functions.py

import os

import requests
import torch
from bs4 import BeautifulSoup
from peft import PeftConfig, PeftModel
from transformers import AutoModelForCausalLM, AutoTokenizer, GenerationConfig

os.environ["CUDA_VISIBLE_DEVICES"] = "0"


generation_config = GenerationConfig(temperature=.8,
                                     top_p=0.75,
                                     top_k=40)


def extract_text(url: str):
    print(['extract_text', 'start'])
    if url is None or url.strip() == '':
        return ''
    response = requests.get(url)
    soup = BeautifulSoup(response.text, "html.parser")
    text = '\n\n'.join(map(lambda p: p.text, soup.find_all('p')))
    print(['extract_text', 'end'])
    return text


def summarize_text(text: str):
    print(['summarize_text', 'start'])
    input_text = f'<s>Instruction: Elabora un resume del siguiente texto.\nInput: {text}\nOutput: '
    batch = tokenizer(input_text, return_tensors='pt')
    print(['summarize_text', 'generating'])
    with torch.cuda.amp.autocast():
        output_tokens = model.generate(**batch,
                                       max_new_tokens=256,
                                       generation_config=generation_config
                                       )
    output = tokenizer.decode(output_tokens[0], skip_special_tokens=True)
    output = output.replace(input_text, '')
    print(['summarize_text', 'end'])
    return output


def load_model(peft_model_id):
    print(['load_model', 'start'])
    config = PeftConfig.from_pretrained(peft_model_id)
    print(['load_model', 'loading model'])
    model = AutoModelForCausalLM.from_pretrained(
        config.base_model_name_or_path, return_dict=True, load_in_8bit=True, device_map='auto')
    print(['load_model', 'loading tokenizer'])
    tokenizer = AutoTokenizer.from_pretrained(config.base_model_name_or_path)
    model = PeftModel.from_pretrained(model, peft_model_id)
    model.config.use_cache = True
    print(['load_model', 'end'])
    return model, tokenizer


model, tokenizer = load_model(
    "hackathon-somos-nlp-2023/opt-6.7b-lora-sag-t3000-v300-v2")