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import os, torch, gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig
from peft import PeftModel
BASE_MODEL = os.getenv("BASE_MODEL", "mistralai/Mistral-7B-Instruct-v0.2")
LORA_REPO = os.getenv("LORA_REPO", "YOUR_USERNAME/DSAN-5800-LoRA-mistral7b-r8")
HF_TOKEN = os.getenv("HF_TOKEN") # set only if repos are private
def load_model():
tok = AutoTokenizer.from_pretrained(BASE_MODEL, use_fast=True, token=HF_TOKEN)
if tok.pad_token is None and tok.eos_token is not None:
tok.pad_token = tok.eos_token; tok.padding_side = "left"
quant = BitsAndBytesConfig(load_in_4bit=True, bnb_4bit_use_double_quant=True,
bnb_4bit_quant_type="nf4", bnb_4bit_compute_dtype=torch.float16)
base = AutoModelForCausalLM.from_pretrained(BASE_MODEL, device_map="auto",
torch_dtype=torch.float16, quantization_config=quant,
token=HF_TOKEN)
model = PeftModel.from_pretrained(base, LORA_REPO, device_map="auto", token=HF_TOKEN)
model.eval()
return model, tok
model, tokenizer = load_model()
def build_prompt(instruction: str) -> str:
msgs = [{"role":"system","content":"You are a Python coding assistant. Produce correct, clean, efficient Python."},
{"role":"user","content":instruction}]
try:
return tokenizer.apply_chat_template(msgs, tokenize=False, add_generation_prompt=True)
except Exception:
return f"System: You are a Python coding assistant.\nUser: {instruction}\nAssistant:"
def infer(instruction, max_new_tokens, temperature, top_p):
prompt = build_prompt(instruction)
inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
with torch.no_grad():
out = model.generate(**inputs, do_sample=True, temperature=float(temperature),
top_p=float(top_p), max_new_tokens=int(max_new_tokens),
pad_token_id=tokenizer.eos_token_id, eos_token_id=tokenizer.eos_token_id)
text = tokenizer.decode(out[0], skip_special_tokens=True)
return text[len(prompt):].strip() if text.startswith(prompt) else text
demo = gr.Interface(
fn=infer,
inputs=[gr.Textbox(label="Instruction", lines=8),
gr.Slider(32, 2048, value=512, step=32, label="max_new_tokens"),
gr.Slider(0.0, 1.0, value=0.2, step=0.05, label="temperature"),
gr.Slider(0.1, 1.0, value=0.9, step=0.05, label="top_p")],
outputs=gr.Code(label="Model output (Python)", language="python"),
title="DSAN-5800 LoRA Demo",
description="Mistral 7B + LoRA adapter with 4-bit inference."
)
if __name__ == "__main__":
demo.launch() |