{"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"name":"python","version":"3.11.13","mimetype":"text/x-python","codemirror_mode":{"name":"ipython","version":3},"pygments_lexer":"ipython3","nbconvert_exporter":"python","file_extension":".py"},"kaggle":{"accelerator":"gpu","dataSources":[{"sourceId":21154,"databundleVersionId":1243559,"sourceType":"competition"}],"dockerImageVersionId":31193,"isInternetEnabled":true,"language":"python","sourceType":"notebook","isGpuEnabled":true}},"nbformat_minor":4,"nbformat":4,"cells":[{"cell_type":"code","source":"import numpy as np \nimport pandas as pd\nimport math, re, os\nimport tensorflow as tf\nimport numpy as np\nfrom matplotlib import pyplot as plt\nfrom kaggle_datasets import KaggleDatasets\nfrom sklearn.metrics import f1_score, precision_score, recall_score, confusion_matrix\nprint(\"Tensorflow version \" + tf.__version__)\nAUTO = tf.data.experimental.AUTOTUNE","metadata":{"_uuid":"d629ff2d2480ee46fbb7e2d37f6b5fab8052498a","_cell_guid":"79c7e3d0-c299-4dcb-8224-4455121ee9b0","trusted":true,"execution":{"iopub.status.busy":"2025-12-07T14:28:51.961488Z","iopub.execute_input":"2025-12-07T14:28:51.961645Z","iopub.status.idle":"2025-12-07T14:29:09.374736Z","shell.execute_reply.started":"2025-12-07T14:28:51.961631Z","shell.execute_reply":"2025-12-07T14:29:09.374096Z"}},"outputs":[],"execution_count":null},{"cell_type":"code","source":"# Detect hardware, return appropriate distribution strategy\ntry:\n    tpu = tf.distribute.cluster_resolver.TPUClusterResolver()  # TPU detection. No parameters necessary if TPU_NAME environment variable is set. On Kaggle this is always the case.\n    print('Running on TPU ', tpu.master())\nexcept ValueError:\n    tpu = None\n\nif tpu:\n    tf.config.experimental_connect_to_cluster(tpu)\n    tf.tpu.experimental.initialize_tpu_system(tpu)\n    strategy = tf.distribute.experimental.TPUStrategy(tpu)\nelse:\n    strategy = tf.distribute.get_strategy() # default distribution strategy in Tensorflow. Works on CPU and single GPU.\n\nprint(\"REPLICAS: \", strategy.num_replicas_in_sync)","metadata":{"trusted":true,"execution":{"iopub.status.busy":"2025-12-07T14:29:09.376025Z","iopub.execute_input":"2025-12-07T14:29:09.376461Z","iopub.status.idle":"2025-12-07T14:29:09.382387Z","shell.execute_reply.started":"2025-12-07T14:29:09.376443Z","shell.execute_reply":"2025-12-07T14:29:09.381592Z"}},"outputs":[],"execution_count":null},{"cell_type":"code","source":"GCS_DS_PATH = KaggleDatasets().get_gcs_path() # you can list the bucket with \"!gsutil ls $GCS_DS_PATH\"\nprint(GCS_DS_PATH) # what do gcs paths look like?","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:29:09.383169Z","iopub.execute_input":"2025-12-07T14:29:09.383468Z","iopub.status.idle":"2025-12-07T14:29:09.926862Z","shell.execute_reply.started":"2025-12-07T14:29:09.383433Z","shell.execute_reply":"2025-12-07T14:29:09.926099Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Load Data","metadata":{}},{"cell_type":"code","source":"if (tpu is not None):\n    IMAGE_SIZE = [512, 512] # At this size, a GPU will run out of memory. Use the TPU.\nelse:\n    IMAGE_SIZE = [224, 224] # At this size, a GPU will run out of memory. Use the TPU.\n                        # For GPU training, please select 224 x 224 px image size.\nBATCH_SIZE = 16 * strategy.num_replicas_in_sync\n\nGCS_PATH_SELECT = { # available image sizes\n    192: GCS_DS_PATH + '/tfrecords-jpeg-192x192',\n    224: GCS_DS_PATH + '/tfrecords-jpeg-224x224',\n    331: GCS_DS_PATH + '/tfrecords-jpeg-331x331',\n    512: GCS_DS_PATH + '/tfrecords-jpeg-512x512'\n}\nGCS_PATH = GCS_PATH_SELECT[IMAGE_SIZE[0]]\n\nTRAINING_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/train/*.tfrec')\nVALIDATION_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/val/*.tfrec')\nTEST_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/test/*.tfrec') # predictions on this dataset should be submitted for the competition\n\nCLASSES = ['pink primrose',    'hard-leaved pocket orchid', 'canterbury bells', 'sweet pea',     'wild geranium',     'tiger lily',           'moon orchid',              'bird of paradise', 'monkshood',        'globe thistle',         # 00 - 09\n           'snapdragon',       \"colt's foot\",               'king protea',      'spear thistle', 'yellow iris',       'globe-flower',         'purple coneflower',        'peruvian lily',    'balloon flower',   'giant white arum lily', # 10 - 19\n           'fire lily',        'pincushion flower',         'fritillary',       'red ginger',    'grape hyacinth',    'corn poppy',           'prince of wales feathers', 'stemless gentian', 'artichoke',        'sweet william',         # 20 - 29\n           'carnation',        'garden phlox',              'love in the mist', 'cosmos',        'alpine sea holly',  'ruby-lipped cattleya', 'cape flower',              'great masterwort', 'siam tulip',       'lenten rose',           # 30 - 39\n           'barberton daisy',  'daffodil',                  'sword lily',       'poinsettia',    'bolero deep blue',  'wallflower',           'marigold',                 'buttercup',        'daisy',            'common dandelion',      # 40 - 49\n           'petunia',          'wild pansy',                'primula',          'sunflower',     'lilac hibiscus',    'bishop of llandaff',   'gaura',                    'geranium',         'orange dahlia',    'pink-yellow dahlia',    # 50 - 59\n           'cautleya spicata', 'japanese anemone',          'black-eyed susan', 'silverbush',    'californian poppy', 'osteospermum',         'spring crocus',            'iris',             'windflower',       'tree poppy',            # 60 - 69\n           'gazania',          'azalea',                    'water lily',       'rose',          'thorn apple',       'morning glory',        'passion flower',           'lotus',            'toad lily',        'anthurium',             # 70 - 79\n           'frangipani',       'clematis',                  'hibiscus',         'columbine',     'desert-rose',       'tree mallow',          'magnolia',                 'cyclamen ',        'watercress',       'canna lily',            # 80 - 89\n           'hippeastrum ',     'bee balm',                  'pink quill',       'foxglove',      'bougainvillea',     'camellia',             'mallow',                   'mexican petunia',  'bromelia',         'blanket flower',        # 90 - 99\n           'trumpet creeper',  'blackberry lily',           'common tulip',     'wild rose']                                                                                                                                               # 100 - 102","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:29:09.927592Z","iopub.execute_input":"2025-12-07T14:29:09.92777Z","iopub.status.idle":"2025-12-07T14:29:10.215141Z","shell.execute_reply.started":"2025-12-07T14:29:09.927756Z","shell.execute_reply":"2025-12-07T14:29:10.214594Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"# using validation set for training to inch out last marginal performance improvement\nVALIDATION = True\nif not VALIDATION:\n    TRAINING_FILENAMES = TRAINING_FILENAMES + VALIDATION_FILENAMES","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:29:10.215748Z","iopub.execute_input":"2025-12-07T14:29:10.215917Z","iopub.status.idle":"2025-12-07T14:29:10.219396Z","shell.execute_reply.started":"2025-12-07T14:29:10.215903Z","shell.execute_reply":"2025-12-07T14:29:10.218583Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Visualization utilities","metadata":{}},{"cell_type":"code","source":"# numpy and matplotlib defaults\nnp.set_printoptions(threshold=15, linewidth=80)\n\ndef batch_to_numpy_images_and_labels(data):\n    images, labels = data\n    numpy_images = images.numpy()\n    numpy_labels = labels.numpy()\n    if numpy_labels.dtype == object:\n        numpy_labels = [None for _ in enumerate(numpy_images)]\n    return numpy_images, numpy_labels\n\ndef title_from_label_and_target(label, correct_label):\n    if correct_label is None:\n        return CLASSES[label], True\n    correct = (label == correct_label)\n    return \"{} [{}{}{}]\".format(CLASSES[label], 'OK' if correct else 'NO', u\"\\u2192\" if not correct else '',\n                                CLASSES[correct_label] if not correct else ''), correct\n\ndef display_one_flower(image, title, subplot, red=False, titlesize=16):\n    plt.subplot(*subplot)\n    plt.axis('off')\n    plt.imshow(image)\n    if len(title) > 0:\n        plt.title(title, fontsize=int(titlesize) if not red else int(titlesize/1.2), color='red' if red else 'black', fontdict={'verticalalignment':'center'}, pad=int(titlesize/1.5))\n    return (subplot[0], subplot[1], subplot[2]+1)\n    \ndef display_batch_of_images(databatch, predictions=None):\n    \"\"\"This will work with:\n    display_batch_of_images(images)\n    display_batch_of_images(images, predictions)\n    display_batch_of_images((images, labels))\n    display_batch_of_images((images, labels), predictions)\n    \"\"\"\n    # data\n    images, labels = batch_to_numpy_images_and_labels(databatch)\n    if labels is None:\n        labels = [None for _ in enumerate(images)]\n        \n    # auto-squaring: this will drop data that does not fit into square or square-ish rectangle\n    rows = int(math.sqrt(len(images)))\n    cols = len(images)//rows\n        \n    # size and spacing\n    FIGSIZE = 13.0\n    SPACING = 0.1\n    subplot=(rows,cols,1)\n    if rows < cols:\n        plt.figure(figsize=(FIGSIZE,FIGSIZE/cols*rows))\n    else:\n        plt.figure(figsize=(FIGSIZE/rows*cols,FIGSIZE))\n    \n    # display\n    for i, (image, label) in enumerate(zip(images[:rows*cols], labels[:rows*cols])):\n        title = '' if label is None else CLASSES[label]\n        correct = True\n        if predictions is not None:\n            title, correct = title_from_label_and_target(predictions[i], label)\n        dynamic_titlesize = FIGSIZE*SPACING/max(rows,cols)*40+3 # magic formula tested to work from 1x1 to 10x10 images\n        subplot = display_one_flower(image, title, subplot, not correct, titlesize=dynamic_titlesize)\n    \n    #layout\n    plt.tight_layout()\n    if label is None and predictions is None:\n        plt.subplots_adjust(wspace=0, hspace=0)\n    else:\n        plt.subplots_adjust(wspace=SPACING, hspace=SPACING)\n    plt.show()\n\ndef display_confusion_matrix(cmat, score, precision, recall):\n    plt.figure(figsize=(15,15))\n    ax = plt.gca()\n    ax.matshow(cmat, cmap='Reds')\n    ax.set_xticks(range(len(CLASSES)))\n    ax.set_xticklabels(CLASSES, fontdict={'fontsize': 7})\n    plt.setp(ax.get_xticklabels(), rotation=45, ha=\"left\", rotation_mode=\"anchor\")\n    ax.set_yticks(range(len(CLASSES)))\n    ax.set_yticklabels(CLASSES, fontdict={'fontsize': 7})\n    plt.setp(ax.get_yticklabels(), rotation=45, ha=\"right\", rotation_mode=\"anchor\")\n    titlestring = \"\"\n    if score is not None:\n        titlestring += 'f1 = {:.3f} '.format(score)\n    if precision is not None:\n        titlestring += '\\nprecision = {:.3f} '.format(precision)\n    if recall is not None:\n        titlestring += '\\nrecall = {:.3f} '.format(recall)\n    if len(titlestring) > 0:\n        ax.text(101, 1, titlestring, fontdict={'fontsize': 18, 'horizontalalignment':'right', 'verticalalignment':'top', 'color':'#804040'})\n    plt.show()\n    \ndef display_training_curves(training, validation, title, subplot):\n    if subplot%10==1: # set up the subplots on the first call\n        plt.subplots(figsize=(10,10), facecolor='#F0F0F0')\n        plt.tight_layout()\n    ax = plt.subplot(subplot)\n    ax.set_facecolor('#F8F8F8')\n    ax.plot(training)\n    \n    if (validation is not None):\n        ax.plot(validation)\n        \n    ax.set_title('model '+ title)\n    ax.set_ylabel(title)\n    #ax.set_ylim(0.28,1.05)\n    ax.set_xlabel('epoch')\n    ax.legend(['train', 'valid.'])","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:29:10.220119Z","iopub.execute_input":"2025-12-07T14:29:10.220367Z","iopub.status.idle":"2025-12-07T14:29:10.23871Z","shell.execute_reply.started":"2025-12-07T14:29:10.22035Z","shell.execute_reply":"2025-12-07T14:29:10.238097Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Datasets","metadata":{}},{"cell_type":"code","source":"def random_blockout(img, sl=0.1, sh=0.2, rl=0.4):\n    p=np.random.random()\n    if p>=0.35:\n        w, h, c = IMAGE_SIZE[0], IMAGE_SIZE[1], 3\n        origin_area = tf.cast(h*w, tf.float32)\n\n        e_size_l = tf.cast(tf.round(tf.sqrt(origin_area * sl * rl)), tf.int32)\n        e_size_h = tf.cast(tf.round(tf.sqrt(origin_area * sh / rl)), tf.int32)\n\n        e_height_h = tf.minimum(e_size_h, h)\n        e_width_h = tf.minimum(e_size_h, w)\n\n        erase_height = tf.random.uniform(shape=[], minval=e_size_l, maxval=e_height_h, dtype=tf.int32)\n        erase_width = tf.random.uniform(shape=[], minval=e_size_l, maxval=e_width_h, dtype=tf.int32)\n\n        erase_area = tf.zeros(shape=[erase_height, erase_width, c])\n        erase_area = tf.cast(erase_area, tf.uint8)\n\n        pad_h = h - erase_height\n        pad_top = tf.random.uniform(shape=[], minval=0, maxval=pad_h, dtype=tf.int32)\n        pad_bottom = pad_h - pad_top\n\n        pad_w = w - erase_width\n        pad_left = tf.random.uniform(shape=[], minval=0, maxval=pad_w, dtype=tf.int32)\n        pad_right = pad_w - pad_left\n\n        erase_mask = tf.pad([erase_area], [[0,0],[pad_top, pad_bottom], [pad_left, pad_right], [0,0]], constant_values=1)\n        erase_mask = tf.squeeze(erase_mask, axis=0)\n        erased_img = tf.multiply(tf.cast(img,tf.float32), tf.cast(erase_mask, tf.float32))\n\n        return tf.cast(erased_img, img.dtype)\n    else:\n        return tf.cast(img, img.dtype)","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:29:10.240204Z","iopub.execute_input":"2025-12-07T14:29:10.240447Z","iopub.status.idle":"2025-12-07T14:29:10.257611Z","shell.execute_reply.started":"2025-12-07T14:29:10.240432Z","shell.execute_reply":"2025-12-07T14:29:10.257007Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"# import tensorflow_addons as tfa\n\ndef decode_image(image_data):\n    image = tf.image.decode_jpeg(image_data, channels=3)\n    image = tf.cast(image, tf.float32) / 255.0  # convert image to floats in [0, 1] range\n    image = tf.reshape(image, [*IMAGE_SIZE, 3]) # explicit size needed for TPU\n    return image\n\ndef read_labeled_tfrecord(example):\n    LABELED_TFREC_FORMAT = {\n        \"image\": tf.io.FixedLenFeature([], tf.string), # tf.string means bytestring\n        \"class\": tf.io.FixedLenFeature([], tf.int64),  # shape [] means single element\n    }\n    example = tf.io.parse_single_example(example, LABELED_TFREC_FORMAT)\n    image = decode_image(example['image'])\n    label = tf.cast(example['class'], tf.int32)\n    return image, label # returns a dataset of (image, label) pairs\n\ndef read_unlabeled_tfrecord(example):\n    UNLABELED_TFREC_FORMAT = {\n        \"image\": tf.io.FixedLenFeature([], tf.string), # tf.string means bytestring\n        \"id\": tf.io.FixedLenFeature([], tf.string),  # shape [] means single element\n        # class is missing, this competitions's challenge is to predict flower classes for the test dataset\n    }\n    example = tf.io.parse_single_example(example, UNLABELED_TFREC_FORMAT)\n    image = decode_image(example['image'])\n    idnum = example['id']\n    return image, idnum # returns a dataset of image(s)\n\ndef load_dataset(filenames, labeled=True, ordered=False):\n    # Read from TFRecords. For optimal performance, reading from multiple files at once and\n    # disregarding data order. Order does not matter since we will be shuffling the data anyway.\n\n    ignore_order = tf.data.Options()\n    if not ordered:\n        ignore_order.experimental_deterministic = False # disable order, increase speed\n\n    dataset = tf.data.TFRecordDataset(filenames, num_parallel_reads=AUTO) # automatically interleaves reads from multiple files\n    dataset = dataset.with_options(ignore_order) # uses data as soon as it streams in, rather than in its original order\n    dataset = dataset.map(read_labeled_tfrecord if labeled else read_unlabeled_tfrecord, num_parallel_calls=AUTO)\n    # returns a dataset of (image, label) pairs if labeled=True or (image, id) pairs if labeled=False\n    return dataset\n\ndef data_augment(image, label):\n    #print(image.shape)\n  \n    # data augmentation. \n    image = tf.image.random_flip_left_right(image)\n    image = tf.image.random_saturation(image, 0.7, 1.3)\n    \n    #image = tfa.image.rotate(image, np.random.uniform(-np.pi, np.pi))    \n    # image = tfa.image.rotate(image, tf.random.normal([1], 0, np.pi / 8))\n    def random_rotation_90(image):\n        # Случайное количество поворотов на 90 градусов\n        k = tf.random.uniform(shape=[], minval=0, maxval=4, dtype=tf.int32)\n        image = tf.image.rot90(image, k)\n        \n        # Случайное отражение по горизонтали/вертикали для большего разнообразия\n        if tf.random.uniform([]) > 0.5:\n            image = tf.image.flip_left_right(image)\n        if tf.random.uniform([]) > 0.5:\n            image = tf.image.flip_up_down(image)\n            \n        return image\n    \n    image = random_rotation_90(image)\n    \n    # IMAGE_SIZE[0] is size\n    scale = min(1.0, np.random.uniform(0.6, 1.4))\n    image = tf.image.resize_with_pad(tf.image.central_crop(image, scale), IMAGE_SIZE[0], IMAGE_SIZE[0])\n    \n    image = tf.image.adjust_jpeg_quality(image, jpeg_quality = int(np.random.uniform(20, 95)))\n    \n    # extra step to add blockouts\n    image = random_blockout(image, rl=0.8)\n    \n    return image, label  \n\ndef get_training_dataset():\n    dataset = load_dataset(TRAINING_FILENAMES, labeled=True)\n    dataset = dataset.repeat() # the training dataset must repeat for several epochs\n    dataset = dataset.shuffle(2048)\n    dataset = dataset.map(data_augment, num_parallel_calls=AUTO)    \n    #dataset = dataset.map((lambda x: tf.py_function(data_augment, [x], [tf.float32])), num_parallel_calls=AUTO)\n    \n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.prefetch(AUTO) # prefetch next batch while training (autotune prefetch buffer size)\n    return dataset\n\ndef get_validation_dataset(ordered=False):\n    dataset = load_dataset(VALIDATION_FILENAMES, labeled=True, ordered=ordered)\n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.cache()\n    dataset = dataset.prefetch(AUTO) # prefetch next batch while training (autotune prefetch buffer size)\n    return dataset\n\ndef get_test_dataset(ordered=False):\n    dataset = load_dataset(TEST_FILENAMES, labeled=False, ordered=ordered)\n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.prefetch(AUTO) # prefetch next batch while training (autotune prefetch buffer size)\n    return dataset\n\ndef count_data_items(filenames):\n    # the number of data items is written in the name of the .tfrec files, i.e. flowers00-230.tfrec = 230 data items\n    n = [int(re.compile(r\"-([0-9]*)\\.\").search(filename).group(1)) for filename in filenames]\n    return np.sum(n)\n\nNUM_TRAINING_IMAGES = count_data_items(TRAINING_FILENAMES)\nNUM_VALIDATION_IMAGES = count_data_items(VALIDATION_FILENAMES)\nNUM_TEST_IMAGES = count_data_items(TEST_FILENAMES)\nSTEPS_PER_EPOCH = NUM_TRAINING_IMAGES // BATCH_SIZE\nprint('Dataset: {} training images, {} validation images, {} unlabeled test images'.format(NUM_TRAINING_IMAGES, NUM_VALIDATION_IMAGES, NUM_TEST_IMAGES))\n","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:15.885345Z","iopub.execute_input":"2025-12-07T14:31:15.88569Z","iopub.status.idle":"2025-12-07T14:31:15.902078Z","shell.execute_reply.started":"2025-12-07T14:31:15.885662Z","shell.execute_reply":"2025-12-07T14:31:15.901321Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Dataset visualizations","metadata":{}},{"cell_type":"code","source":"# data dump\nprint(\"Training data shapes:\")\nfor image, label in get_training_dataset().take(3):\n    print(image.numpy().shape, label.numpy().shape)\nprint(\"Training data label examples:\", label.numpy())\nprint(\"Validation data shapes:\")\nfor image, label in get_validation_dataset().take(3):\n    print(image.numpy().shape, label.numpy().shape)\nprint(\"Validation data label examples:\", label.numpy())\nprint(\"Test data shapes:\")\nfor image, idnum in get_test_dataset().take(3):\n    print(image.numpy().shape, idnum.numpy().shape)\nprint(\"Test data IDs:\", idnum.numpy().astype('U')) # U=unicode string","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:17.352397Z","iopub.execute_input":"2025-12-07T14:31:17.352685Z","iopub.status.idle":"2025-12-07T14:31:23.221426Z","shell.execute_reply.started":"2025-12-07T14:31:17.352667Z","shell.execute_reply":"2025-12-07T14:31:23.220685Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"# Peek at training data\ntraining_dataset = get_training_dataset()\ntraining_dataset = training_dataset.unbatch().batch(20)\ntrain_batch = iter(training_dataset)\n\n# run this cell again for next set of images\ndisplay_batch_of_images(next(train_batch))","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:23.222547Z","iopub.execute_input":"2025-12-07T14:31:23.222739Z","iopub.status.idle":"2025-12-07T14:31:27.079281Z","shell.execute_reply.started":"2025-12-07T14:31:23.222725Z","shell.execute_reply":"2025-12-07T14:31:27.078125Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"# peek at test data\ntest_dataset = get_test_dataset()\ntest_dataset = test_dataset.unbatch().batch(20)\ntest_batch = iter(test_dataset)\n\n# run this cell again for next set of images\ndisplay_batch_of_images(next(test_batch))","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:27.080335Z","iopub.execute_input":"2025-12-07T14:31:27.080653Z","iopub.status.idle":"2025-12-07T14:31:29.208548Z","shell.execute_reply.started":"2025-12-07T14:31:27.08063Z","shell.execute_reply":"2025-12-07T14:31:29.207375Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Models","metadata":{"trusted":true}},{"cell_type":"code","source":"with strategy.scope():\n    dn = tf.keras.applications.densenet.DenseNet121(weights='imagenet', \n                                              include_top=False, \n                                              input_shape=[*IMAGE_SIZE, 3],\n                                              #classes=len(CLASSES)\n                                             )\n    dn.trainable = True # Full Training\n    \n    model = tf.keras.Sequential([\n        dn,\n        tf.keras.layers.Dropout(0.2),\n        tf.keras.layers.GlobalAveragePooling2D(),\n        tf.keras.layers.Dropout(0.01),\n        tf.keras.layers.Dense(len(CLASSES), activation='softmax'\n                              #kernel_constraint=maxnorm(3)\n                             )\n    ])\n        \nmodel.compile(\n    optimizer = tf.keras.optimizers.Adam(learning_rate=0.001, \n                                         beta_1=0.9, \n                                         beta_2=0.999, \n                                         epsilon=1e-07, \n                                         amsgrad=False),\n    loss = 'sparse_categorical_crossentropy',\n    metrics=['sparse_categorical_accuracy']\n)\n\nmodel.summary()","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:29.210745Z","iopub.execute_input":"2025-12-07T14:31:29.210985Z","iopub.status.idle":"2025-12-07T14:31:32.958194Z","shell.execute_reply.started":"2025-12-07T14:31:29.210966Z","shell.execute_reply":"2025-12-07T14:31:32.957602Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"LR_START = 0.00005\nLR_MAX =   0.00005 * strategy.num_replicas_in_sync\nLR_MIN =   0.0000025\nLR_RAMPUP_EPOCHS = 3\nLR_SUSTAIN_EPOCHS = 6\nLR_EXP_DECAY = .8\n\ndef lrfn(epoch):\n    if epoch < LR_RAMPUP_EPOCHS:\n        lr =  np.random.random_sample() * LR_START\n    elif epoch < LR_RAMPUP_EPOCHS + LR_SUSTAIN_EPOCHS:\n        lr = LR_MAX\n    else:\n        lr = (LR_MAX - LR_MIN) * LR_EXP_DECAY**(epoch - LR_RAMPUP_EPOCHS - LR_SUSTAIN_EPOCHS) + LR_MIN\n    return lr\n    \nlr_callback = tf.keras.callbacks.LearningRateScheduler(lrfn, verbose=True)","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:32.958921Z","iopub.execute_input":"2025-12-07T14:31:32.959181Z","iopub.status.idle":"2025-12-07T14:31:32.964299Z","shell.execute_reply.started":"2025-12-07T14:31:32.959154Z","shell.execute_reply":"2025-12-07T14:31:32.963707Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"es_callback = tf.keras.callbacks.EarlyStopping(min_delta = 0, \n                                               patience = 10, \n                                               verbose = 1, \n                                               mode = 'auto', \n                                               restore_best_weights = True)","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:32.965016Z","iopub.execute_input":"2025-12-07T14:31:32.965294Z","iopub.status.idle":"2025-12-07T14:31:33.019732Z","shell.execute_reply.started":"2025-12-07T14:31:32.965271Z","shell.execute_reply":"2025-12-07T14:31:33.019095Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Training","metadata":{}},{"cell_type":"markdown","source":"## Train Model","metadata":{}},{"cell_type":"code","source":"if VALIDATION:\n    history1 = model.fit(get_training_dataset(), \n                          steps_per_epoch = STEPS_PER_EPOCH, \n                          epochs = 120, \n                          validation_data = get_validation_dataset(), \n                          callbacks = [\n                              lr_callback, \n                              es_callback\n                          ])\nelse:\n    history1 = model.fit(get_training_dataset(), \n                          steps_per_epoch = STEPS_PER_EPOCH, \n                          epochs = 160, \n                          callbacks = [\n                              lr_callback\n                          ])","metadata":{"execution":{"iopub.status.busy":"2025-12-07T14:31:36.414249Z","iopub.execute_input":"2025-12-07T14:31:36.414728Z","iopub.status.idle":"2025-12-07T15:23:49.129009Z","shell.execute_reply.started":"2025-12-07T14:31:36.414707Z","shell.execute_reply":"2025-12-07T15:23:49.128207Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"if VALIDATION:\n    display_training_curves(history1.history['loss'], \n                            history1.history['val_loss'], 'M1 - loss', 211)\n\n    display_training_curves(history1.history['sparse_categorical_accuracy'], \n                            history1.history['val_sparse_categorical_accuracy'], 'M1 - accuracy', 212)\nelse:\n    display_training_curves(history1.history['loss'], \n                           None, 'M1 - loss', 211)\n\n    display_training_curves(history1.history['sparse_categorical_accuracy'], \n                            None, 'M1 - accuracy', 212)\n    ","metadata":{"execution":{"iopub.status.busy":"2025-12-07T15:23:49.131358Z","iopub.execute_input":"2025-12-07T15:23:49.131577Z","iopub.status.idle":"2025-12-07T15:23:49.587526Z","shell.execute_reply.started":"2025-12-07T15:23:49.13156Z","shell.execute_reply":"2025-12-07T15:23:49.5867Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"if VALIDATION:    \n    cmdataset = get_validation_dataset(ordered=True) # since we are splitting the dataset and iterating separately on images and labels, order matters.\n    images_ds = cmdataset.map(lambda image, label: image)\n    labels_ds = cmdataset.map(lambda image, label: label).unbatch()\n    cm_correct_labels = next(iter(labels_ds.batch(NUM_VALIDATION_IMAGES))).numpy() # get everything as one batch\n\n    cm_probabilities = model.predict(images_ds)\n    cm_predictions = np.argmax(cm_probabilities, axis=-1)\n    print(\"Correct   labels: \", cm_correct_labels.shape, cm_correct_labels)\n    print(\"Predicted labels: \", cm_predictions.shape, cm_predictions)","metadata":{"execution":{"execution_failed":"2025-12-05T15:16:18.53Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"code","source":"if VALIDATION: \n    cmat = confusion_matrix(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)))\n    score = f1_score(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)), average='macro')\n    precision = precision_score(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)), average='macro')\n    recall = recall_score(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)), average='macro')\n    #cmat = (cmat.T / cmat.sum(axis=1)).T # normalized\n    display_confusion_matrix(cmat, score, precision, recall)\n    print('f1 score: {:.3f}, precision: {:.3f}, recall: {:.3f}'.format(score, precision, recall))","metadata":{"execution":{"execution_failed":"2025-12-05T15:16:18.53Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"# Predictions","metadata":{}},{"cell_type":"code","source":"test_ds = get_test_dataset(ordered=True) # since we are splitting the dataset and iterating separately on images and ids, order matters.\n\nprint('Computing predictions...')\ntest_images_ds = test_ds.map(lambda image, idnum: image)\nprobabilities = model.predict(test_images_ds) \n\npredictions = np.argmax(probabilities, axis=-1)\nprint(predictions)\n\nprint('Generating submission.csv file...')\ntest_ids_ds = test_ds.map(lambda image, idnum: idnum).unbatch()\ntest_ids = next(iter(test_ids_ds.batch(NUM_TEST_IMAGES))).numpy().astype('U') # all in one batch\nnp.savetxt('submission.csv', np.rec.fromarrays([test_ids, predictions]), fmt=['%s', '%d'], delimiter=',', header='id,label', comments='')\n!head submission.csv","metadata":{"execution":{"execution_failed":"2025-12-05T15:16:18.53Z"},"trusted":true},"outputs":[],"execution_count":null},{"cell_type":"markdown","source":"Save models and convert them to **tflite**","metadata":{}},{"cell_type":"code","source":"model.save(\"model.h5\")\n\ndef model_to_tflite(model_h5_name, output_name):    \n    model = tf.keras.models.load_model(model_h5_name)\n    \n    # Convert the model\n    converter = tf.lite.TFLiteConverter.from_keras_model(model)\n    tflite_model = converter.convert()\n\n    # Save the model.\n    with open(output_name, 'wb') as f:\n      f.write(tflite_model)\n\nmodel_to_tflite(\"model.h5\",\"model.tflite\")\n","metadata":{"execution":{"execution_failed":"2025-12-05T15:16:18.53Z"},"trusted":true},"outputs":[],"execution_count":null}]}