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# | |
# Pyserini: Reproducible IR research with sparse and dense representations | |
# | |
# Licensed under the Apache License, Version 2.0 (the "License"); | |
# you may not use this file except in compliance with the License. | |
# You may obtain a copy of the License at | |
# | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# | |
# Unless required by applicable law or agreed to in writing, software | |
# distributed under the License is distributed on an "AS IS" BASIS, | |
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
# See the License for the specific language governing permissions and | |
# limitations under the License. | |
# | |
import argparse | |
import faiss | |
import os | |
parser = argparse.ArgumentParser() | |
parser.add_argument('--dimension', type=int, help='dimension of passage embeddings', required=False, default=768) | |
parser.add_argument('--prefix', type=str, help='directory to store brute force index of corpus', required=True) | |
parser.add_argument('--segment-num', type=int, help='number of passage segments, use -1 for MaxP', default=1) | |
parser.add_argument('--shard-num', type=int, help='number of shards', default=1) | |
args = parser.parse_args() | |
new_index = faiss.IndexFlatIP(args.dimension) | |
docid_list = [] | |
for i in range(args.shard_num): | |
index = os.path.join(args.prefix + f"{i:02d}", 'index') | |
docid = os.path.join(args.prefix + f"{i:02d}", 'docid') | |
print(f"reading ... {index}") | |
line_idx = [] | |
with open(docid, 'r') as f: | |
for idx, line in enumerate(f): | |
doc_id, psg_id = line.strip().split("#") | |
if args.segment_num == -1: | |
line_idx.append(idx) | |
docid_list.append(doc_id + "#" + psg_id) | |
elif int(psg_id) < args.segment_num: | |
line_idx.append(idx) | |
docid_list.append(doc_id + "#" + psg_id) | |
index = faiss.read_index(index) | |
vectors = index.reconstruct_n(0, index.ntotal) | |
new_index.add(vectors[line_idx]) # filter segments | |
if args.segment_num == -1: | |
postfix = 'maxp' | |
elif args.segment_num == 1: | |
postfix = 'firstp' | |
else: | |
postfix = f'seg{args.segment_num}' | |
if not os.path.exists(args.prefix + f'full-{postfix}'): | |
os.mkdir(args.prefix + f'full-{postfix}') | |
print(f"number of docs: {len(docid_list)}") | |
print(f"number of vecs: {new_index.ntotal}") | |
assert len(docid_list) == new_index.ntotal | |
faiss.write_index(new_index, os.path.join(args.prefix + f'full-{postfix}', 'index')) | |
with open(os.path.join(args.prefix + f'full-{postfix}', 'docid'), 'w') as wfd: | |
for docid in docid_list: | |
wfd.write(docid + '\n') | |