sentence-transformers/all-mpnet-base-v2 的 ONNX 版本

这是 https://huggingface.co/sentence-transformers/all-mpnet-base-v2 的 ONNX 版本，已验证生成的嵌入向量相同。

针对 CPU 使用进行了优化。

转换

使用 convert.py 脚本也可以创建相同的检查点。

使用方法 - transformers

与 sentence-transformers/all-mpnet-base-v2 完全相同，只是使用 optimum 的 ORTModelForFeatureExtraction。

pip install optimum[onnxruntime]

from transformers import AutoTokenizer
from optimum.onnxruntime import ORTModelForFeatureExtraction
import torch
import torch.nn.functional as F

# 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('yilunzhang/all-mpnet-base-v2-onnx')
model = ORTModelForFeatureExtraction.from_pretrained('yilunzhang/all-mpnet-base-v2-onnx')

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

# Normalize embeddings
sentence_embeddings = F.normalize(sentence_embeddings, p=2, dim=1)

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