Multi Qa MiniLM BERT Tiny Distill L 2 H 128 A Cos V1

🚀 rawsh/multi-qa-MiniLM-BERT-Tiny-distill-L-2_H-128_A-cos-v1

這是一個 sentence-transformers 模型，它可以將句子和段落映射到一個 128 維的密集向量空間，可用於聚類或語義搜索等任務。該模型基於 nreimers/BERT-Tiny_L-2_H-128_A-2，教師模型為 multi-qa-MiniLM-L6-cos-v1。雖然性能一般，但模型大小僅 5MB。

模型信息

評估結果

2023-06-05 15:28:46 - EmbeddingSimilarityEvaluator: Evaluating the model on sts-dev dataset after epoch 0:                                                       
2023-06-05 15:28:47 - Cosine-Similarity :       Pearson: 0.7336 Spearman: 0.7582                                                                                 
2023-06-05 15:28:47 - Manhattan-Distance:       Pearson: 0.7960 Spearman: 0.7976                                                                                 
2023-06-05 15:28:47 - Euclidean-Distance:       Pearson: 0.7968 Spearman: 0.7984                                                                                 
2023-06-05 15:28:47 - Dot-Product-Similarity:   Pearson: 0.5599 Spearman: 0.5410                                                                                 
2023-06-05 15:28:48 - MSE evaluation (lower = better) on  dataset after epoch 0:                                                                                 
2023-06-05 15:28:48 - MSE (*100):       0.152902

對於該模型的自動評估，請參考 Sentence Embeddings Benchmark: https://seb.sbert.net

🚀 快速開始

安裝依賴

若要使用此模型，需先安裝 sentence-transformers：

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('{MODEL_NAME}')
embeddings = model.encode(sentences)
print(embeddings)

高級用法（HuggingFace Transformers）

若未安裝 sentence-transformers，可以按以下方式使用該模型：首先將輸入數據傳入 Transformer 模型，然後對上下文相關的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('{MODEL_NAME}')
model = AutoModel.from_pretrained('{MODEL_NAME}')

# 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)

🔧 技術細節

訓練參數

該模型使用以下參數進行訓練：

數據加載器： torch.utils.data.dataloader.DataLoader，長度為 141164，參數如下：

{'batch_size': 64, 'sampler': 'torch.utils.data.sampler.RandomSampler', 'batch_sampler': 'torch.utils.data.sampler.BatchSampler'}

損失函數： sentence_transformers.losses.MSELoss.MSELoss

fit() 方法的參數：

{
    "epochs": 1,
    "evaluation_steps": 5000,
    "evaluator": "sentence_transformers.evaluation.SequentialEvaluator.SequentialEvaluator",
    "max_grad_norm": 1,
    "optimizer_class": "<class 'torch.optim.adamw.AdamW'>",
    "optimizer_params": {
        "eps": 1e-06,
        "lr": 0.0001
    },
    "scheduler": "WarmupLinear",
    "steps_per_epoch": null,
    "warmup_steps": 1000,
    "weight_decay": 0.01
}

完整模型架構

SentenceTransformer(
  (0): Transformer({'max_seq_length': 512, 'do_lower_case': False}) with Transformer model: BertModel 
  (1): Pooling({'word_embedding_dimension': 128, '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

如需瞭解更多信息，請參考相關文檔。