Ko Sroberta Multitask

🚀 韩语多任务句子嵌入模型ko - sroberta - multitask

本模型是基于 sentence - transformers 的模型，它能够将句子和段落映射到 768 维的密集向量空间，可用于聚类、语义搜索等任务。

🚀 快速开始

📦 安装指南

若已安装 sentence - transformers，使用此模型将十分便捷：

pip install -U sentence-transformers

💻 使用示例

基础用法

使用 sentence - transformers 库调用模型：

from sentence_transformers import SentenceTransformer
sentences = ["안녕하세요?", "한국어 문장 임베딩을 위한 버트 모델입니다."]

model = SentenceTransformer('jhgan/ko-sroberta-multitask')
embeddings = model.encode(sentences)
print(embeddings)

高级用法

若未安装 sentence - transformers，可按以下方式使用模型：首先将输入数据传入 Transformer 模型，然后对上下文词嵌入应用合适的池化操作。

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('jhgan/ko-sroberta-multitask')
model = AutoModel.from_pretrained('jhgan/ko-sroberta-multitask')

# 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, mean pooling.
sentence_embeddings = mean_pooling(model_output, encoded_input['attention_mask'])

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

📚 详细文档

🔍 评估结果

该模型在 KorSTS、KorNLI 训练数据集上进行多任务训练后，使用 KorSTS 评估数据集进行评估，结果如下：

🔧 技术细节

训练参数

• 数据加载器 1：
  • 类型：sentence_transformers.datasets.NoDuplicatesDataLoader.NoDuplicatesDataLoader
  • 长度：8885
  • 参数：

  {'batch_size': 64}
  

• 损失函数 1：
  • 类型：sentence_transformers.losses.MultipleNegativesRankingLoss.MultipleNegativesRankingLoss
  • 参数：

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

• 数据加载器 2：
  • 类型：torch.utils.data.dataloader.DataLoader
  • 长度：719
  • 参数：

  {'batch_size': 8, 'sampler': 'torch.utils.data.sampler.RandomSampler', 'batch_sampler': 'torch.utils.data.sampler.BatchSampler'}
  

• 损失函数 2：
  • 类型：sentence_transformers.losses.CosineSimilarityLoss.CosineSimilarityLoss

训练方法参数

{
    "epochs": 5,
    "evaluation_steps": 1000,
    "evaluator": "sentence_transformers.evaluation.EmbeddingSimilarityEvaluator.EmbeddingSimilarityEvaluator",
    "max_grad_norm": 1,
    "optimizer_class": "<class 'transformers.optimization.AdamW'>",
    "optimizer_params": {
        "lr": 2e-05
    },
    "scheduler": "WarmupLinear",
    "steps_per_epoch": null,
    "warmup_steps": 360,
    "weight_decay": 0.01
}

🏗️ 完整模型架构

SentenceTransformer(
  (0): Transformer({'max_seq_length': 128, 'do_lower_case': False}) with Transformer model: RobertaModel 
  (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})
)

📄 引用与作者

• Ham, J., Choe, Y. J., Park, K., Choi, I., & Soh, H. (2020). Kornli and korsts: New benchmark datasets for korean natural language understanding. arXiv preprint arXiv:2004.03289
• Reimers, Nils and Iryna Gurevych. “Sentence - BERT: Sentence Embeddings using Siamese BERT - Networks.” ArXiv abs/1908.10084 (2019)
• Reimers, Nils and Iryna Gurevych. “Making Monolingual Sentence Embeddings Multilingual Using Knowledge Distillation.” EMNLP (2020).