（初研） Sentence-embedding fine-tune notebook

由于工作需要，需要对embedding模型进行微调，我调用了几种方案，都比较繁琐。先记录一个相对简单的方案。以下内容并不一定正确，请刷到的大佬给予指正，不胜感激！！！

一.对BGE模型，如bge-large-zh 、bge-large-en

二.对sentensce embedding bert model ,如多语言模型 distiluse-base-multilingual-cased-v1

三.对于sentence embedding bert model 使用 towhee 进行微调，以下主要对这个方案进行阐述：

做微调之前需要准备微调样本数据，准备方式，我目前思考跟第二种方案是一样的。我偷懒，先验证代码可以跑通，所以用了example dataset

1. git clone 代码.

参考链接：

sentence-embedding/sbert - sbert - Towhee

git clone https://towhee.io/sentence-embedding/sbert.git

2. 配置python环境

conda create -n sentence-embedding-3.9 python=3.9 -y

#进入代码根目录

pip install -r requirement.txt

pip install towhee

3.运行微调代码（其实就是继续训练原有模型）

修改微调核心代码如下：

if __name__ == '__main__':
    PROJ_DIR = '/data2/04_embedding/finetune/sentence-embedding/'
    sys.path.append(os.path.join(PROJ_DIR, 'sbert'))
    from sentence_transformers import util
    # op = STransformers(model_name='nli-distilroberta-base-v2')
    op = STransformers(model_name='distiluse-base-multilingual-cased-v1')
    # Check if dataset exsist. If not, download and extract  it
    sts_dataset_path = 'datasets/stsbenchmark.tsv.gz'

    if not os.path.exists(sts_dataset_path):
        util.http_get('https://sbert.net/datasets/stsbenchmark.tsv.gz', sts_dataset_path)

    training_config = {
        'sts_dataset_path': sts_dataset_path,
        'train_batch_size': 16,
        'num_epochs': 4,
        'model_save_path': './output'
    }
    op.train(training_config)

python s_bert.py

发生下载数据集错误

urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='sbert.net', port=443): Max retries exceeded with url: /datasets/stsbenchmark.tsv.gz (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f6bf717ad00>: Failed to establish a new connection: [Errno 101] Network is unreachable'))

手动下载，并放到datasets目录下。

发生相对包引用错误

You may be able to resolve this warning by setting `model_config['protected_namespaces'] = ()`.
warnings.warn(
Traceback (most recent call last):
File "/data2/04_embedding/finetune/sentence-embedding/sbert/s_bert.py", line 281, in <module>
op.train(training_config)
File "/data2/04_embedding/finetune/sentence-embedding/sbert/s_bert.py", line 260, in train
from .train_sts_task import train_sts
ImportError: attempted relative import with no known parent package

参考我的另一个记录：ImportError: attempted relative import with no known parent package-CSDN博客

微调结果：

剩下的就是测试模型了（待续）。。。