import torch
from transformers import AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig
from peft import PeftModel
tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen3-1.7B")
bnb_config = BitsAndBytesConfig(
load_in_4bit=True,
bnb_4bit_quant_type="nf4",
bnb_4bit_compute_dtype=torch.bfloat16,
bnb_4bit_use_double_quant=True,
)
base_model = AutoModelForCausalLM.from_pretrained(
"Qwen/Qwen3-1.7B", quantization_config=bnb_config, torch_dtype=torch.bfloat16,
)
model = PeftModel.from_pretrained(base_model, "REPO_ID_QUI")
messages = [{"role": "user", "content": "Chi sei?"}]
text = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = tokenizer(text, return_tensors="pt").to(model.device)
output = model.generate(**inputs, max_new_tokens=200, do_sample=False)
print(tokenizer.decode(output[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True))