data to Elasticsearch document store
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# We first delete the custom tutorial indices to not have duplicate elements
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# and also split our documents into shorter passages using the PreProcessor
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preprocessor = PreProcessor(
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split_by="word",
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split_length=500,
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split_overlap=0,
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split_respect_sentence_boundary=False,
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clean_empty_lines=False,
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clean_whitespace=False
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)
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document_store.delete_all_documents(index=doc_index)
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document_store.delete_all_documents(index=label_index)
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document_store.add_eval_data(
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filename="../data/nq/nq_dev_subset_v2.json",
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doc_index=doc_index,
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label_index=label_index,
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preprocessor=preprocessor
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)
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# Let's prepare the labels that we need for the retriever and the reader
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labels = document_store.get_all_labels_aggregated(index=label_index)
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# Initialize Retriever
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retriever = ElasticsearchRetriever(document_store=document_store)
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# Alternative: Evaluate DensePassageRetriever
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# Note, that DPR works best when you index short passages < 512 tokens as only those tokens will be used for the embedding.
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# Here, for nq_dev_subset_v2.json we have avg. num of tokens = 5220(!).
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# DPR still outperforms Elastic's BM25 by a small margin here.
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# retriever = DensePassageRetriever(document_store=document_store,
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# query_embedding_model="facebook/dpr-question_encoder-single-nq-base",
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# passage_embedding_model="facebook/dpr-ctx_encoder-single-nq-base",
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# use_gpu=True,
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# embed_title=True,
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# remove_sep_tok_from_untitled_passages=True)
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# document_store.update_embeddings(retriever, index=doc_index)
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# Initialize Reader
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reader = FARMReader(
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model_name_or_path="deepset/roberta-base-squad2",
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top_k=4,
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return_no_answer=True
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)
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# Here we initialize the nodes that perform evaluation
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eval_retriever = EvalDocuments()
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eval_reader = EvalAnswers()
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## Evaluate Retriever on its own in closed domain fashion
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if style == "retriever_closed":
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retriever_eval_results = retriever.eval(top_k=10, label_index=label_index, doc_index=doc_index)
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## Retriever Recall is the proportion of questions for which the correct document containing the answer is
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## among the correct documents
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print("Retriever Recall:", retriever_eval_results["recall"])
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## Retriever Mean Avg Precision rewards retrievers that give relevant documents a higher rank
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print("Retriever Mean Avg Precision:", retriever_eval_results["map"])
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# Evaluate Reader on its own in closed domain fashion (i.e. SQuAD style)
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elif style == "reader_closed":
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reader_eval_results = reader.eval(document_store=document_store, device=device, label_index=label_index, doc_index=doc_index)
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# Evaluation of Reader can also be done directly on a SQuAD-formatted file without passing the data to Elasticsearch
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#reader_eval_results = reader.eval_on_file("../data/nq", "nq_dev_subset_v2.json", device=device)
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## Reader Top-N-Accuracy is the proportion of predicted answers that match with their corresponding correct answer
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print("Reader Top-N-Accuracy:", reader_eval_results["top_n_accuracy"])
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## Reader Exact Match is the proportion of questions where the predicted answer is exactly the same as the correct answer
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print("Reader Exact Match:", reader_eval_results["EM"])
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## Reader F1-Score is the average overlap between the predicted answers and the correct answers
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print("Reader F1-Score:", reader_eval_results["f1"])
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# Evaluate combination of Reader and Retriever in open domain fashion
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elif style == "retriever_reader_open":
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# Here is the pipeline definition
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p = Pipeline()
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p.add_node(component=retriever, name="ESRetriever", inputs=["Query"])
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p.add_node(component=eval_retriever, name="EvalDocuments", inputs=["ESRetriever"])
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p.add_node(component=reader, name="QAReader", inputs=["EvalDocuments"])
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p.add_node(component=eval_reader, name="EvalAnswers", inputs=["QAReader"])
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results = []
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for l in labels:
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res = p.run(
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query=l.question,
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top_k_retriever=10,
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labels=l,
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top_k_reader=10,
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index=doc_index,
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)
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results.append(res)
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eval_retriever.print()
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print()
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retriever.print_time()
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print()
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eval_reader.print(mode="reader")
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print()
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reader.print_time()
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print()
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eval_reader.print(mode="pipeline")
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else:
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raise ValueError(f'style={style} is not a valid option. Choose from retriever_closed, reader_closed, retriever_reader_open')
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if __name__ == "__main__":
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tutorial5_evaluation()
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# This Haystack script was made with love by deepset in Berlin, Germany
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# Haystack: https://github.com/deepset-ai/haystack
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# deepset: https://deepset.ai/ |