{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e3be057e-8d2a-4d05-bd42-6b1dc75df5ed",
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "from pathlib import Path\n",
    "from sklearn.preprocessing import StandardScaler, MinMaxScaler"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "13ad96f5",
   "metadata": {},
   "outputs": [],
   "source": [
    "# data_path = Path(r\"~/Fahrsimulator_MSY2526_AI/model_training/xgboost/output_windowed.parquet\")\n",
    "data_path = Path(r\"~/data-paulusjafahrsimulator-gpu/first_AU_dataset/output_windowed.parquet\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "95e1a351",
   "metadata": {},
   "outputs": [],
   "source": [
    "df = pd.read_parquet(path=data_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "68afd83e",
   "metadata": {},
   "outputs": [],
   "source": [
    "subjects = df['subjectID'].unique()\n",
    "print(subjects)\n",
    "print(len(subjects))\n",
    "print(len(subjects)*0.66)\n",
    "print(len(subjects)*0.33)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "52dfd885",
   "metadata": {},
   "outputs": [],
   "source": [
    "low_all = df[\n",
    "    ((df[\"PHASE\"] == \"baseline\") |\n",
    "     ((df[\"STUDY\"] == \"n-back\") & (df[\"PHASE\"] != \"baseline\") & (df[\"LEVEL\"].isin([1, 4]))))\n",
    "]\n",
    "print(f\"low all: {low_all.shape}\")\n",
    "\n",
    "high_nback = df[\n",
    "    (df[\"STUDY\"]==\"n-back\") &\n",
    "    (df[\"LEVEL\"].isin([2, 3, 5, 6])) &\n",
    "    (df[\"PHASE\"].isin([\"train\", \"test\"]))\n",
    "]\n",
    "print(f\"high n-back: {high_nback.shape}\")\n",
    "\n",
    "high_kdrive = df[\n",
    "    (df[\"STUDY\"] == \"k-drive\") & (df[\"PHASE\"] != \"baseline\")\n",
    "]\n",
    "print(f\"high k-drive: {high_kdrive.shape}\")\n",
    "\n",
    "high_all = pd.concat([high_nback, high_kdrive])\n",
    "print(f\"high all: {high_all.shape}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8fba6edf",
   "metadata": {},
   "outputs": [],
   "source": [
    "def fit_normalizer(train_data, au_columns, method='standard', scope='global'):\n",
    "    if method == 'standard':\n",
    "        Scaler = StandardScaler\n",
    "    elif method == 'minmax':\n",
    "        Scaler = MinMaxScaler\n",
    "    else:\n",
    "        raise ValueError(\"method must be 'standard' or 'minmax'\")\n",
    "    \n",
    "    scalers = {}\n",
    "    \n",
    "    if scope == 'subject':\n",
    "        for subject in train_data['subjectID'].unique():\n",
    "            subject_mask = train_data['subjectID'] == subject\n",
    "            scaler = Scaler()\n",
    "            scaler.fit(train_data.loc[subject_mask, au_columns])\n",
    "            scalers[subject] = scaler\n",
    "\n",
    "    elif scope == 'global':\n",
    "        scaler = Scaler()\n",
    "        scaler.fit(train_data[au_columns])\n",
    "        scalers['global'] = scaler\n",
    "\n",
    "    else:\n",
    "        raise ValueError(\"scope must be 'subject' or 'global'\")\n",
    "    \n",
    "    return {'scalers': scalers, 'method': method, 'scope': scope}\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "24e3a77b",
   "metadata": {},
   "outputs": [],
   "source": [
    "%pip install xgboost"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8e7fa0fa",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "from sklearn.model_selection import train_test_split,StratifiedKFold, GridSearchCV\n",
    "from sklearn.metrics import accuracy_score, f1_score, roc_auc_score, classification_report, confusion_matrix\n",
    "import xgboost as xgb\n",
    "import joblib\n",
    "import matplotlib.pyplot as plt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "325ef71c",
   "metadata": {},
   "outputs": [],
   "source": [
    "low = low_all.copy()\n",
    "high = high_all.copy()\n",
    "\n",
    "low[\"label\"] = 0\n",
    "high[\"label\"] = 1\n",
    "\n",
    "data = pd.concat([low, high], ignore_index=True)\n",
    "data = data.drop_duplicates()\n",
    "\n",
    "print(\"Label distribution:\")\n",
    "print(data[\"label\"].value_counts())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "67d70e84",
   "metadata": {},
   "outputs": [],
   "source": [
    "au_columns = [col for col in data.columns if col.lower().startswith(\"au\")]\n",
    "print(\"Gefundene AU-Spalten:\", au_columns)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "960bb8c7",
   "metadata": {},
   "outputs": [],
   "source": [
    "subjects = np.random.permutation(data[\"subjectID\"].unique())\n",
    "\n",
    "n = len(subjects)\n",
    "n_train = int(n * 0.66)\n",
    "\n",
    "train_subjects = subjects[:n_train]\n",
    "test_subjects  = subjects[n_train:]\n",
    "train_subs, val_subs = train_test_split(train_subjects, test_size=0.2, random_state=42)\n",
    "\n",
    "train_df = data[data.subjectID.isin(train_subs)]\n",
    "val_df   = data[data.subjectID.isin(val_subs)]\n",
    "test_df  = data[data.subjectID.isin(test_subjects)]\n",
    "\n",
    "print(train_df.shape, val_df.shape, test_df.shape)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "802a45c9",
   "metadata": {},
   "outputs": [],
   "source": [
    "def apply_normalizer(df_to_transform, normalizer_dict, au_columns):\n",
    "    scalers = normalizer_dict[\"scalers\"]\n",
    "    scope = normalizer_dict[\"scope\"]\n",
    "    df_out = df_to_transform.copy()\n",
    "\n",
    "    if scope == \"global\":\n",
    "        scaler = scalers[\"global\"]\n",
    "        df_out[au_columns] = scaler.transform(df_out[au_columns])\n",
    "\n",
    "    elif scope == \"subject\":\n",
    "        for subj, subdf in df_out.groupby(\"subjectID\"):\n",
    "            if subj in scalers:\n",
    "                df_out.loc[subdf.index, au_columns] = scalers[subj].transform(subdf[au_columns])\n",
    "            elif \"global\" in scalers:\n",
    "                df_out.loc[subdf.index, au_columns] = scalers[\"global\"].transform(subdf[au_columns])\n",
    "\n",
    "    return df_out"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "dbb58abd",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import pandas as pd\n",
    "\n",
    "def calculate_mad_params(df, columns):\n",
    "    \"\"\"\n",
    "    Calculate median and MAD parameters for each column.\n",
    "    This should be run ONLY on the training data.\n",
    "    \n",
    "    Returns a dictionary: {col: (median, mad)}\n",
    "    \"\"\"\n",
    "    params = {}\n",
    "    for col in columns:\n",
    "        median = df[col].median()\n",
    "        mad = np.median(np.abs(df[col] - median))\n",
    "        params[col] = (median, mad)\n",
    "    return params\n",
    "\n",
    "def apply_mad_filter(df, params, threshold=3.5):\n",
    "    \"\"\"\n",
    "    Apply MAD-based outlier removal using precomputed parameters.\n",
    "    Works on training, validation, and test data.\n",
    "    \n",
    "    df: DataFrame to filter\n",
    "    params: dictionary {col: (median, mad)} from training data\n",
    "    threshold: cutoff for robust Z-score\n",
    "    \"\"\"\n",
    "    df_clean = df.copy()\n",
    "\n",
    "    for col, (median, mad) in params.items():\n",
    "        if mad == 0:\n",
    "            continue  # no spread; nothing to remove for this column\n",
    "\n",
    "        robust_z = 0.6745 * (df_clean[col] - median) / mad\n",
    "        outlier_mask = np.abs(robust_z) > threshold\n",
    "\n",
    "        # Remove values only in this specific column\n",
    "        df_clean.loc[outlier_mask, col] = np.nan\n",
    "        \n",
    "    return df_clean"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "0f03f1b4",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Step 1: Fit parameters on training data\n",
    "params = calculate_mad_params(train_df, au_columns)\n",
    "\n",
    "# Step 2: Apply filter consistently\n",
    "train_outlier_removed = apply_mad_filter(train_df, params, threshold=3.5)\n",
    "val_outlier_removed   = apply_mad_filter(val_df, params, threshold=50)\n",
    "test_outlier_removed  = apply_mad_filter(test_df, params, threshold=50)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "289f6b89",
   "metadata": {},
   "outputs": [],
   "source": [
    "normalizer = fit_normalizer(train_outlier_removed, au_columns, method=\"standard\", scope=\"global\")\n",
    "\n",
    "train_scaled = apply_normalizer(train_outlier_removed, normalizer, au_columns)\n",
    "val_scaled   = apply_normalizer(val_df, normalizer, au_columns)\n",
    "test_scaled  = apply_normalizer(test_df, normalizer, au_columns)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5df30e8d",
   "metadata": {},
   "outputs": [],
   "source": [
    "X_train, y_train = train_scaled[au_columns].values, train_scaled[\"label\"].values\n",
    "X_val,   y_val   = val_scaled[au_columns].values, val_scaled[\"label\"].values\n",
    "X_test,  y_test  = test_scaled[au_columns].values, test_scaled[\"label\"].values"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "6fb7c86a",
   "metadata": {},
   "outputs": [],
   "source": [
    "import matplotlib.pyplot as plt\n",
    "from sklearn.metrics import RocCurveDisplay, log_loss, accuracy_score\n",
    "early_stop = xgb.callback.EarlyStopping(\n",
    "    rounds=30, metric_name='auc', data_name='validation_0', save_best=True\n",
    ")\n",
    "\n",
    "# Basis-Modell\n",
    "xgb_clf = xgb.XGBClassifier(\n",
    "    objective=\"binary:logistic\",\n",
    "    scale_pos_weight=1100/1550,\n",
    "    eval_metric=[\"logloss\",\"auc\",\"error\"],\n",
    "    use_label_encoder=False,\n",
    "    random_state=42,\n",
    "    callbacks=[early_stop],\n",
    "    verbosity=0,\n",
    ")\n",
    "\n",
    "# Parameter-Raster\n",
    "param_grid = {\n",
    "    \"learning_rate\": [0.01, 0.02, 0.05],\n",
    "    \"max_depth\": [2, 3, 4],\n",
    "    # \"n_estimators\": [200, 500, 800],\n",
    "    \"subsample\": [0.4, 0.5],\n",
    "    \"colsample_bytree\": [0.7, 0.8],\n",
    "    \"reg_alpha\": [0, 0.1, 1, 10],           # L1 regularization\n",
    "    \"reg_lambda\": [0.5, 1, 5, 10]           # L2 regularization\n",
    "}\n",
    "\n",
    "# old values - acc 100%\n",
    "    # \"learning_rate\": [0.01, 0.05, 0.1],\n",
    "    # \"max_depth\": [4, 6, 8],\n",
    "    # \"n_estimators\": [200, 500, 800],\n",
    "    # \"subsample\": [0.8, 1.0],\n",
    "    # \"colsample_bytree\": [0.8, 1.0]\n",
    "\n",
    "# K-Fold Cross Validation\n",
    "cv = StratifiedKFold(n_splits=5, shuffle=True, random_state=42)\n",
    "\n",
    "# Grid Search Setup\n",
    "grid_search = GridSearchCV(\n",
    "    estimator=xgb_clf,\n",
    "    param_grid=param_grid,\n",
    "    scoring=\"roc_auc\",\n",
    "    n_jobs=-1,\n",
    "    cv=cv,\n",
    "    verbose=0\n",
    ")\n",
    "\n",
    "# Training mit Cross Validation\n",
    "grid_search.fit(\n",
    "    X_train, y_train,\n",
    "    eval_set=[(X_train, y_train), (X_val, y_val)],\n",
    "    verbose=False,\n",
    ")\n",
    "\n",
    "print(\"Beste Parameter:\", grid_search.best_params_)\n",
    "print(\"Bestes AUC:\", grid_search.best_score_)\n",
    "\n",
    "# Bestes Modell extrahieren\n",
    "model = grid_search.best_estimator_"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "d2681022",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Plots\n",
    "\n",
    "results = model.evals_result()\n",
    "epochs = len(results['validation_0']['auc'])\n",
    "x_axis = range(0, epochs)\n",
    "\n",
    "# --- Plot Loss ---\n",
    "plt.figure(figsize=(8,6))\n",
    "plt.plot(x_axis, results['validation_0']['logloss'], label='Validation Loss')\n",
    "plt.plot(x_axis, results['validation_1']['logloss'], label='Training Loss')\n",
    "plt.legend()\n",
    "plt.xlabel('Epochs')\n",
    "plt.ylabel('Logloss')\n",
    "plt.title('XGBoost Loss during Training')\n",
    "plt.grid(True)\n",
    "plt.show()\n",
    "\n",
    "# --- Plot Accuracy ---\n",
    "plt.figure(figsize=(8,6))\n",
    "plt.plot(x_axis, [1-e for e in results['validation_0']['error']], label='Validation Accuracy')\n",
    "plt.plot(x_axis, [1-e for e in results['validation_1']['error']], label='Training Accuracy')\n",
    "plt.legend()\n",
    "plt.xlabel('Epochs')\n",
    "plt.ylabel('Accuracy')\n",
    "plt.title('XGBoost Accuracy during Training')\n",
    "plt.grid(True)\n",
    "plt.show()\n",
    "\n",
    "# Plot AUC\n",
    "\n",
    "plt.figure(figsize=(8,6))\n",
    "plt.plot(x_axis, results['validation_0']['auc'], label='Validation AUC')\n",
    "plt.plot(x_axis, results['validation_0']['auc'], marker='o')\n",
    "plt.legend()\n",
    "plt.xlabel('Epochs')\n",
    "plt.ylabel('AUC')\n",
    "plt.title('XGBoost AUC during Training')\n",
    "plt.grid(True)\n",
    "plt.show()\n",
    "\n",
    "# ROC-Kurve plotten\n",
    "y_pred_proba = model.predict_proba(X_val)[:, 1]\n",
    "RocCurveDisplay.from_predictions(y_val, y_pred_proba)\n",
    "plt.title(\"ROC Curve (Validation Set)\")\n",
    "plt.grid(True)\n",
    "plt.show()\n",
    "\n",
    "# Test: Loss und Accuracy\n",
    "y_test_proba = model.predict_proba(X_test)[:,1]\n",
    "y_test_pred = (y_test_proba > 0.5).astype(int)\n",
    "\n",
    "print(\"Test Loss:\", log_loss(y_test, y_test_proba))\n",
    "print(\"Test Accuracy:\", accuracy_score(y_test, y_test_pred))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "09a8cd21",
   "metadata": {},
   "outputs": [],
   "source": [
    "from sklearn.metrics import confusion_matrix, accuracy_score, f1_score, roc_auc_score, classification_report, ConfusionMatrixDisplay\n",
    "\n",
    "def evaluate(model, X, y, title=\"Evaluation\"):\n",
    "    # Vorhersagen\n",
    "    preds_proba = model.predict_proba(X)[:, 1]\n",
    "    preds = (preds_proba > 0.5).astype(int)\n",
    "\n",
    "    # Metriken ausgeben\n",
    "    print(\"Accuracy:\", accuracy_score(y, preds))\n",
    "    print(\"F1:\", f1_score(y, preds))\n",
    "    print(\"AUC:\", roc_auc_score(y, preds))\n",
    "    print(\"Confusion:\\n\", confusion_matrix(y, preds))\n",
    "    print(classification_report(y, preds))\n",
    "\n",
    "    # Confusion Matrix plotten\n",
    "    def plot_confusion_matrix(true_labels, predictions, label_names):\n",
    "        for normalize in [None, 'true']:\n",
    "            cm = confusion_matrix(true_labels, predictions, normalize=normalize)\n",
    "            cm_disp = ConfusionMatrixDisplay(cm,  display_labels=label_names)\n",
    "            cm_disp.plot(cmap=\"Blues\")\n",
    "    #cm = confusion_matrix(y, preds)\n",
    "    plot_confusion_matrix(y,preds, label_names=['Low','High'])\n",
    "    # plt.figure(figsize=(5,4))\n",
    "    # sns.heatmap(cm, annot=True, fmt=\"d\", cmap=\"Blues\", cbar=False,\n",
    "    #             xticklabels=[\"Predicted low\", \"Predicted high\"],\n",
    "    #             yticklabels=[\"Actual low\", \"Actual high\"])\n",
    "    # plt.title(f\"Confusion Matrix - {title}\")\n",
    "    # plt.ylabel(\"True label\")\n",
    "    # plt.xlabel(\"Predicted label\")\n",
    "    # plt.show()\n",
    "\n",
    "# Aufrufen für Train/Val/Test\n",
    "print(\"TRAIN:\")\n",
    "evaluate(model, X_train, y_train, title=\"Train\")\n",
    "\n",
    "print(\"VAL:\")\n",
    "evaluate(model, X_val, y_val, title=\"Validation\")\n",
    "\n",
    "print(\"TEST:\")\n",
    "evaluate(model, X_test, y_test, title=\"Test\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c43b0c80",
   "metadata": {},
   "outputs": [],
   "source": [
    "joblib.dump(model, \"xgb_model_with_MAD.joblib\")\n",
    "joblib.dump(normalizer, \"normalizer_with_MAD.joblib\")\n",
    "print(\"Model gespeichert.\")\n",
    "\n",
    "model.save_model(\"xgb_model_with_MAD.json\")   # als JSON (lesbar, portabel)\n",
    "model.save_model(\"xgb_model_with_MAD.bin\")    # als Binärdatei (kompakt)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "3195cc84",
   "metadata": {},
   "outputs": [],
   "source": [
    "import os\n",
    "os.getcwd()\n",
    "\n"
   ]
  }
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