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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 numpy as np | |
import pandas as pd | |
from tqdm import tqdm | |
from transformers import BertModel, BertTokenizer | |
def encode_query(text, tokenizer, model, device='cpu'): | |
max_length = 36 # hardcode for now | |
inputs = tokenizer( | |
'[CLS] [Q] ' + text + ' [MASK]' * max_length, | |
max_length=max_length, | |
truncation=True, | |
add_special_tokens=False, | |
return_tensors='pt' | |
) | |
inputs.to(device) | |
outputs = model(**inputs) | |
embeddings = outputs.last_hidden_state.detach().cpu().numpy() | |
return np.average(embeddings[:, 4:, :], axis=-2).flatten() | |
if __name__ == '__main__': | |
parser = argparse.ArgumentParser() | |
parser.add_argument('--encoder', type=str, help='encoder name or path', required=True) | |
parser.add_argument('--input', type=str, help='query file to be encoded.', required=True) | |
parser.add_argument('--output', type=str, help='path to store query embeddings', required=True) | |
parser.add_argument('--device', type=str, | |
help='device cpu or cuda [cuda:0, cuda:1...]', default='cpu', required=False) | |
args = parser.parse_args() | |
tokenizer = BertTokenizer.from_pretrained(args.encoder) | |
model = BertModel.from_pretrained(args.encoder) | |
model.to(args.device) | |
embeddings = {'id': [], 'text': [], 'embedding': []} | |
for line in tqdm(open(args.input, 'r').readlines()): | |
qid, text = line.rstrip().split('\t') | |
qid = qid.strip() | |
text = text.strip() | |
embeddings['id'].append(qid) | |
embeddings['text'].append(text) | |
embeddings['embedding'].append(encode_query(text, tokenizer, model, args.device)) | |
embeddings = pd.DataFrame(embeddings) | |
embeddings.to_pickle(args.output) | |