{"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"pygments_lexer":"ipython3","nbconvert_exporter":"python","version":"3.6.4","file_extension":".py","codemirror_mode":{"name":"ipython","version":3},"name":"python","mimetype":"text/x-python"}},"nbformat_minor":4,"nbformat":4,"cells":[{"cell_type":"markdown","source":"# About this notebook  \n- PyTorch resnext50_32x4d starter code  \n- StratifiedKFold 5 folds  \n\nIf this notebook is helpful, feel free to upvote :)","metadata":{}},{"cell_type":"markdown","source":"# Data Loading","metadata":{}},{"cell_type":"code","source":"import os\n\nimport pandas as pd\n\nfrom matplotlib import pyplot as plt\nimport seaborn as sns","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:55:07.071248Z","iopub.execute_input":"2021-10-11T13:55:07.071684Z","iopub.status.idle":"2021-10-11T13:55:07.076898Z","shell.execute_reply.started":"2021-10-11T13:55:07.071647Z","shell.execute_reply":"2021-10-11T13:55:07.075612Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"os.listdir('../input/cassava-leaf-disease-classification')","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:55:12.167167Z","iopub.execute_input":"2021-10-11T13:55:12.167763Z","iopub.status.idle":"2021-10-11T13:55:12.178937Z","shell.execute_reply.started":"2021-10-11T13:55:12.167726Z","shell.execute_reply":"2021-10-11T13:55:12.178027Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"train = pd.read_csv('../input/cassava-leaf-disease-classification/train.csv')\ntest = pd.read_csv('../input/cassava-leaf-disease-classification/sample_submission.csv')\nlabel_map = pd.read_json('../input/cassava-leaf-disease-classification/label_num_to_disease_map.json', \n                         orient='index')\ndisplay(train.head())\ndisplay(test.head())\ndisplay(label_map)","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:55:21.3883Z","iopub.execute_input":"2021-10-11T13:55:21.388847Z","iopub.status.idle":"2021-10-11T13:55:22.067107Z","shell.execute_reply.started":"2021-10-11T13:55:21.388812Z","shell.execute_reply":"2021-10-11T13:55:22.065585Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"sns.distplot(train['label'], kde=False)","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:07.833667Z","iopub.execute_input":"2021-10-11T13:19:07.834012Z","iopub.status.idle":"2021-10-11T13:19:08.146996Z","shell.execute_reply.started":"2021-10-11T13:19:07.833965Z","shell.execute_reply":"2021-10-11T13:19:08.146292Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Directory settings","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Directory settings\n# ====================================================\nimport os\n\nOUTPUT_DIR = './'\nif not os.path.exists(OUTPUT_DIR):\n    os.makedirs(OUTPUT_DIR)\n\nTRAIN_PATH = '../input/cassava-leaf-disease-classification/train_images'\nTEST_PATH = '../input/cassava-leaf-disease-classification/test_images'","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:13.165582Z","iopub.execute_input":"2021-10-11T13:19:13.165912Z","iopub.status.idle":"2021-10-11T13:19:13.171349Z","shell.execute_reply.started":"2021-10-11T13:19:13.165879Z","shell.execute_reply":"2021-10-11T13:19:13.170081Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# CFG","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# CFG\n# ====================================================\nclass CFG:\n    debug=False\n    apex=False\n    print_freq=100\n    num_workers=4\n    model_name='resnext50_32x4d'\n    size=256\n    scheduler='CosineAnnealingWarmRestarts' # ['ReduceLROnPlateau', 'CosineAnnealingLR', 'CosineAnnealingWarmRestarts']\n    epochs=10\n    #factor=0.2 # ReduceLROnPlateau\n    #patience=4 # ReduceLROnPlateau\n    #eps=1e-6 # ReduceLROnPlateau\n    #T_max=10 # CosineAnnealingLR\n    T_0=10 # CosineAnnealingWarmRestarts\n    lr=1e-4\n    min_lr=1e-6\n    batch_size=32\n    weight_decay=1e-6\n    gradient_accumulation_steps=1\n    max_grad_norm=1000\n    seed=42\n    target_size=5\n    target_col='label'\n    n_fold=5\n    trn_fold=[0, 1, 2, 3, 4]\n    train=True\n    inference=False\n    \nif CFG.debug:\n    CFG.epochs = 1\n    train = train.sample(n=1000, random_state=CFG.seed).reset_index(drop=True)","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:15.542736Z","iopub.execute_input":"2021-10-11T13:19:15.543096Z","iopub.status.idle":"2021-10-11T13:19:15.553601Z","shell.execute_reply.started":"2021-10-11T13:19:15.543059Z","shell.execute_reply":"2021-10-11T13:19:15.552624Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Library","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Library\n# ====================================================\nimport sys\nsys.path.append('../input/pytorch-image-models/pytorch-image-models-master')\n\nimport os\nimport math\nimport time\nimport random\nimport shutil\nfrom pathlib import Path\nfrom contextlib import contextmanager\nfrom collections import defaultdict, Counter\n\nimport scipy as sp\nimport numpy as np\nimport pandas as pd\n\nfrom sklearn import preprocessing\nfrom sklearn.metrics import accuracy_score\nfrom sklearn.model_selection import StratifiedKFold\n\nfrom tqdm.auto import tqdm\nfrom functools import partial\n\nimport cv2\nfrom PIL import Image\n\nimport torch\nimport torch.nn as nn\nimport torch.nn.functional as F\nfrom torch.optim import Adam, SGD\nimport torchvision.models as models\nfrom torch.nn.parameter import Parameter\nfrom torch.utils.data import DataLoader, Dataset\nfrom torch.optim.lr_scheduler import CosineAnnealingWarmRestarts, CosineAnnealingLR, ReduceLROnPlateau\n\nfrom albumentations import (\n    Compose, OneOf, Normalize, Resize, RandomResizedCrop, RandomCrop, HorizontalFlip, VerticalFlip, \n    RandomBrightness, RandomContrast, RandomBrightnessContrast, Rotate, ShiftScaleRotate, Cutout, \n    IAAAdditiveGaussianNoise, Transpose\n    )\nfrom albumentations.pytorch import ToTensorV2\nfrom albumentations import ImageOnlyTransform\n\nimport timm\n\nimport warnings \nwarnings.filterwarnings('ignore')\n\nif CFG.apex:\n    from apex import amp\n\ndevice = torch.device('cuda' if torch.cuda.is_available() else 'cpu')","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:21.492117Z","iopub.execute_input":"2021-10-11T13:19:21.492449Z","iopub.status.idle":"2021-10-11T13:19:24.871157Z","shell.execute_reply.started":"2021-10-11T13:19:21.492416Z","shell.execute_reply":"2021-10-11T13:19:24.870118Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Utils","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Utils\n# ====================================================\ndef get_score(y_true, y_pred):\n    return accuracy_score(y_true, y_pred)\n\n\n@contextmanager\ndef timer(name):\n    t0 = time.time()\n    LOGGER.info(f'[{name}] start')\n    yield\n    LOGGER.info(f'[{name}] done in {time.time() - t0:.0f} s.')\n\n\ndef init_logger(log_file=OUTPUT_DIR+'train.log'):\n    from logging import getLogger, INFO, FileHandler,  Formatter,  StreamHandler\n    logger = getLogger(__name__)\n    logger.setLevel(INFO)\n    handler1 = StreamHandler()\n    handler1.setFormatter(Formatter(\"%(message)s\"))\n    handler2 = FileHandler(filename=log_file)\n    handler2.setFormatter(Formatter(\"%(message)s\"))\n    logger.addHandler(handler1)\n    logger.addHandler(handler2)\n    return logger\n\nLOGGER = init_logger()\n\n\ndef seed_torch(seed=42):\n    random.seed(seed)\n    os.environ['PYTHONHASHSEED'] = str(seed)\n    np.random.seed(seed)\n    torch.manual_seed(seed)\n    torch.cuda.manual_seed(seed)\n    torch.backends.cudnn.deterministic = True\n\nseed_torch(seed=CFG.seed)","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:44.788806Z","iopub.execute_input":"2021-10-11T13:19:44.789242Z","iopub.status.idle":"2021-10-11T13:19:44.804533Z","shell.execute_reply.started":"2021-10-11T13:19:44.789191Z","shell.execute_reply":"2021-10-11T13:19:44.80368Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# CV split","metadata":{}},{"cell_type":"code","source":"folds = train.copy()\nFold = StratifiedKFold(n_splits=CFG.n_fold, shuffle=True, random_state=CFG.seed)\nfor n, (train_index, val_index) in enumerate(Fold.split(folds, folds[CFG.target_col])):\n    folds.loc[val_index, 'fold'] = int(n)\nfolds['fold'] = folds['fold'].astype(int)\nprint(folds.groupby(['fold', CFG.target_col]).size())","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:47.828553Z","iopub.execute_input":"2021-10-11T13:19:47.828879Z","iopub.status.idle":"2021-10-11T13:19:47.857023Z","shell.execute_reply.started":"2021-10-11T13:19:47.828846Z","shell.execute_reply":"2021-10-11T13:19:47.856106Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Dataset","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Dataset\n# ====================================================\nclass TrainDataset(Dataset):\n    def __init__(self, df, transform=None):\n        self.df = df\n        self.file_names = df['image_id'].values\n        self.labels = df['label'].values\n        self.transform = transform\n        \n    def __len__(self):\n        return len(self.df)\n\n    def __getitem__(self, idx):\n        file_name = self.file_names[idx]\n        file_path = f'{TRAIN_PATH}/{file_name}'\n        image = cv2.imread(file_path)\n        image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)\n        if self.transform:\n            augmented = self.transform(image=image)\n            image = augmented['image']\n        label = torch.tensor(self.labels[idx]).long()\n        return image, label\n    \n\nclass TestDataset(Dataset):\n    def __init__(self, df, transform=None):\n        self.df = df\n        self.file_names = df['image_id'].values\n        self.transform = transform\n        \n    def __len__(self):\n        return len(self.df)\n\n    def __getitem__(self, idx):\n        file_name = self.file_names[idx]\n        file_path = f'{TEST_PATH}/{file_name}'\n        image = cv2.imread(file_path)\n        image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)\n        if self.transform:\n            augmented = self.transform(image=image)\n            image = augmented['image']\n        return image","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:19:54.362031Z","iopub.execute_input":"2021-10-11T13:19:54.362373Z","iopub.status.idle":"2021-10-11T13:19:54.380114Z","shell.execute_reply.started":"2021-10-11T13:19:54.362341Z","shell.execute_reply":"2021-10-11T13:19:54.379153Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"train_dataset = TrainDataset(train, transform=None)\n\nfor i in range(5):\n    image, label = train_dataset[i]\n    plt.imshow(image)\n    plt.title(f'label: {label}')\n    plt.show() ","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:20:09.520691Z","iopub.execute_input":"2021-10-11T13:20:09.521163Z","iopub.status.idle":"2021-10-11T13:20:10.973578Z","shell.execute_reply.started":"2021-10-11T13:20:09.52112Z","shell.execute_reply":"2021-10-11T13:20:10.972693Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Transforms","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Transforms\n# ====================================================\ndef get_transforms(*, data):\n    \n    if data == 'train':\n        return Compose([\n            #Resize(CFG.size, CFG.size),\n            RandomResizedCrop(CFG.size, CFG.size),\n            Transpose(p=0.5),\n            HorizontalFlip(p=0.5),\n            VerticalFlip(p=0.5),\n            ShiftScaleRotate(p=0.5),\n            Normalize(\n                mean=[0.485, 0.456, 0.406],\n                std=[0.229, 0.224, 0.225],\n            ),\n            ToTensorV2(),\n        ])\n\n    elif data == 'valid':\n        return Compose([\n            Resize(CFG.size, CFG.size),\n            Normalize(\n                mean=[0.485, 0.456, 0.406],\n                std=[0.229, 0.224, 0.225],\n            ),\n            ToTensorV2(),\n        ])","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:20:23.374521Z","iopub.execute_input":"2021-10-11T13:20:23.374865Z","iopub.status.idle":"2021-10-11T13:20:23.384246Z","shell.execute_reply.started":"2021-10-11T13:20:23.374833Z","shell.execute_reply":"2021-10-11T13:20:23.38311Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"train_dataset = TrainDataset(train, transform=get_transforms(data='train'))\n\nfor i in range(1):\n    image, label = train_dataset[i]\n    plt.imshow(image[0])\n    plt.title(f'label: {label}')\n    plt.show() ","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:20:41.965486Z","iopub.execute_input":"2021-10-11T13:20:41.965811Z","iopub.status.idle":"2021-10-11T13:20:42.147021Z","shell.execute_reply.started":"2021-10-11T13:20:41.965779Z","shell.execute_reply":"2021-10-11T13:20:42.146315Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# MODEL","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# MODEL\n# ====================================================\nclass CustomResNext(nn.Module):\n    def __init__(self, model_name='resnext50_32x4d', pretrained=False):\n        super().__init__()\n        self.model = timm.create_model(model_name, pretrained=pretrained)\n        n_features = self.model.fc.in_features\n        self.model.fc = nn.Linear(n_features, CFG.target_size)\n\n    def forward(self, x):\n        x = self.model(x)\n        return x","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:20:51.301484Z","iopub.execute_input":"2021-10-11T13:20:51.301854Z","iopub.status.idle":"2021-10-11T13:20:51.310043Z","shell.execute_reply.started":"2021-10-11T13:20:51.301822Z","shell.execute_reply":"2021-10-11T13:20:51.309033Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"model = CustomResNext(model_name=CFG.model_name, pretrained=False)\ntrain_dataset = TrainDataset(train, transform=get_transforms(data='train'))\ntrain_loader = DataLoader(train_dataset, batch_size=4, shuffle=True,\n                          num_workers=4, pin_memory=True, drop_last=True)\n\nfor image, label in train_loader:\n    output = model(image)\n    print(output)\n    break","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:20:53.376404Z","iopub.execute_input":"2021-10-11T13:20:53.376721Z","iopub.status.idle":"2021-10-11T13:20:59.135347Z","shell.execute_reply.started":"2021-10-11T13:20:53.376689Z","shell.execute_reply":"2021-10-11T13:20:59.133658Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Helper functions","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Helper functions\n# ====================================================\nclass AverageMeter(object):\n    \"\"\"Computes and stores the average and current value\"\"\"\n    def __init__(self):\n        self.reset()\n\n    def reset(self):\n        self.val = 0\n        self.avg = 0\n        self.sum = 0\n        self.count = 0\n\n    def update(self, val, n=1):\n        self.val = val\n        self.sum += val * n\n        self.count += n\n        self.avg = self.sum / self.count\n\n\ndef asMinutes(s):\n    m = math.floor(s / 60)\n    s -= m * 60\n    return '%dm %ds' % (m, s)\n\n\ndef timeSince(since, percent):\n    now = time.time()\n    s = now - since\n    es = s / (percent)\n    rs = es - s\n    return '%s (remain %s)' % (asMinutes(s), asMinutes(rs))\n\n\ndef train_fn(train_loader, model, criterion, optimizer, epoch, scheduler, device):\n    batch_time = AverageMeter()\n    data_time = AverageMeter()\n    losses = AverageMeter()\n    scores = AverageMeter()\n    # switch to train mode\n    model.train()\n    start = end = time.time()\n    global_step = 0\n    for step, (images, labels) in enumerate(train_loader):\n        # measure data loading time\n        data_time.update(time.time() - end)\n        images = images.to(device)\n        labels = labels.to(device)\n        batch_size = labels.size(0)\n        y_preds = model(images)\n        loss = criterion(y_preds, labels)\n        # record loss\n        losses.update(loss.item(), batch_size)\n        if CFG.gradient_accumulation_steps > 1:\n            loss = loss / CFG.gradient_accumulation_steps\n        if CFG.apex:\n            with amp.scale_loss(loss, optimizer) as scaled_loss:\n                scaled_loss.backward()\n        else:\n            loss.backward()\n        grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(), CFG.max_grad_norm)\n        if (step + 1) % CFG.gradient_accumulation_steps == 0:\n            optimizer.step()\n            optimizer.zero_grad()\n            global_step += 1\n        # measure elapsed time\n        batch_time.update(time.time() - end)\n        end = time.time()\n        if step % CFG.print_freq == 0 or step == (len(train_loader)-1):\n            print('Epoch: [{0}][{1}/{2}] '\n                  'Data {data_time.val:.3f} ({data_time.avg:.3f}) '\n                  'Elapsed {remain:s} '\n                  'Loss: {loss.val:.4f}({loss.avg:.4f}) '\n                  'Grad: {grad_norm:.4f}  '\n                  #'LR: {lr:.6f}  '\n                  .format(\n                   epoch+1, step, len(train_loader), batch_time=batch_time,\n                   data_time=data_time, loss=losses,\n                   remain=timeSince(start, float(step+1)/len(train_loader)),\n                   grad_norm=grad_norm,\n                   #lr=scheduler.get_lr()[0],\n                   ))\n    return losses.avg\n\n\ndef valid_fn(valid_loader, model, criterion, device):\n    batch_time = AverageMeter()\n    data_time = AverageMeter()\n    losses = AverageMeter()\n    scores = AverageMeter()\n    # switch to evaluation mode\n    model.eval()\n    preds = []\n    start = end = time.time()\n    for step, (images, labels) in enumerate(valid_loader):\n        # measure data loading time\n        data_time.update(time.time() - end)\n        images = images.to(device)\n        labels = labels.to(device)\n        batch_size = labels.size(0)\n        # compute loss\n        with torch.no_grad():\n            y_preds = model(images)\n        loss = criterion(y_preds, labels)\n        losses.update(loss.item(), batch_size)\n        # record accuracy\n        preds.append(y_preds.softmax(1).to('cpu').numpy())\n        if CFG.gradient_accumulation_steps > 1:\n            loss = loss / CFG.gradient_accumulation_steps\n        # measure elapsed time\n        batch_time.update(time.time() - end)\n        end = time.time()\n        if step % CFG.print_freq == 0 or step == (len(valid_loader)-1):\n            print('EVAL: [{0}/{1}] '\n                  'Data {data_time.val:.3f} ({data_time.avg:.3f}) '\n                  'Elapsed {remain:s} '\n                  'Loss: {loss.val:.4f}({loss.avg:.4f}) '\n                  .format(\n                   step, len(valid_loader), batch_time=batch_time,\n                   data_time=data_time, loss=losses,\n                   remain=timeSince(start, float(step+1)/len(valid_loader)),\n                   ))\n    predictions = np.concatenate(preds)\n    return losses.avg, predictions\n\n\ndef inference(model, states, test_loader, device):\n    model.to(device)\n    tk0 = tqdm(enumerate(test_loader), total=len(test_loader))\n    probs = []\n    for i, (images) in tk0:\n        images = images.to(device)\n        avg_preds = []\n        for state in states:\n            model.load_state_dict(state['model'])\n            model.eval()\n            with torch.no_grad():\n                y_preds = model(images)\n            avg_preds.append(y_preds.softmax(1).to('cpu').numpy())\n        avg_preds = np.mean(avg_preds, axis=0)\n        probs.append(avg_preds)\n    probs = np.concatenate(probs)\n    return probs","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:21:13.110783Z","iopub.execute_input":"2021-10-11T13:21:13.11122Z","iopub.status.idle":"2021-10-11T13:21:13.295115Z","shell.execute_reply.started":"2021-10-11T13:21:13.111179Z","shell.execute_reply":"2021-10-11T13:21:13.294197Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"# Train loop","metadata":{}},{"cell_type":"code","source":"# ====================================================\n# Train loop\n# ====================================================\ndef train_loop(folds, fold):\n\n    LOGGER.info(f\"========== fold: {fold} training ==========\")\n\n    # ====================================================\n    # loader\n    # ====================================================\n    trn_idx = folds[folds['fold'] != fold].index\n    val_idx = folds[folds['fold'] == fold].index\n\n    train_folds = folds.loc[trn_idx].reset_index(drop=True)\n    valid_folds = folds.loc[val_idx].reset_index(drop=True)\n\n    train_dataset = TrainDataset(train_folds, \n                                 transform=get_transforms(data='train'))\n    valid_dataset = TrainDataset(valid_folds, \n                                 transform=get_transforms(data='valid'))\n\n    train_loader = DataLoader(train_dataset, \n                              batch_size=CFG.batch_size, \n                              shuffle=True, \n                              num_workers=CFG.num_workers, pin_memory=True, drop_last=True)\n    valid_loader = DataLoader(valid_dataset, \n                              batch_size=CFG.batch_size, \n                              shuffle=False, \n                              num_workers=CFG.num_workers, pin_memory=True, drop_last=False)\n    \n    # ====================================================\n    # scheduler \n    # ====================================================\n    def get_scheduler(optimizer):\n        if CFG.scheduler=='ReduceLROnPlateau':\n            scheduler = ReduceLROnPlateau(optimizer, mode='min', factor=CFG.factor, patience=CFG.patience, verbose=True, eps=CFG.eps)\n        elif CFG.scheduler=='CosineAnnealingLR':\n            scheduler = CosineAnnealingLR(optimizer, T_max=CFG.T_max, eta_min=CFG.min_lr, last_epoch=-1)\n        elif CFG.scheduler=='CosineAnnealingWarmRestarts':\n            scheduler = CosineAnnealingWarmRestarts(optimizer, T_0=CFG.T_0, T_mult=1, eta_min=CFG.min_lr, last_epoch=-1)\n        return scheduler\n\n    # ====================================================\n    # model & optimizer\n    # ====================================================\n    model = CustomResNext(CFG.model_name, pretrained=True)\n    model.to(device)\n\n    optimizer = Adam(model.parameters(), lr=CFG.lr, weight_decay=CFG.weight_decay, amsgrad=False)\n    scheduler = get_scheduler(optimizer)\n\n    # ====================================================\n    # apex\n    # ====================================================\n    if CFG.apex:\n        model, optimizer = amp.initialize(model, optimizer, opt_level='O1', verbosity=0)\n\n    # ====================================================\n    # loop\n    # ====================================================\n    criterion = nn.CrossEntropyLoss()\n\n    best_score = 0.\n    best_loss = np.inf\n    \n    for epoch in range(CFG.epochs):\n        \n        start_time = time.time()\n        \n        # train\n        avg_loss = train_fn(train_loader, model, criterion, optimizer, epoch, scheduler, device)\n\n        # eval\n        avg_val_loss, preds = valid_fn(valid_loader, model, criterion, device)\n        valid_labels = valid_folds[CFG.target_col].values\n        \n        if isinstance(scheduler, ReduceLROnPlateau):\n            scheduler.step(avg_val_loss)\n        elif isinstance(scheduler, CosineAnnealingLR):\n            scheduler.step()\n        elif isinstance(scheduler, CosineAnnealingWarmRestarts):\n            scheduler.step()\n\n        # scoring\n        score = get_score(valid_labels, preds.argmax(1))\n\n        elapsed = time.time() - start_time\n\n        LOGGER.info(f'Epoch {epoch+1} - avg_train_loss: {avg_loss:.4f}  avg_val_loss: {avg_val_loss:.4f}  time: {elapsed:.0f}s')\n        LOGGER.info(f'Epoch {epoch+1} - Accuracy: {score}')\n\n        if score > best_score:\n            best_score = score\n            LOGGER.info(f'Epoch {epoch+1} - Save Best Score: {best_score:.4f} Model')\n            torch.save({'model': model.state_dict(), \n                        'preds': preds},\n                        OUTPUT_DIR+f'{CFG.model_name}_fold{fold}_best.pth')\n    \n    check_point = torch.load(OUTPUT_DIR+f'{CFG.model_name}_fold{fold}_best.pth')\n    valid_folds[[str(c) for c in range(5)]] = check_point['preds']\n    valid_folds['preds'] = check_point['preds'].argmax(1)\n\n    return valid_folds","metadata":{"_uuid":"8f2839f25d086af736a60e9eeb907d3b93b6e0e5","_cell_guid":"b1076dfc-b9ad-4769-8c92-a6c4dae69d19","execution":{"iopub.status.busy":"2021-10-11T13:21:16.488258Z","iopub.execute_input":"2021-10-11T13:21:16.488595Z","iopub.status.idle":"2021-10-11T13:21:16.512967Z","shell.execute_reply.started":"2021-10-11T13:21:16.488555Z","shell.execute_reply":"2021-10-11T13:21:16.511906Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# ====================================================\n# main\n# ====================================================\ndef main():\n\n    \"\"\"\n    Prepare: 1.train  2.test  3.submission  4.folds\n    \"\"\"\n\n    def get_result(result_df):\n        preds = result_df['preds'].values\n        labels = result_df[CFG.target_col].values\n        score = get_score(labels, preds)\n        LOGGER.info(f'Score: {score:<.5f}')\n    \n    if CFG.train:\n        # train \n        oof_df = pd.DataFrame()\n        for fold in range(CFG.n_fold):\n            if fold in CFG.trn_fold:\n                _oof_df = train_loop(folds, fold)\n                oof_df = pd.concat([oof_df, _oof_df])\n                LOGGER.info(f\"========== fold: {fold} result ==========\")\n                get_result(_oof_df)\n        # CV result\n        LOGGER.info(f\"========== CV ==========\")\n        get_result(oof_df)\n        # save result\n        oof_df.to_csv(OUTPUT_DIR+'oof_df.csv', index=False)\n    \n    if CFG.inference:\n        # inference\n        model = CustomResNext(CFG.model_name, pretrained=False)\n        states = [torch.load(OUTPUT_DIR+f'{CFG.model_name}_fold{fold}_best.pth') for fold in CFG.trn_fold]\n        test_dataset = TestDataset(test, transform=get_transforms(data='valid'))\n        test_loader = DataLoader(test_dataset, batch_size=CFG.batch_size, shuffle=False, \n                                 num_workers=CFG.num_workers, pin_memory=True)\n        predictions = inference(model, states, test_loader, device)\n        # submission\n        test['label'] = predictions.argmax(1)\n        test[['image_id', 'label']].to_csv(OUTPUT_DIR+'submission.csv', index=False)","metadata":{"execution":{"iopub.status.busy":"2021-10-11T13:21:18.601702Z","iopub.execute_input":"2021-10-11T13:21:18.602071Z","iopub.status.idle":"2021-10-11T13:21:18.616953Z","shell.execute_reply.started":"2021-10-11T13:21:18.602033Z","shell.execute_reply":"2021-10-11T13:21:18.616199Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"if __name__ == '__main__':\n    main()","metadata":{"_uuid":"d629ff2d2480ee46fbb7e2d37f6b5fab8052498a","_cell_guid":"79c7e3d0-c299-4dcb-8224-4455121ee9b0","execution":{"iopub.status.busy":"2021-10-11T13:21:23.753067Z","iopub.execute_input":"2021-10-11T13:21:23.753404Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"","metadata":{},"execution_count":null,"outputs":[]}]}