flagopen--flagembedding
wehub-resource-sync
128 行
5.1 KiB
Python
128 行
5.1 KiB
Python
import os
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import logging
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import gc
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import torch
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import numpy as np
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from typing import Any, Dict, Optional
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from FlagEmbedding.abc.evaluation.utils import index, search
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from FlagEmbedding.abc.evaluation import EvalRetriever
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logger = logging.getLogger(__name__)
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class BrightEvalDenseRetriever(EvalRetriever):
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"""
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Child class of :class:EvalRetriever for dense retrieval.
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"""
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def __call__(
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self,
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corpus: Dict[str, Dict[str, Any]],
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queries: Dict[str, str],
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corpus_embd_save_dir: Optional[str] = None,
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ignore_identical_ids: bool = False,
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**kwargs,
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) -> Dict[str, Dict[str, float]]:
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"""
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This is called during the retrieval process.
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Parameters:
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corpus: Dict[str, Dict[str, Any]]: Corpus of documents.
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Structure: {<docid>: {"text": <text>}}.
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Example: {"doc-0": {"text": "This is a document."}}
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queries: Dict[str, str]: Queries to search for.
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Structure: {<qid>: <query>}.
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Example: {"q-0": "This is a query."}
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corpus_embd_save_dir (Optional[str]): Defaults to :data:`None`.
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ignore_identical_ids (bool): Defaults to :data:`False`.
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**kwargs: Any: Additional arguments.
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Returns: Dict[str, Dict[str, float]]: Top-k search results for each query. k is specified by search_top_k.
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Structure: {qid: {docid: score}}. The higher is the score, the more relevant is the document.
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Example: {"q-0": {"doc-0": 0.9}}
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"""
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if ignore_identical_ids:
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logger.warning("ignore_identical_ids is set to True. This means that the search results will not contain identical ids. Note: Dataset such as MIRACL should NOT set this to True.")
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# dense embedding models do not require language as input: AIRBench evaluation
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kwargs.pop("language", None)
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corpus_ids = []
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corpus_texts = []
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for docid, doc in corpus.items():
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corpus_ids.append(docid)
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corpus_texts.append(
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doc["text"] if "title" not in doc
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else f"{doc['title']} {doc['text']}".strip()
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)
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queries_ids = []
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queries_texts = []
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for qid, query in queries.items():
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queries_ids.append(qid)
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queries_texts.append(query)
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# NOTE: obtain excluded ids from qrels to remove corresponding documents from raw search results
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excluded_ids = {}
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qrels = kwargs.pop("retriever_qrels", None)
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if qrels is not None:
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for qid in qrels:
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excluded_ids[qid] = []
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for docid, score in qrels[qid].items():
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if score != 1:
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excluded_ids[qid].append(docid)
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else:
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logger.warning("No qrels provided, so no documents will be excluded.")
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if corpus_embd_save_dir is not None:
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if os.path.exists(os.path.join(corpus_embd_save_dir, "doc.npy")) and not self.overwrite:
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corpus_emb = np.load(os.path.join(corpus_embd_save_dir, "doc.npy"))
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else:
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corpus_emb = self.embedder.encode_corpus(corpus_texts, **kwargs)
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else:
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corpus_emb = self.embedder.encode_corpus(corpus_texts, **kwargs)
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queries_emb = self.embedder.encode_queries(queries_texts, **kwargs)
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# check if the embeddings are in dictionary format: M3Embedder
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if isinstance(corpus_emb, dict):
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corpus_emb = corpus_emb["dense_vecs"]
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if isinstance(queries_emb, dict):
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queries_emb = queries_emb["dense_vecs"]
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if corpus_embd_save_dir is not None and \
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(not os.path.exists(os.path.join(corpus_embd_save_dir, "doc.npy")) or self.overwrite):
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os.makedirs(corpus_embd_save_dir, exist_ok=True)
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np.save(os.path.join(corpus_embd_save_dir, "doc.npy"), corpus_emb)
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gc.collect()
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torch.cuda.empty_cache()
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faiss_index = index(corpus_embeddings=corpus_emb)
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all_scores, all_indices = search(query_embeddings=queries_emb, faiss_index=faiss_index, k=self.search_top_k)
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results = {}
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for idx, (scores, indices) in enumerate(zip(all_scores, all_indices)):
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query_id = queries_ids[idx]
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results[query_id] = {}
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for score, indice in zip(scores, indices):
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if indice != -1:
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if ignore_identical_ids and corpus_ids[indice] == query_id:
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continue
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results[query_id][corpus_ids[indice]] = float(score)
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if qrels is not None:
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# NOTE: Filter out documents with ids in excluded_ids
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for docid in set(excluded_ids[query_id]):
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if docid != "N/A":
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results[query_id].pop(docid, None)
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sorted_scores = sorted(results[query_id].items(), key=lambda item: item[1], reverse=True)
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# Store the top-k results for the current query
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results[query_id] = {}
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for docid, score in sorted_scores[:self.search_top_k]:
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results[query_id][docid] = float(score)
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return results
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