S PubMedBert MS MARCO SCIFACT

🚀 S-PubMedBert-MS-MARCO-SCIFACT

這是一個 sentence-transformers 模型，它可以將句子和段落映射到一個 768 維的密集向量空間，可用於聚類或語義搜索等任務。

🚀 快速開始

本模型可通過 sentence-transformers 庫或 HuggingFace Transformers 庫使用，下面為你分別介紹使用方法。

📦 安裝指南

若使用 sentence-transformers 庫，需要先安裝該庫：

pip install -U sentence-transformers

💻 使用示例

基礎用法（Sentence-Transformers）

from sentence_transformers import SentenceTransformer
sentences = ["This is an example sentence", "Each sentence is converted"]

model = SentenceTransformer('S-PubMedBert-MS-MARCO-SCIFACT')
embeddings = model.encode(sentences)
print(embeddings)

基礎用法（HuggingFace Transformers）

若不使用 sentence-transformers 庫，可按以下方式使用模型：首先，將輸入數據傳入 Transformer 模型，然後對上下文詞嵌入應用正確的池化操作。

from transformers import AutoTokenizer, AutoModel
import torch


#Mean Pooling - Take attention mask into account for correct averaging
def mean_pooling(model_output, attention_mask):
    token_embeddings = model_output[0] #First element of model_output contains all token embeddings
    input_mask_expanded = attention_mask.unsqueeze(-1).expand(token_embeddings.size()).float()
    return torch.sum(token_embeddings * input_mask_expanded, 1) / torch.clamp(input_mask_expanded.sum(1), min=1e-9)


# Sentences we want sentence embeddings for
sentences = ['This is an example sentence', 'Each sentence is converted']

# Load model from HuggingFace Hub
tokenizer = AutoTokenizer.from_pretrained('S-PubMedBert-MS-MARCO-SCIFACT')
model = AutoModel.from_pretrained('S-PubMedBert-MS-MARCO-SCIFACT')

# Tokenize sentences
encoded_input = tokenizer(sentences, padding=True, truncation=True, return_tensors='pt')

# Compute token embeddings
with torch.no_grad():
    model_output = model(**encoded_input)

# Perform pooling. In this case, max pooling.
sentence_embeddings = mean_pooling(model_output, encoded_input['attention_mask'])

print("Sentence embeddings:")
print(sentence_embeddings)

📚 詳細文檔

評估結果

若要對該模型進行自動評估，請參考 Sentence Embeddings Benchmark：https://seb.sbert.net

訓練

該模型使用以下參數進行訓練：

數據加載器： sentence_transformers.datasets.NoDuplicatesDataLoader.NoDuplicatesDataLoader，長度為 560，參數如下：

{'batch_size': 16}

損失函數： sentence_transformers.losses.MultipleNegativesRankingLoss.MultipleNegativesRankingLoss，參數如下：

{'scale': 20.0, 'similarity_fct': 'cos_sim'}

fit() 方法的參數：

{
    "callback": null,
    "epochs": 1,
    "evaluation_steps": 10000,
    "evaluator": "sentence_transformers.evaluation.SequentialEvaluator.SequentialEvaluator",
    "max_grad_norm": 1,
    "optimizer_class": "<class 'transformers.optimization.AdamW'>",
    "optimizer_params": {
        "correct_bias": false,
        "eps": 1e-06,
        "lr": 2e-05
    },
    "scheduler": "WarmupLinear",
    "steps_per_epoch": null,
    "warmup_steps": 56,
    "weight_decay": 0.01
}

完整模型架構

SentenceTransformer(
  (0): Transformer({'max_seq_length': 350, 'do_lower_case': False}) with Transformer model: BertModel 
  (1): Pooling({'word_embedding_dimension': 768, 'pooling_mode_cls_token': False, 'pooling_mode_mean_tokens': True, 'pooling_mode_max_tokens': False, 'pooling_mode_mean_sqrt_len_tokens': False})
)

引用與作者

如果使用該模型，請引用以下論文：

@article{deka2022improved,
  title={Improved Methods To Aid Unsupervised Evidence-Based Fact Checking For Online Health News},
  author={Deka, Pritam and Jurek-Loughrey, Anna and Deepak, P},
  journal={Journal of Data Intelligence},
  volume={3},
  number={4},
  pages={474--504},
  year={2022}
}