{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "18562384",
   "metadata": {},
   "source": [
    "# HaUI Olympic AI 2025 — NLP Colab Template\n",
    "\n",
    "**Mục tiêu:** Khung notebook end-to-end, *tuân thủ quy chế*: (1) **không** dùng dữ liệu ngoài, (2) **chỉ** fine-tune **checkpoint tiền huấn luyện tổng quát** (chưa fine-tune đúng tác vụ), (3) **không** đụng `test` cho huấn luyện/tuning, (4) tái lập hoàn toàn trên Colab/Kaggle.\n",
    "\n",
    "> **TODO trước khi chạy**: Đặt dữ liệu vào `/content/data/` theo tên file bạn dùng bên dưới (vd. `train.csv`, `dev.csv`, `test.csv`). Điều chỉnh `CFG` cho phù hợp.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "077202e5",
   "metadata": {},
   "outputs": [],
   "source": [
    "# %%capture\n",
    "# If running on fresh Colab, uncomment to install core libs\n",
    "# !pip install --upgrade pip\n",
    "# !pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu121\n",
    "# !pip install transformers==4.43.4 datasets==2.19.0 accelerate==0.33.0 evaluate==0.4.2\n",
    "# !pip install scikit-learn==1.4.2 pandas==2.2.2 numpy==1.26.4 tqdm==4.66.4 nltk==3.8.1\n",
    "\n",
    "import os, sys, platform, random, time, math, json\n",
    "import numpy as np\n",
    "import pandas as pd\n",
    "\n",
    "import torch\n",
    "from torch.utils.data import Dataset, DataLoader\n",
    "\n",
    "import transformers\n",
    "from transformers import (\n",
    "    AutoConfig, AutoTokenizer, AutoModelForSequenceClassification,\n",
    "    DataCollatorWithPadding, Trainer, TrainingArguments, set_seed\n",
    ")\n",
    "\n",
    "from sklearn.metrics import accuracy_score, f1_score, classification_report\n",
    "\n",
    "print('Python:', sys.version)\n",
    "print('PyTorch:', torch.__version__)\n",
    "print('Transformers:', transformers.__version__)\n",
    "print('CUDA available:', torch.cuda.is_available())\n",
    "if torch.cuda.is_available():\n",
    "    print('GPU:', torch.cuda.get_device_name(0))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "9b86b5c5",
   "metadata": {},
   "outputs": [],
   "source": [
    "from dataclasses import dataclass\n",
    "\n",
    "@dataclass\n",
    "class CFG:\n",
    "    model_name: str = 'xlm-roberta-base'   # base LM, pretrain tổng quát\n",
    "    num_labels: int = 2                     # <-- TODO: chỉnh theo số lớp\n",
    "    max_length: int = 256\n",
    "    train_path: str = '/content/data/train.csv'  # TODO: chỉnh đường dẫn\n",
    "    dev_path: str = '/content/data/dev.csv'      # hoặc None nếu dùng CV\n",
    "    test_path: str = '/content/data/test.csv'\n",
    "    text_col: str = 'text'                  # TODO: tên cột văn bản\n",
    "    label_col: str = 'label'                # TODO: tên cột nhãn (int 0..K-1)\n",
    "\n",
    "    seed: int = 42\n",
    "    epochs: int = 3\n",
    "    train_bs: int = 16\n",
    "    eval_bs: int = 32\n",
    "    lr: float = 2e-5\n",
    "    wd: float = 0.01\n",
    "    grad_accum: int = 1\n",
    "    fp16: bool = True\n",
    "    warmup_ratio: float = 0.06\n",
    "    logging_steps: int = 50\n",
    "    save_total_limit: int = 2\n",
    "    output_dir: str = '/content/outputs'\n",
    "    push_to_hub: bool = False  # phải tắt nếu internet whitelist hạn chế\n",
    "\n",
    "os.makedirs(CFG.output_dir, exist_ok=True)\n",
    "\n",
    "def seed_everything(seed: int):\n",
    "    set_seed(seed)\n",
    "    random.seed(seed)\n",
    "    np.random.seed(seed)\n",
    "    torch.manual_seed(seed)\n",
    "    torch.cuda.manual_seed_all(seed)\n",
    "    print(f'Seeded with {seed}')\n",
    "\n",
    "seed_everything(CFG.seed)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "6b0c3d70",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Expect CSV with at least [text_col, label_col] for train/dev; test has [text_col] (no labels).\n",
    "def read_df(path, required_cols=None):\n",
    "    df = pd.read_csv(path)\n",
    "    if required_cols:\n",
    "        for c in required_cols:\n",
    "            if c not in df.columns:\n",
    "                raise ValueError(f'Missing column {c} in {path}. Columns: {df.columns.tolist()}')\n",
    "    return df\n",
    "\n",
    "train_df = read_df(CFG.train_path, [CFG.text_col, CFG.label_col])\n",
    "dev_df = read_df(CFG.dev_path, [CFG.text_col, CFG.label_col]) if os.path.exists(CFG.dev_path) else None\n",
    "test_df = read_df(CFG.test_path, [CFG.text_col]) if os.path.exists(CFG.test_path) else None\n",
    "\n",
    "print('Train shape:', train_df.shape)\n",
    "if dev_df is not None: print('Dev shape:', dev_df.shape)\n",
    "if test_df is not None: print('Test shape:', test_df.shape)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "32c6e1f5",
   "metadata": {},
   "outputs": [],
   "source": [
    "import re\n",
    "import unicodedata\n",
    "\n",
    "# Simple normalization — adjust to match task/language\n",
    "CONTRACTIONS = {\n",
    "    \"it's\": \"it is\", \"don't\": \"do not\", \"I'm\": \"I am\", \"can't\": \"cannot\",\n",
    "    \"that's\": \"that is\", \"there's\": \"there is\", \"he's\": \"he is\", \"she's\": \"she is\",\n",
    "}\n",
    "\n",
    "def normalize_text(s: str):\n",
    "    if not isinstance(s, str):\n",
    "        return ''\n",
    "    # NFKC normalize\n",
    "    s = unicodedata.normalize('NFKC', s)\n",
    "    # expand contractions (lower-level example; consider multilingual handling)\n",
    "    tmp = []\n",
    "    for tok in s.split():\n",
    "        key = tok.lower()\n",
    "        tmp.append(CONTRACTIONS.get(key, tok))\n",
    "    s = ' '.join(tmp)\n",
    "    # collapse spaces\n",
    "    s = re.sub(r'\\s+', ' ', s).strip()\n",
    "    return s\n",
    "\n",
    "# Apply preview (do NOT overwrite original; create a processed column for tokenization)\n",
    "train_df['proc_text'] = train_df[CFG.text_col].astype(str).map(normalize_text)\n",
    "if dev_df is not None:\n",
    "    dev_df['proc_text'] = dev_df[CFG.text_col].astype(str).map(normalize_text)\n",
    "if test_df is not None:\n",
    "    test_df['proc_text'] = test_df[CFG.text_col].astype(str).map(normalize_text)\n",
    "\n",
    "train_df.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f5b0a5c4",
   "metadata": {},
   "outputs": [],
   "source": [
    "tokenizer = AutoTokenizer.from_pretrained(CFG.model_name, use_fast=True)\n",
    "\n",
    "class NLPDataset(Dataset):\n",
    "    def __init__(self, df, has_labels=True):\n",
    "        self.df = df.reset_index(drop=True)\n",
    "        self.has_labels = has_labels\n",
    "    def __len__(self):\n",
    "        return len(self.df)\n",
    "    def __getitem__(self, idx):\n",
    "        row = self.df.iloc[idx]\n",
    "        text = row['proc_text']\n",
    "        enc = tokenizer(\n",
    "            text,\n",
    "            max_length=CFG.max_length,\n",
    "            truncation=True,\n",
    "            padding=False\n",
    "        )\n",
    "        if self.has_labels:\n",
    "            enc['labels'] = int(row[CFG.label_col])\n",
    "        return {k: torch.tensor(v) for k, v in enc.items()}\n",
    "\n",
    "train_ds = NLPDataset(train_df, has_labels=True)\n",
    "dev_ds = NLPDataset(dev_df, has_labels=True) if dev_df is not None else None\n",
    "test_ds = NLPDataset(test_df, has_labels=False) if test_df is not None else None\n",
    "\n",
    "collator = DataCollatorWithPadding(tokenizer=tokenizer)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c0343b24",
   "metadata": {},
   "outputs": [],
   "source": [
    "config = AutoConfig.from_pretrained(CFG.model_name, num_labels=CFG.num_labels)\n",
    "model = AutoModelForSequenceClassification.from_pretrained(\n",
    "    CFG.model_name,\n",
    "    config=config\n",
    ")\n",
    "\n",
    "def compute_metrics(eval_pred):\n",
    "    logits, labels = eval_pred\n",
    "    preds = logits.argmax(axis=-1)\n",
    "    acc = accuracy_score(labels, preds)\n",
    "    f1m = f1_score(labels, preds, average='macro')\n",
    "    f1w = f1_score(labels, preds, average='weighted')\n",
    "    return {'accuracy': acc, 'f1_macro': f1m, 'f1_weighted': f1w}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7a8e57d0",
   "metadata": {},
   "outputs": [],
   "source": [
    "training_args = TrainingArguments(\n",
    "    output_dir=CFG.output_dir,\n",
    "    per_device_train_batch_size=CFG.train_bs,\n",
    "    per_device_eval_batch_size=CFG.eval_bs,\n",
    "    gradient_accumulation_steps=CFG.grad_accum,\n",
    "    num_train_epochs=CFG.epochs,\n",
    "    learning_rate=CFG.lr,\n",
    "    weight_decay=CFG.wd,\n",
    "    warmup_ratio=CFG.warmup_ratio,\n",
    "    evaluation_strategy='steps' if dev_df is not None else 'no',\n",
    "    save_strategy='steps' if dev_df is not None else 'epoch',\n",
    "    logging_steps=CFG.logging_steps,\n",
    "    save_total_limit=CFG.save_total_limit,\n",
    "    load_best_model_at_end=True if dev_df is not None else False,\n",
    "    metric_for_best_model='f1_macro',\n",
    "    fp16=CFG.fp16,\n",
    "    report_to=[]  # avoid online reporting\n",
    ")\n",
    "\n",
    "trainer = Trainer(\n",
    "    model=model,\n",
    "    args=training_args,\n",
    "    train_dataset=train_ds,\n",
    "    eval_dataset=dev_ds if dev_ds is not None else None,\n",
    "    tokenizer=tokenizer,\n",
    "    data_collator=collator,\n",
    "    compute_metrics=compute_metrics if dev_ds is not None else None\n",
    ")\n",
    "\n",
    "if dev_df is not None:\n",
    "    print('Starting training with eval...')\n",
    "else:\n",
    "    print('Starting training (no eval set provided; consider internal CV).')\n",
    "\n",
    "trainer.train()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "63964aac",
   "metadata": {},
   "outputs": [],
   "source": [
    "if dev_df is not None:\n",
    "    eval_res = trainer.evaluate()\n",
    "    print('Evaluation:', eval_res)\n",
    "    # Detailed report\n",
    "    preds = trainer.predict(dev_ds)\n",
    "    y_true = preds.label_ids\n",
    "    y_pred = preds.predictions.argmax(-1)\n",
    "    print(classification_report(y_true, y_pred, digits=4))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "790ceec6",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Create submission: id + prediction (adjust column names as your platform requires)\n",
    "if test_df is not None:\n",
    "    test_pred = trainer.predict(test_ds)\n",
    "    test_labels = test_pred.predictions.argmax(-1)\n",
    "    sub = pd.DataFrame({\n",
    "        'id': np.arange(len(test_labels)),\n",
    "        'prediction': test_labels\n",
    "    })\n",
    "    sub_path = os.path.join(CFG.output_dir, 'submission.csv')\n",
    "    sub.to_csv(sub_path, index=False)\n",
    "    print('Saved:', sub_path)\n",
    "    display(sub.head())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "09ccd875",
   "metadata": {},
   "outputs": [],
   "source": [
    "# %% Optional: Stratified K-Fold CV (skeleton)\n",
    "# from sklearn.model_selection import StratifiedKFold\n",
    "# skf = StratifiedKFold(n_splits=5, shuffle=True, random_state=CFG.seed)\n",
    "# oof_preds = np.zeros((len(train_df), CFG.num_labels))\n",
    "# for fold, (trn_idx, val_idx) in enumerate(skf.split(train_df, train_df[CFG.label_col])):\n",
    "#     print(f'Fold {fold+1}')\n",
    "#     trn_df = train_df.iloc[trn_idx].reset_index(drop=True)\n",
    "#     val_df = train_df.iloc[val_idx].reset_index(drop=True)\n",
    "#     # Rebuild datasets, model, trainer per fold ...\n",
    "#     # Aggregate oof_preds and evaluate macro-F1 for model selection.\n",
    "# pass"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "0e0338f2",
   "metadata": {},
   "outputs": [],
   "source": [
    "import importlib, pkgutil\n",
    "def pkg_version(name):\n",
    "    try:\n",
    "        mod = importlib.import_module(name)\n",
    "        return getattr(mod, '__version__', 'unknown')\n",
    "    except Exception:\n",
    "        return 'not-installed'\n",
    "\n",
    "print({\n",
    "    'python': sys.version,\n",
    "    'torch': pkg_version('torch'),\n",
    "    'transformers': pkg_version('transformers'),\n",
    "    'datasets': pkg_version('datasets'),\n",
    "    'accelerate': pkg_version('accelerate'),\n",
    "    'evaluate': pkg_version('evaluate'),\n",
    "    'sklearn': pkg_version('sklearn'),\n",
    "    'pandas': pkg_version('pandas'),\n",
    "    'numpy': pkg_version('numpy'),\n",
    "    'nltk': pkg_version('nltk'),\n",
    "})"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "558db3d6",
   "metadata": {},
   "source": [
    "## ✅ Submission Checklist\n",
    "\n",
    "- [ ] **Không** dùng dữ liệu ngoài BTC.\n",
    "- [ ] Checkpoint **tổng quát** (chưa fine-tune đúng tác vụ).\n",
    "- [ ] Tách `train/dev` đúng; **không** đụng `test` cho tuning.\n",
    "- [ ] Notebook chạy **end-to-end** từ đầu, tạo `submission.csv` trong `CFG.output_dir`.\n",
    "- [ ] Ghi rõ `CFG`, seed, siêu tham số, phiên bản thư viện (cell Reproducibility).\n",
    "- [ ] Thời gian chạy & VRAM phù hợp Colab/Kaggle.\n"
   ]
  }
 ],
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 "nbformat": 4,
 "nbformat_minor": 5
}