大模型：qwen2-7B

数据集：魔搭社区​​​​​

可视化工具：swanlab

数据集下载：直接下载，别用git，会因为文件太大，git版本等问题出错

微调代码：

import json
import pandas as pd
import torch
from datasets import Dataset
from modelscope import snapshot_download, AutoTokenizer
from swanlab.integration.huggingface import SwanLabCallback
from peft import LoraConfig, TaskType, get_peft_model
from transformers import AutoModelForCausalLM, TrainingArguments, Trainer, DataCollatorForSeq2Seq
import os
import swanlab

def dataset_jsonl_transfer(origin_path, new_path):
    """
    将原始数据集转换为大模型微调所需数据格式的新数据集
    """
    messages = []

    # 读取旧的JSONL文件
    with open(origin_path, "r") as file:
        for line in file:
            # 解析每一行的json数据
            data = json.loads(line)
            context = data["text"]
            catagory = data["category"]
            label = data["output"]
            message = {
                "instruction": "你是一个文本分类领域的专家，你会接收到一段文本和几个潜在的分类选项，请输出文本内容的正确类型",
                "input": f"文本:{context},类型选型:{catagory}",
                "output": label,
            }
            messages.append(message)

    # 保存重构后的JSONL文件
    with open(new_path, "w", encoding="utf-8") as file:
        for message in messages:
            file.write(json.dumps(message, ensure_ascii=False) + "\n")
            
            
def process_func(example):
    """
    将数据集进行预处理
    """
    MAX_LENGTH = 384 
    input_ids, attention_mask, labels = [], [], []
    instruction = tokenizer(
        f"<|im_start|>system\n你是一个文本分类领域的专家，你会接收到一段文本和几个潜在的分类选项，请输出文本内容的正确类型<|im_end|>\n<|im_start|>user\n{example['input']}<|im_end|>\n<|im_start|>assistant\n",
        add_special_tokens=False,
    )
    response = tokenizer(f"{example['output']}", add_special_tokens=False)
    input_ids = instruction["input_ids"] + response["input_ids"] + [tokenizer.pad_token_id]
    attention_mask = (
        instruction["attention_mask"] + response["attention_mask"] + [1]
    )
    labels = [-100] * len(instruction["input_ids"]) + response["input_ids"] + [tokenizer.pad_token_id]
    if len(input_ids) > MAX_LENGTH:  # 做一个截断
        input_ids = input_ids[:MAX_LENGTH]
        attention_mask = attention_mask[:MAX_LENGTH]
        labels = labels[:MAX_LENGTH]
    return {"input_ids": input_ids, "attention_mask": attention_mask, "labels": labels}   

def predict(messages, model, tokenizer):
    device = "cuda"
    text = tokenizer.apply_chat_template(
        messages,
        tokenize=False,
        add_generation_prompt=True
    )
    model_inputs = tokenizer([text], return_tensors="pt").to(device)

    generated_ids = model.generate(
        model_inputs.input_ids,
        max_new_tokens=300
    )
    generated_ids = [
        output_ids[len(input_ids):] for input_ids, output_ids in zip(model_inputs.input_ids, generated_ids)
    ]
    
    response = tokenizer.batch_decode(generated_ids, skip_special_tokens=True)[0]
    
    print(response)
     
    return response
    
model='/root/autodl-tmp/qwen/Qwen2-7B-Instruct' # 指定模型路径

# Transformers加载模型权重
tokenizer = AutoTokenizer.from_pretrained(model, use_fast=False, trust_remote_code=True)
## 实例化大模型，device_map选择cpu还是gpu，torch_dtype表示模型的张量数据类型
model = AutoModelForCausalLM.from_pretrained(model, device_map="auto", torch_dtype=torch.bfloat16)
model.enable_input_require_grads()  # 开启梯度检查点时，要执行该方法

# 加载、处理数据集和测试集
train_dataset_path = "/autodl-fs/data/qwen2-test/data/train.jsonl"
test_dataset_path = "/autodl-fs/data/qwen2-test/data/test.jsonl"

train_jsonl_new_path = "/autodl-fs/data/qwen2-test/data/new_train.jsonl"
test_jsonl_new_path = "/autodl-fs/data/qwen2-test/data/new_test.jsonl"

if not os.path.exists(train_jsonl_new_path):
    dataset_jsonl_transfer(train_dataset_path, train_jsonl_new_path)
if not os.path.exists(test_jsonl_new_path):
    dataset_jsonl_transfer(test_dataset_path, test_jsonl_new_path)

# 得到训练集
train_df = pd.read_json(train_jsonl_new_path, lines=True)
train_ds = Dataset.from_pandas(train_df[0:10])
train_dataset = train_ds.map(process_func, remove_columns=train_ds.column_names) ## 对数据集进行预处理，向量化...

config = LoraConfig(
    task_type=TaskType.CAUSAL_LM,
    target_modules=["q_proj", "k_proj", "v_proj", "o_proj", "gate_proj", "up_proj", "down_proj"],
    inference_mode=False,  # 训练模式
    r=8,  # Lora 秩
    lora_alpha=32,  # Lora alaph，具体作用参见 Lora 原理
    lora_dropout=0.1,  # Dropout 比例
)

model = get_peft_model(model, config)

args = TrainingArguments(
    output_dir="./output/Qwen2-7B",
    per_device_train_batch_size=4,
    gradient_accumulation_steps=4,
    logging_steps=10,
    num_train_epochs=2,
    save_steps=100,
    learning_rate=1e-4,
    save_on_each_node=True,
    gradient_checkpointing=True,
    report_to="none",
)

swanlab_callback = SwanLabCallback(
    project="Qwen2-fintune",
    experiment_name="Qwen2-7B-Instruct",
    description="使用通义千问Qwen2-7B-Instruct模型在zh_cls_fudan-news数据集上微调。",
    config={
        "model": "qwen/Qwen2-7B-Instruct",
        "dataset": "huangjintao/zh_cls_fudan-news",
    }
)

trainer = Trainer(
    model=model,
    args=args,
    train_dataset=train_dataset,
    data_collator=DataCollatorForSeq2Seq(tokenizer=tokenizer, padding=True),
    callbacks=[swanlab_callback],
)

trainer.train()

# 用测试集的前10条，测试模型
test_df = pd.read_json(test_jsonl_new_path, lines=True)[:10]

test_text_list = []
for index, row in test_df.iterrows():
    instruction = row['instruction']
    input_value = row['input']
    
    messages = [
        {"role": "system", "content": f"{instruction}"},
        {"role": "user", "content": f"{input_value}"}
    ]

    response = predict(messages, model, tokenizer)
    messages.append({"role": "assistant", "content": f"{response}"})
    result_text = f"{messages[0]}\n\n{messages[1]}\n\n{messages[2]}"
    test_text_list.append(swanlab.Text(result_text, caption=response))
    
swanlab.log({"Prediction": test_text_list})
swanlab.finish()

这里由于数据处理的时间太久，我们只用了10条数据训练，代码通过，但是测试的时候出现内存溢出的情况，显示显存不够了，接下来我们直接申请A800试一试...