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train.py
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import torch
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from transformers import AutoModelForCausalLM, AutoTokenizer
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from peft import LoraConfig, get_peft_model
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from datasets import load_dataset
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from transformers import TrainingArguments, Trainer
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# Load dataset (StackOverflow Python dataset as an example)
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dataset = load_dataset("stackoverflow", "python")
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# Preprocess the dataset
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def format_data(example):
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return {
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"text": f"### Question:\n{example['question']}\n### Answer:\n{example['answer']}"
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}
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dataset = dataset.map(format_data)
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# Load the Mistral-7B model and tokenizer
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model_name = "mistralai/Mistral-7B-v0.1" # or use Phi-2
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model = AutoModelForCausalLM.from_pretrained(model_name, load_in_8bit=True)
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tokenizer = AutoTokenizer.from_pretrained(model_name)
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# LoRA configuration for lightweight fine-tuning
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lora_config = LoraConfig(
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r=8,
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lora_alpha=32,
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lora_dropout=0.1,
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target_modules=["q_proj", "v_proj"]
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)
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model = get_peft_model(model, lora_config)
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# Training arguments
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training_args = TrainingArguments(
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output_dir="./tuned_model", # Directory to save the fine-tuned model
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per_device_train_batch_size=4,
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num_train_epochs=3,
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save_strategy="epoch", # Save model after each epoch
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save_total_limit=2 # Keep only the last 2 saved models
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)
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# Trainer setup
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trainer = Trainer(
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model=model,
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args=training_args,
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train_dataset=dataset["train"]
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)
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# Start the fine-tuning process
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trainer.train()
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# Save the model and tokenizer
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model.save_pretrained("./tuned_model")
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tokenizer.save_pretrained("./tuned_model")
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