train_classifier.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "27933625-f946-4fce-a622-e92ea518fad1",
   "metadata": {
    "jp-MarkdownHeadingCollapsed": true
   },
   "source": [
    "## 1. Mandatory"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8674dce1-4885-4bc9-8b90-1d847c38e6f1",
   "metadata": {},
   "outputs": [],
   "source": [
    "from sklearn.metrics import precision_recall_fscore_support, confusion_matrix, accuracy_score\n",
    "from torch.utils.data import TensorDataset, DataLoader\n",
    "from sklearn.model_selection import train_test_split\n",
    "\n",
    "import matplotlib.pyplot as plt\n",
    "import torch.optim as optim\n",
    "import torch.nn as nn\n",
    "import seaborn as sns\n",
    "import numpy as np\n",
    "import torch\n",
    "import json\n",
    "import os"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "46a4597f",
   "metadata": {},
   "source": [
    "# 2. Complete below - if you did not download DINOv2 cls-tokens together with the labels - Skip to step 3 if done."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1f1bd72b-ed98-4669-908c-2b103bcacda5",
   "metadata": {},
   "source": [
    "## Load labels"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "98e09803-9862-4e29-aaff-3bdcd4e0fe53",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Paths to labels\n",
    "path_to_labels = '/home/evan/D1/project/code/start_end_labels'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b41d5fd2-ee4a-4f02-98b9-887e48115c47",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Should be 425 files, code just to verify\n",
    "num_of_labels = 0\n",
    "for ind, label in enumerate(os.listdir(path_to_labels)):\n",
    "    num_of_labels = ind+1\n",
    "\n",
    "num_of_labels"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "1ef791d8-a268-4436-ad18-150d645bef73",
   "metadata": {},
   "outputs": [],
   "source": [
    "list_of_labels = []\n",
    "\n",
    "categorical_mapping = {'background': 0, 'tackle-live': 1, 'tackle-replay': 2, 'tackle-live-incomplete': 3, 'tackle-replay-incomplete': 4}\n",
    "\n",
    "# Sort to make sure order is maintained\n",
    "for ind, label in enumerate(sorted(os.listdir(path_to_labels))):\n",
    "    full_path = os.path.join(path_to_labels, label)\n",
    "\n",
    "    with open(full_path, 'r') as file:\n",
    "        data = json.load(file)\n",
    "        \n",
    "        # Extract frame count\n",
    "        frame_count = data['media_attributes']['frame_count']\n",
    "\n",
    "        # Extract tackles\n",
    "        tackles = data['events']\n",
    "        \n",
    "        labels_of_current_file = np.zeros(frame_count)\n",
    "    \n",
    "        for tackle in tackles:\n",
    "            # Extract variables\n",
    "            tackle_class = tackle['type']\n",
    "            start_frame = tackle['frame_start']\n",
    "            end_frame = tackle['frame_end']\n",
    "\n",
    "            # Need to shift start_frame with -1 as array-indexing starts at 0, while \n",
    "            # frame count starts at 1\n",
    "            for i in range(start_frame-1, end_frame, 1):\n",
    "                labels_of_current_file[i] = categorical_mapping[tackle_class]\n",
    "\n",
    "        list_of_labels.append(labels_of_current_file)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b302d94a-d18c-4e41-929b-3c8f4d547afa",
   "metadata": {},
   "source": [
    "## Verify that change is correct"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "286b27a8-1c9a-4ba9-9996-deeef7927195",
   "metadata": {},
   "outputs": [],
   "source": [
    "test = list_of_labels[0]\n",
    "\n",
    "for i in range(len(test)):\n",
    "    # Should give [0,1,1,0] as 181-107 is the actual sequence, but its moved to 180-206 with array indexing\n",
    "    # starting from 0 instead of 1 like the frame counting.\n",
    "    if i == 179 or i == 180 or i == 206 or i == 207:\n",
    "        print(test[i])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "88650952-a098-4ae3-ba3b-d67f5d17c41b",
   "metadata": {},
   "source": [
    "## Map incomplete class-labels to instances of their respective 'full-class'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "2c48db00-b367-4f38-aa59-de5164d11fe9",
   "metadata": {},
   "outputs": [],
   "source": [
    "class_mapping = {0:0, 1: 1, 2: 2, 3: 1, 4: 2}\n",
    "prev_list_of_labels = list_of_labels\n",
    "\n",
    "for i, label in enumerate(list_of_labels):\n",
    "    list_of_labels[i] = np.array([class_mapping[frame_class] for frame_class in label])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ee69c1f0-db9d-4848-9b3c-2556e09d1991",
   "metadata": {},
   "source": [
    "## Load DINOv2-features and extract CLS-tokens"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "20b2ee27-5d94-4301-9229-aa9486360a73",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Define path to DINOv2-features\n",
    "path_to_tensors = '/home/evan/D1/project/code/processed_features/last_hidden_states'\n",
    "path_to_first_tensor = '/home/evan/D1/project/code/processed_features/last_hidden_states/1738_avxeiaxxw6ocr.pt'\n",
    "\n",
    "all_cls_tokens = torch.load(path_to_first_tensor)[:,0,:]\n",
    "\n",
    "for index, tensor_file in enumerate(sorted(os.listdir(path_to_tensors))[1:]):  # Start from the second item\n",
    "    full_path = os.path.join(path_to_tensors, tensor_file)\n",
    "    cls_token = torch.load(full_path)[:,0,:]\n",
    "    all_cls_tokens = torch.cat((all_cls_tokens, cls_token), dim=0)\n",
    "\n",
    "\n",
    "# Should have shape: total_frames, feature_vector (1024)\n",
    "print('CLS tokens shape: ', all_cls_tokens.shape)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "03c8f5ed-5b04-456d-a9fd-8d493878ea18",
   "metadata": {},
   "source": [
    "### Reshape labels list"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c9bc68a4-5c33-43b6-a9e1-febb035ea2fb",
   "metadata": {},
   "outputs": [],
   "source": [
    "all_labels_concatenated = np.concatenate(list_of_labels, axis=0)\n",
    "\n",
    "# Length should be total number of frames\n",
    "print('Length of all labels concatenated: ', len(all_labels_concatenated))\n",
    "\n",
    "\n",
    "\n",
    "# Map imcomplete instances to complete ones. As this approach only looks at 'background', 'tackle-live' and 'tackle-replay',\n",
    "# the incomplete classes can be mapped to their respective others due to a single frame being part of the tackle whatsoever.\n",
    "class_mapping = {0:0, 1: 1, 2: 2, 3: 1, 4: 2}\n",
    "\n",
    "for i, label in enumerate(all_labels_concatenated):\n",
    "    all_labels_concatenated[i] = class_mapping[label]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f644964d",
   "metadata": {},
   "source": [
    "# 3. If you downloaded the DINOv2 cls-tokens together with the labels, follow below:"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ab5f971c",
   "metadata": {},
   "source": [
    "The next cell can be skipped if you completed step 1."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5e2600aa",
   "metadata": {},
   "outputs": [],
   "source": [
    "\n",
    "# Place the path to your cls tokens and labels downloaded below:\n",
    "cls_path = '/home/evan/D1/project/code/full_concat_dino_features.pt'\n",
    "labels_path = '/home/evan/D1/project/code/all_labels_concatenated.npy'\n",
    "\n",
    "all_cls_tokens = torch.load(cls_path)\n",
    "all_labels_concatenated = np.load(labels_path)\n",
    "\n",
    "# Map imcomplete instances to complete ones. As this approach only looks at 'background', 'tackle-live' and 'tackle-replay',\n",
    "# the incomplete classes can be mapped to their respective others due to a single frame being part of the tackle whatsoever.\n",
    "class_mapping = {0:0, 1: 1, 2: 2, 3: 1, 4: 2}\n",
    "\n",
    "for i, label in enumerate(all_labels_concatenated):\n",
    "    all_labels_concatenated[i] = class_mapping[label]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "01b360a4",
   "metadata": {},
   "source": [
    "# 4. Follow below  "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e4561d68-a149-4a00-9a7d-e0e69bbcfa53",
   "metadata": {},
   "source": [
    "## Balance classes"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "68e2e245-36d3-464e-85ae-6d5f30ebe164",
   "metadata": {},
   "source": [
    "### Move cls-tokens to CPU"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "61b8a9fe-d3ac-4d6c-b0a9-5c32a2593495",
   "metadata": {},
   "outputs": [],
   "source": [
    "all_cls_tokens = np.array([e.cpu().numpy() for e in all_cls_tokens])\n",
    "print('Tensor shape after reshaping: ', all_cls_tokens.shape)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b6074527-9ddc-4b9e-b933-a6c5af9cd134",
   "metadata": {},
   "source": [
    "### Verify that order is correct"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ea1425ae-6588-4c71-8a08-7f9c0adc7422",
   "metadata": {},
   "outputs": [],
   "source": [
    "for i in range(len(all_labels_concatenated)):\n",
    "    # Should give [0,1,1,0] as 181-107 is the actual sequence, but its moved to 180-206 with array indexing\n",
    "    # starting from 0 instead of 1 like the frame counting.\n",
    "    if i == 179 or i == 180 or i == 206 or i == 207:\n",
    "        print(all_labels_concatenated[i])\n",
    "\n",
    "    if i > 210:\n",
    "        break"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6e851954-e2d7-41fd-956f-92df09a79e8b",
   "metadata": {},
   "source": [
    "### Class for balancing distribution of classes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "479daf78-11c0-4ded-9bb3-8fa34d12c6d7",
   "metadata": {},
   "outputs": [],
   "source": [
    "def balance_classes(X, y):\n",
    "    unique, counts = np.unique(y, return_counts=True)\n",
    "    min_samples = counts.min()\n",
    "    # Calculate 2.0 times the minimum sample size, rounded down to the nearest integer\n",
    "    # target_samples = int(2.0 * min_samples)\n",
    "    target_samples = 5000\n",
    "    \n",
    "    indices_to_keep = np.hstack([\n",
    "        np.random.choice(\n",
    "            np.where(y == label)[0], \n",
    "            min(target_samples, counts[unique.tolist().index(label)]),  # Ensure not to exceed the actual count\n",
    "            replace=False\n",
    "        ) for label in unique\n",
    "    ])\n",
    "    \n",
    "    return X[indices_to_keep], y[indices_to_keep]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6cf24d79-27d7-499e-b856-e58938cef5e7",
   "metadata": {},
   "source": [
    "### Split into train and test, without shuffle to remain order"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "9c9fbaec-2849-48d0-867d-e0ad39682135",
   "metadata": {},
   "outputs": [],
   "source": [
    "X_train, X_test, y_train, y_test = train_test_split(all_cls_tokens, all_labels_concatenated, test_size=0.2, shuffle=False, stratify=None)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "35fa46bb-258a-4b6e-a8c0-56c47c791d55",
   "metadata": {},
   "outputs": [],
   "source": [
    "X_train_balanced, y_train_balanced = balance_classes(X_train, y_train)\n",
    "X_test_balanced, y_test_balanced = balance_classes(X_test, y_test)\n",
    "print(\"Total number of samples:\", len(all_labels_concatenated))\n",
    "print(\"\")\n",
    "\n",
    "print('Total distribution of labels: \\n', np.unique(all_labels_concatenated, return_counts=True))\n",
    "print(\"\")\n",
    "\n",
    "\n",
    "print('Distribution within training set: \\n', np.unique(y_train_balanced, return_counts=True))\n",
    "print(\"\")\n",
    "\n",
    "print('Distribution within test set: \\n', np.unique(y_test_balanced, return_counts=True))\n",
    "print(\"\")\n",
    "\n",
    "\n",
    "print('Training shape: ', X_train_balanced.shape, y_train_balanced.shape)\n",
    "print(\"\")\n",
    "\n",
    "print('Test shape: ', X_test_balanced.shape, y_test_balanced.shape)\n",
    "print(\"\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5b6bf3b4-5d67-41b4-9c6b-8d02d3923366",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Convert data to torch tensors\n",
    "X_train = torch.tensor(X_train_balanced, dtype=torch.float32)\n",
    "y_train = torch.tensor(y_train_balanced, dtype=torch.long)\n",
    "X_test = torch.tensor(X_test_balanced, dtype=torch.float32)\n",
    "y_test = torch.tensor(y_test_balanced, dtype=torch.long)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7d7250f4-c820-4c00-9bde-77bdc3cdd2e2",
   "metadata": {},
   "source": [
    "## Create dataset and Dataloaders"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "532583ed-65e9-4339-b94d-6cdb704c0ed7",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Create data loaders\n",
    "batch_size = 64\n",
    "train_dataset = TensorDataset(X_train, y_train)\n",
    "train_loader = DataLoader(train_dataset, batch_size=batch_size, shuffle=True)\n",
    "\n",
    "test_dataset = TensorDataset(X_test, y_test)\n",
    "test_loader = DataLoader(test_dataset, batch_size=batch_size, shuffle=False)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5ef7b5d4-04e1-4c2e-9476-2537a6785893",
   "metadata": {},
   "source": [
    "## Model class"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "d7120ab9-c016-4eba-9588-77afde98a639",
   "metadata": {},
   "outputs": [],
   "source": [
    "import torch.nn as nn\n",
    "import torch.nn.functional as F\n",
    "\n",
    "class MultiLayerClassifier(nn.Module):\n",
    "    def __init__(self, input_size, num_classes):\n",
    "        super(MultiLayerClassifier, self).__init__()\n",
    "        \n",
    "        self.fc1 = nn.Linear(input_size, 128, bias=True)\n",
    "        self.dropout1 = nn.Dropout(0.5) \n",
    "        \n",
    "        # self.fc2 = nn.Linear(512, 128)\n",
    "        # self.dropout2 = nn.Dropout(0.5)\n",
    "        \n",
    "        self.fc3 = nn.Linear(128, num_classes, bias=True)\n",
    "    \n",
    "    def forward(self, x):\n",
    "        x = F.relu(self.fc1(x))\n",
    "        x = self.dropout1(x)\n",
    "        # x = F.relu(self.fc2(x))\n",
    "        # x = self.dropout2(x)\n",
    "        x = self.fc3(x)\n",
    "        \n",
    "        return x\n",
    "\n",
    "model = MultiLayerClassifier(1024, 3)\n",
    "model"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5b0ba056-0a73-466f-b65e-a3261e1a69f1",
   "metadata": {},
   "source": [
    "## L1-regularization class"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ebd6211c-fc94-4557-947b-5a3fac89c1ba",
   "metadata": {},
   "outputs": [],
   "source": [
    "def l1_regularization(model, lambda_l1):\n",
    "    l1_penalty = torch.tensor(0.)  # Ensure the penalty is on the same device as model parameters\n",
    "    for param in model.parameters():\n",
    "        l1_penalty += torch.norm(param, 1)\n",
    "    return lambda_l1 * l1_penalty"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "00735f1f-2bf9-4aae-90c2-61e44973f699",
   "metadata": {},
   "source": [
    "## Loss, optimizer and L1-strength initialization"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c4efe9d8-fc72-4701-a1a9-d463c6b33dfa",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Loss and optimizer\n",
    "criterion = nn.CrossEntropyLoss()\n",
    "optimizer = optim.Adam(model.parameters(), lr=0.0001, weight_decay=1e-5) \n",
    "lambda_l1 = 1e-3  # L1 regularization strength"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e87f7513-47d0-491e-9073-9289eda1b484",
   "metadata": {},
   "source": [
    "## Training loop"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "4260c3bc-25c2-48f0-b79c-b6d7cc0c14eb",
   "metadata": {},
   "outputs": [],
   "source": [
    "epochs = 50\n",
    "train_losses, test_losses = [], []\n",
    "\n",
    "for epoch in range(epochs):\n",
    "    model.train()\n",
    "    train_loss = 0\n",
    "    for X_batch, y_batch in train_loader:\n",
    "        optimizer.zero_grad()\n",
    "        outputs = model(X_batch)\n",
    "        loss = criterion(outputs, y_batch)\n",
    "\n",
    "        # Calculate L1 regularization penalty\n",
    "        l1_penalty = l1_regularization(model, lambda_l1)\n",
    "        \n",
    "        # Add L1 penalty to the loss\n",
    "        loss += l1_penalty\n",
    "        \n",
    "        loss.backward()\n",
    "        optimizer.step()\n",
    "        train_loss += loss.item()\n",
    "    train_losses.append(train_loss / len(train_loader))\n",
    "\n",
    "    model.eval()\n",
    "    test_loss = 0\n",
    "    all_preds, all_targets, all_outputs = [], [], []\n",
    "    with torch.no_grad():\n",
    "        for X_batch, y_batch in test_loader:\n",
    "            outputs = model(X_batch)\n",
    "            loss = criterion(outputs, y_batch)\n",
    "            test_loss += loss.item()\n",
    "            _, predicted = torch.max(outputs.data, 1)\n",
    "            all_preds.extend(predicted.numpy())\n",
    "            all_targets.extend(y_batch.numpy())\n",
    "            all_outputs.extend(outputs.numpy())\n",
    "    test_losses.append(test_loss / len(test_loader))\n",
    "    \n",
    "    precision, recall, f1, _ = precision_recall_fscore_support(all_targets, all_preds, average='weighted', zero_division=0)\n",
    "    accuracy = accuracy_score(all_targets, all_preds)  # Compute accuracy\n",
    "    if epoch % 10==0:\n",
    "        print(f'Epoch {epoch+1}: Train Loss: {train_losses[-1]:.4f}, Test Loss: {test_losses[-1]:.4f}, Precision: {precision:.4f}, Recall: {recall:.4f}, F1: {f1:.4f}, Accuracy: {accuracy:.4f}')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "615f685e-fb19-46f8-afba-b76fb730ed49",
   "metadata": {},
   "source": [
    "## Train- vs Test-loss graph"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "597b4570-1579-470e-8f11-f72b7b04b816",
   "metadata": {},
   "outputs": [],
   "source": [
    "plt.plot(train_losses, label='Train Loss')\n",
    "plt.plot(test_losses, label='Test Loss')\n",
    "plt.legend()\n",
    "plt.title('Train vs Test Loss')\n",
    "plt.xlabel('Epoch')\n",
    "plt.ylabel('Loss')\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1babe3bd-da5b-4f0d-9d83-9ca4d73922c5",
   "metadata": {},
   "source": [
    "## Confusion matrix"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "2c0b0fa3-814e-474c-bbe1-31152305e17b",
   "metadata": {},
   "outputs": [],
   "source": [
    "conf_matrix = confusion_matrix(all_targets, all_preds)\n",
    "labels = [\"background\", \"tackle-live\", \"tackle-replay\",]\n",
    "          # \"tackle-live-incomplete\", \"tackle-replay-incomplete\"]\n",
    "sns.heatmap(conf_matrix, annot=True, fmt='d', cmap='Blues', xticklabels=labels, yticklabels=labels)\n",
    "# plt.title('Confusion Matrix')\n",
    "plt.xlabel('Predicted Label')\n",
    "plt.ylabel('True Label')\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "480ddfd5-6ac4-46ed-92db-b556c8bfbd7d",
   "metadata": {},
   "source": [
    "## ROC Curve"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ddc52d39-7612-43ad-ae44-345119122112",
   "metadata": {},
   "outputs": [],
   "source": [
    "from sklearn.metrics import roc_curve, auc\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "y_score= np.array(all_outputs)\n",
    "fpr = dict()\n",
    "tpr = dict()\n",
    "roc_auc = dict()\n",
    "n_classes = len(labels) \n",
    "\n",
    "y_test_one_hot = np.eye(n_classes)[y_test]\n",
    "\n",
    "for i in range(n_classes):\n",
    "    fpr[i], tpr[i], _ = roc_curve(y_test_one_hot[:, i], y_score[:, i])\n",
    "    roc_auc[i] = auc(fpr[i], tpr[i])\n",
    "\n",
    "# Plot all ROC curves\n",
    "plt.figure()\n",
    "colors = ['blue', 'red', 'green', 'darkorange', 'purple']\n",
    "for i, color in zip(range(n_classes), colors):\n",
    "    plt.plot(fpr[i], tpr[i], color=color, lw=2,\n",
    "             label='ROC curve of class {0} (area = {1:0.2f})'\n",
    "             ''.format(labels[i], roc_auc[i]))\n",
    "\n",
    "plt.plot([0, 1], [0, 1], 'k--', lw=2)\n",
    "plt.xlim([0.0, 1.0])\n",
    "plt.ylim([0.0, 1.05])\n",
    "plt.xlabel('False Positive Rate')\n",
    "plt.ylabel('True Positive Rate')\n",
    "print('Receiver operating characteristic for multi-class')\n",
    "plt.legend(loc=\"lower right\")\n",
    "plt.show()\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "45c05c14-99d8-49e6-ad64-7e6ad565c0ca",
   "metadata": {},
   "source": [
    "## Multi-Class Precision-Recall Cruve"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "3c779274-252f-4248-bf57-a07c665c618c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from sklearn.metrics import precision_recall_curve\n",
    "from sklearn.preprocessing import label_binarize\n",
    "from itertools import cycle\n",
    "\n",
    "y_test_bin = label_binarize(y_test, classes=range(n_classes))\n",
    "\n",
    "precision_recall = {}\n",
    "\n",
    "for i in range(n_classes):\n",
    "    precision, recall, _ = precision_recall_curve(y_test_bin[:, i], y_score[:, i])\n",
    "    precision_recall[i] = (precision, recall)\n",
    "\n",
    "colors = cycle(['navy', 'turquoise', 'darkorange', 'cornflowerblue', 'teal'])\n",
    "\n",
    "plt.figure(figsize=(6, 4))\n",
    "\n",
    "for i, color in zip(range(n_classes), colors):\n",
    "    precision, recall = precision_recall[i]\n",
    "    plt.plot(recall, precision, color=color, lw=2, label=f'{labels[i]}')\n",
    "\n",
    "plt.xlabel('Recall')\n",
    "plt.ylabel('Precision')\n",
    "print('Multi-Class Precision-Recall Curve')\n",
    "plt.legend(loc='best')\n",
    "plt.show()"
   ]
  }
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