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from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel
import torch
import gradio as gr

BASE_MODEL = "meta-llama/Llama-2-7b-hf"
ADAPTER = "thangduong0509/vinallama-peft-7b-math-solver"

# Load base model
tokenizer = AutoTokenizer.from_pretrained(BASE_MODEL, trust_remote_code=True)
base_model = AutoModelForCausalLM.from_pretrained(
    BASE_MODEL,
    device_map="auto",
    torch_dtype=torch.float16,
    trust_remote_code=True
)

# Load PEFT adapter
model = PeftModel.from_pretrained(base_model, ADAPTER)
model.eval()

def solve_math(prompt):
    inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
    with torch.no_grad():
        outputs = model.generate(**inputs, max_new_tokens=128, do_sample=True, temperature=0.7)
    return tokenizer.decode(outputs[0], skip_special_tokens=True)

gr.Interface(
    fn=solve_math,
    inputs=gr.Textbox(lines=3, placeholder="Nhập đề Toán tiểu học..."),
    outputs="text",
    title="🧮 ViLLama Math Solver",
    description="Giải toán tiểu học bằng mô hình LLaMA-2 7B fine-tune với PEFT"
).launch()