import pandas as pd
from datasets import Dataset
from openmind import AutoTokenizer, AutoModelForCausalLM, TrainingArguments, Trainer
import torch
from peft import LoraConfig, TaskType, get_peft_model
from transformers import DataCollatorForSeq2Seq
from torch.utils.data import DataLoader
df = pd.read_json('code_alpaca_2k.json')
ds = Dataset.from_pandas(df)
print(len(ds))

model_path = '../Meta-Llama-3-8B-Instruct'

tokenizer = AutoTokenizer.from_pretrained(model_path, use_fast=False, trust_remote_code=True)

def process_func(example):
    MAX_LENGTH = 2048    
    input_ids, attention_mask, labels = [], [], []
    instruction = tokenizer(f"<|im_start|>system\n你是一个人工智能助手，请你根据要求回答问题。<|im_end|>\n<|im_start|>user\n{example['instruction'] + 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]  # 因为eos token咱们也是要关注的所以 补充为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
    }
tokenized_id = ds.map(process_func, remove_columns=ds.column_names)
## 加载训练模型
model = AutoModelForCausalLM.from_pretrained(model_path, device_map="auto",torch_dtype=torch.bfloat16)

config = LoraConfig(
    task_type=TaskType.CAUSAL_LM, 
    target_modules=["v_proj","k_proj","gate_proj","q_proj"],
    inference_mode=False, # 训练模式
    r=8, # Lora 秩
    lora_alpha=16, # Lora alaph，具体作用参见 Lora 原理
    lora_dropout=0.1# Dropout 比例
)

model = get_peft_model(model, config)

model.enable_input_require_grads()
lora_path = "./output/Meta-Llama-3-8B-Instruct"

args = TrainingArguments(
    output_dir=lora_path,
    overwrite_output_dir=True,
    per_device_train_batch_size=2,
    gradient_accumulation_steps=1,
    logging_steps=1,
    logging_strategy='steps',
    logging_dir = lora_path,
    num_train_epochs=5,
    logging_nan_inf_filter=True,
    save_steps=500,
    learning_rate=1e-4,
    save_strategy='steps',
    dataloader_num_workers=2,
    gradient_checkpointing=True
)

data_loader = DataLoader(tokenized_id, batch_size=args.per_device_train_batch_size, num_workers=0)

trainer = Trainer(
    model=model,
    args=args,
    train_dataset=tokenized_id,
    data_collator=DataCollatorForSeq2Seq(tokenizer=tokenizer, padding=True)
)

trainer.train()

import argparse
import torch
from openmind import pipeline, is_torch_npu_available
from openmind import AutoTokenizer, AutoModelForCausalLM
def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--model_name_or_path",
        type=str,
        help="Path to model",
        default=None,
    )
    args = parser.parse_args()
    return args
if is_torch_npu_available():
    device = "npu:0"
else:
    device = "cpu"

model_path = 'Rose/Meta-Llama-3-8B-Instruct-SFT'

tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)

model = AutoModelForCausalLM.from_pretrained(
    model_path,
    trust_remote_code=True,
    torch_dtype=torch.float16, 
    device_map="auto"
)

messages=[
    { 'role': 'user', 'content': "write a quick sort algorithm in python."}
]
inputs = tokenizer.apply_chat_template(messages, return_tensors="pt").to(model.device)
# 32021 is the id of <|EOT|> token
outputs = model.generate(inputs, max_new_tokens=512, do_sample=False, top_k=50, top_p=0.95, num_return_sequences=1, eos_token_id=32021)
print(tokenizer.decode(outputs[0][len(inputs[0]):], skip_special_tokens=True))