{"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":"code","source":"import math, re, os\nimport numpy as np\nimport tensorflow as tf\n\nprint(\"Tensorflow version \" + tf.__version__)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:16.75136Z","iopub.execute_input":"2021-08-30T20:12:16.752383Z","iopub.status.idle":"2021-08-30T20:12:19.117368Z","shell.execute_reply.started":"2021-08-30T20:12:16.752131Z","shell.execute_reply":"2021-08-30T20:12:19.116346Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"try:\n    tpu = tf.distribute.cluster_resolver.TPUClusterResolver() \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() \n\nprint(\"REPLICAS: \", strategy.num_replicas_in_sync)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:19.118907Z","iopub.execute_input":"2021-08-30T20:12:19.119223Z","iopub.status.idle":"2021-08-30T20:12:24.403439Z","shell.execute_reply.started":"2021-08-30T20:12:19.119192Z","shell.execute_reply":"2021-08-30T20:12:24.402073Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"from kaggle_datasets import KaggleDatasets\n\nGCS_DS_PATH = KaggleDatasets().get_gcs_path('tpu-getting-started')\nprint(GCS_DS_PATH) ","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:24.405228Z","iopub.execute_input":"2021-08-30T20:12:24.405537Z","iopub.status.idle":"2021-08-30T20:12:24.790114Z","shell.execute_reply.started":"2021-08-30T20:12:24.405508Z","shell.execute_reply":"2021-08-30T20:12:24.788987Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\n\nIMAGE_SIZE = [512, 512]\nGCS_PATH = GCS_DS_PATH + '/tfrecords-jpeg-512x512'\nAUTO = tf.data.experimental.AUTOTUNE\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') \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\n\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\n","metadata":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2021-08-30T20:12:24.791804Z","iopub.execute_input":"2021-08-30T20:12:24.792098Z","iopub.status.idle":"2021-08-30T20:12:25.0153Z","shell.execute_reply.started":"2021-08-30T20:12:24.792068Z","shell.execute_reply":"2021-08-30T20:12:25.013986Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"The random_erasing part is taken from this amazing kernel made by @atamazian https://www.kaggle.com/atamazian/fc-ensemble-external-data-effnet-densenet/ do check it out.","metadata":{}},{"cell_type":"code","source":"def random_erasing(img, sl=0.1, sh=0.2, rl=0.4, p=0.3):\n    h = tf.shape(img)[0]\n    w = tf.shape(img)[1]\n    c = tf.shape(img)[2]\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.cond(tf.random.uniform([], 0, 1) > p, lambda: tf.cast(img, img.dtype), lambda:  tf.cast(erased_img, img.dtype))","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:25.01854Z","iopub.execute_input":"2021-08-30T20:12:25.018886Z","iopub.status.idle":"2021-08-30T20:12:25.032778Z","shell.execute_reply.started":"2021-08-30T20:12:25.018854Z","shell.execute_reply":"2021-08-30T20:12:25.031629Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\ndef data_augment(image, label):\n    image = tf.image.random_flip_left_right(image)\n    #image = tf.image.random_saturation(image, 0, 2) #adjusts the image saturation uncomment it if req. might \n                                            #increases acc but will decrease speed\n    image = random_erasing(image)\n    return image, label   \ndef data_hflip(image, idnum):\n    image = tf.image.flip_left_right(image)\n    return image, idnum\n\ndef get_training_dataset():\n    dataset = load_dataset(TRAINING_FILENAMES, labeled=True)\n    dataset = dataset.map(data_augment, num_parallel_calls=AUTO)\n    dataset = dataset.repeat() # the training dataset must repeat for several epochs\n    dataset = dataset.shuffle(2048)\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)\n    return dataset\n\ndef get_test_dataset(ordered=False):\n    dataset = load_dataset(TEST_FILENAMES, labeled=False, ordered=ordered)\n    dataset = dataset.map(data_hflip, num_parallel_calls=AUTO)\n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.prefetch(AUTO)\n    return dataset\n\ndef count_data_items(filenames):\n    # the number of data items is written in the name of the .tfrec\n    # 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)\nprint('Dataset: {} training images, {} validation images, {} unlabeled test images'.format(NUM_TRAINING_IMAGES, NUM_VALIDATION_IMAGES, NUM_TEST_IMAGES))\n","metadata":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2021-08-30T20:12:25.035006Z","iopub.execute_input":"2021-08-30T20:12:25.035347Z","iopub.status.idle":"2021-08-30T20:12:25.051273Z","shell.execute_reply.started":"2021-08-30T20:12:25.035313Z","shell.execute_reply":"2021-08-30T20:12:25.050335Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# Define the batch size. This will be 16 with TPU off and 128 (=16*8) with TPU on\nBATCH_SIZE = 16 * strategy.num_replicas_in_sync\n\nds_train = get_training_dataset()\nds_valid = get_validation_dataset()\nds_test = get_test_dataset()\n\nprint(\"Training:\", ds_train)\nprint (\"Validation:\", ds_valid)\nprint(\"Test:\", ds_test)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:25.052441Z","iopub.execute_input":"2021-08-30T20:12:25.052832Z","iopub.status.idle":"2021-08-30T20:12:25.813958Z","shell.execute_reply.started":"2021-08-30T20:12:25.052791Z","shell.execute_reply":"2021-08-30T20:12:25.813005Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"np.set_printoptions(threshold=15, linewidth=80)\n\nprint(\"Training data shapes:\")\nfor image, label in ds_train.take(3):\n    print(image.numpy().shape, label.numpy().shape)\nprint(\"Training data label examples:\", label.numpy())","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:25.816367Z","iopub.execute_input":"2021-08-30T20:12:25.816664Z","iopub.status.idle":"2021-08-30T20:12:30.845909Z","shell.execute_reply.started":"2021-08-30T20:12:25.816635Z","shell.execute_reply":"2021-08-30T20:12:30.844825Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"print(\"Test data shapes:\")\nfor image, idnum in ds_test.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":"2021-08-30T20:12:30.848142Z","iopub.execute_input":"2021-08-30T20:12:30.848528Z","iopub.status.idle":"2021-08-30T20:12:33.648714Z","shell.execute_reply.started":"2021-08-30T20:12:30.848465Z","shell.execute_reply":"2021-08-30T20:12:33.647702Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\nfrom matplotlib import pyplot as plt\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: # binary string in this case,\n                                     # these are image ID strings\n        numpy_labels = [None for _ in enumerate(numpy_images)]\n    # If no labels, only image IDs, return None for labels (this is\n    # the case for test data)\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\n    # 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\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    ax.plot(validation)\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":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2021-08-30T20:12:33.649902Z","iopub.execute_input":"2021-08-30T20:12:33.650189Z","iopub.status.idle":"2021-08-30T20:12:33.670221Z","shell.execute_reply.started":"2021-08-30T20:12:33.65016Z","shell.execute_reply":"2021-08-30T20:12:33.669124Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"ds_iter = iter(ds_train.unbatch().batch(25))","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:33.671879Z","iopub.execute_input":"2021-08-30T20:12:33.672304Z","iopub.status.idle":"2021-08-30T20:12:33.696968Z","shell.execute_reply.started":"2021-08-30T20:12:33.672262Z","shell.execute_reply":"2021-08-30T20:12:33.695802Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"one_batch = next(ds_iter)\ndisplay_batch_of_images(one_batch)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:33.698142Z","iopub.execute_input":"2021-08-30T20:12:33.698559Z","iopub.status.idle":"2021-08-30T20:12:38.879011Z","shell.execute_reply.started":"2021-08-30T20:12:33.698515Z","shell.execute_reply":"2021-08-30T20:12:38.878045Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"!pip install -q efficientnet\nimport efficientnet.tfkeras as efn","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:38.880111Z","iopub.execute_input":"2021-08-30T20:12:38.880501Z","iopub.status.idle":"2021-08-30T20:12:46.445271Z","shell.execute_reply.started":"2021-08-30T20:12:38.880471Z","shell.execute_reply":"2021-08-30T20:12:46.443999Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"Choosing EfficientNetB7 and inception_resnetv2 because both were top performing models in imagenet dataset","metadata":{}},{"cell_type":"code","source":"EPOCHS = 55\n\nwith strategy.scope():\n    pretrained_model = tf.keras.applications.InceptionResNetV2(\n        weights='imagenet',\n        include_top=False ,\n        input_shape=[*IMAGE_SIZE, 3]\n    )\n    pretrained_model.trainable = True\n    for each_layer in pretrained_model.layers[:30]:\n        each_layer.trainable =  False\n    model_ir2 = tf.keras.Sequential([\n        # To a base pretrained on ImageNet to extract features from images...\n        pretrained_model,\n        # ... attach a new head to act as a classifier.\n        tf.keras.layers.GlobalAveragePooling2D(),\n        tf.keras.layers.Dense(len(CLASSES), activation='softmax')\n    ])\n    model_ir2.compile(\n    optimizer=tf.keras.optimizers.Adam(learning_rate=0.001),\n    loss = 'sparse_categorical_crossentropy',\n    metrics=['sparse_categorical_accuracy'],\n)\n\nmodel_ir2.summary()\nwith strategy.scope():\n    pretrained_model_eb7 = efn.EfficientNetB7(\n        weights='noisy-student',\n        include_top=False ,\n        input_shape=[*IMAGE_SIZE, 3]\n    )\n    pretrained_model_eb7.trainable = True\n    model_eb7 = tf.keras.Sequential([\n        pretrained_model_eb7,\n        tf.keras.layers.GlobalAveragePooling2D(),\n        tf.keras.layers.Dense(len(CLASSES), activation='softmax')\n    ])\n    model_eb7.compile(\n        optimizer=tf.keras.optimizers.Adam(learning_rate=0.0005),\n        loss = 'sparse_categorical_crossentropy',\n        metrics=['sparse_categorical_accuracy'],\n    )\nmodel_eb7.summary()","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:12:46.447299Z","iopub.execute_input":"2021-08-30T20:12:46.447757Z","iopub.status.idle":"2021-08-30T20:14:06.048211Z","shell.execute_reply.started":"2021-08-30T20:12:46.447708Z","shell.execute_reply":"2021-08-30T20:14:06.047152Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"The `'sparse_categorical'` versions of the loss and metrics are appropriate for a classification task with more than two labels, like this one.","metadata":{}},{"cell_type":"code","source":"","metadata":{"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\n# Learning Rate Schedule for Fine Tuning #\ndef exponential_lr(epoch,\n                   start_lr = 0.00001, min_lr = 0.00001, max_lr = 0.00005,\n                   rampup_epochs = 5, sustain_epochs = 0,\n                   exp_decay = 0.8):\n\n    def lr(epoch, start_lr, min_lr, max_lr, rampup_epochs, sustain_epochs, exp_decay):\n        # linear increase from start to rampup_epochs\n        if epoch < rampup_epochs:\n            lr = ((max_lr - start_lr) /\n                  rampup_epochs * epoch + start_lr)\n        # constant max_lr during sustain_epochs\n        elif epoch < rampup_epochs + sustain_epochs:\n            lr = max_lr\n        # exponential decay towards min_lr\n        else:\n            lr = ((max_lr - min_lr) *\n                  exp_decay**(epoch - rampup_epochs - sustain_epochs) +\n                  min_lr)\n        return lr\n    return lr(epoch,\n              start_lr,\n              min_lr,\n              max_lr,\n              rampup_epochs,\n              sustain_epochs,\n              exp_decay)\n\nlr_callback = tf.keras.callbacks.LearningRateScheduler(exponential_lr, verbose=True)\nrng = [i for i in range(EPOCHS)]\ny = [exponential_lr(x) for x in rng]\nplt.plot(rng, y)\nprint(\"Learning rate schedule: {:.3g} to {:.3g} to {:.3g}\".format(y[0], max(y), y[-1]))","metadata":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2021-08-30T20:14:06.04944Z","iopub.execute_input":"2021-08-30T20:14:06.049741Z","iopub.status.idle":"2021-08-30T20:14:06.216835Z","shell.execute_reply.started":"2021-08-30T20:14:06.049712Z","shell.execute_reply":"2021-08-30T20:14:06.216091Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# Define training epochs\nEPOCHS = 25\nSTEPS_PER_EPOCH = NUM_TRAINING_IMAGES // BATCH_SIZE\n\nhistory = model_ir2.fit(\n    ds_train,\n    validation_data=ds_valid,\n    epochs=EPOCHS,\n    steps_per_epoch=STEPS_PER_EPOCH,\n    callbacks=[lr_callback],\n)\nhistory1 = model_eb7.fit(\n    ds_train,\n    validation_data=ds_valid,\n    epochs=EPOCHS,\n    steps_per_epoch=STEPS_PER_EPOCH,\n    callbacks=[lr_callback],\n)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T20:14:06.217898Z","iopub.execute_input":"2021-08-30T20:14:06.21829Z","iopub.status.idle":"2021-08-30T21:19:57.226178Z","shell.execute_reply.started":"2021-08-30T20:14:06.218258Z","shell.execute_reply":"2021-08-30T21:19:57.225074Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"display_training_curves(\n    history.history['loss'],\n    history.history['val_loss'],\n    'loss',\n    211,\n)\ndisplay_training_curves(\n    history.history['sparse_categorical_accuracy'],\n    history.history['val_sparse_categorical_accuracy'],\n    'accuracy',\n    212,\n)\ndisplay_training_curves(\n    history1.history['loss'],\n    history1.history['val_loss'],\n    'loss',\n    211,\n)\ndisplay_training_curves(\n    history1.history['sparse_categorical_accuracy'],\n    history1.history['val_sparse_categorical_accuracy'],\n    'accuracy',\n    212,\n)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:19:57.228123Z","iopub.execute_input":"2021-08-30T21:19:57.228565Z","iopub.status.idle":"2021-08-30T21:19:58.149608Z","shell.execute_reply.started":"2021-08-30T21:19:57.228518Z","shell.execute_reply":"2021-08-30T21:19:58.146723Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\nimport matplotlib.pyplot as plt\nfrom sklearn.metrics import f1_score, precision_score, recall_score, confusion_matrix\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    ax.plot(validation)\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":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2021-08-30T21:19:58.15154Z","iopub.execute_input":"2021-08-30T21:19:58.152026Z","iopub.status.idle":"2021-08-30T21:19:58.360893Z","shell.execute_reply.started":"2021-08-30T21:19:58.151975Z","shell.execute_reply":"2021-08-30T21:19:58.359768Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"cmdataset = get_validation_dataset(ordered=True)\nimages_ds = cmdataset.map(lambda image, label: image)\nlabels_ds = cmdataset.map(lambda image, label: label).unbatch()\n\ncm_correct_labels = next(iter(labels_ds.batch(NUM_VALIDATION_IMAGES))).numpy()\ncm_probabilities_ir2 = model_ir2.predict(images_ds)\ncm_probabilities_eb7 = model_eb7.predict(images_ds)\ncm_predictions = np.argmax((cm_probabilities_ir2+cm_probabilities_eb7)/2, axis=-1)\n\nlabels = range(len(CLASSES))\ncmat = confusion_matrix(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n)\ncmat = (cmat.T / cmat.sum(axis=1)).T # normalize","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:19:58.362289Z","iopub.execute_input":"2021-08-30T21:19:58.362635Z","iopub.status.idle":"2021-08-30T21:20:45.076923Z","shell.execute_reply.started":"2021-08-30T21:19:58.362602Z","shell.execute_reply":"2021-08-30T21:20:45.075838Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"score = f1_score(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n    average='macro',\n)\nprecision = precision_score(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n    average='macro',\n)\nrecall = recall_score(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n    average='macro',\n)\nprint(f\"Precision: {precision}\\nRecall: {recall}\\nF1-score: {score}\")","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:20:45.078373Z","iopub.execute_input":"2021-08-30T21:20:45.078684Z","iopub.status.idle":"2021-08-30T21:20:45.104112Z","shell.execute_reply.started":"2021-08-30T21:20:45.07864Z","shell.execute_reply":"2021-08-30T21:20:45.102954Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"score = f1_score(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n    average='macro',\n)\nprecision = precision_score(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n    average='macro',\n)\nrecall = recall_score(\n    cm_correct_labels,\n    cm_predictions,\n    labels=labels,\n    average='macro',\n)\ndisplay_confusion_matrix(cmat, score, precision, recall)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:20:45.105384Z","iopub.execute_input":"2021-08-30T21:20:45.105711Z","iopub.status.idle":"2021-08-30T21:20:49.975182Z","shell.execute_reply.started":"2021-08-30T21:20:45.105662Z","shell.execute_reply":"2021-08-30T21:20:49.974162Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"dataset = get_validation_dataset()\ndataset = dataset.unbatch().batch(20)\nbatch = iter(dataset)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:20:49.976875Z","iopub.execute_input":"2021-08-30T21:20:49.977506Z","iopub.status.idle":"2021-08-30T21:20:50.016613Z","shell.execute_reply.started":"2021-08-30T21:20:49.977446Z","shell.execute_reply":"2021-08-30T21:20:50.015688Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"And here is a set of flowers with their predicted species. Run the cell again to see another set.","metadata":{}},{"cell_type":"code","source":"images, labels = next(batch)\nprobabilities_ir2 = model_ir2.predict(images)\nprobabilities_eb7 = model_eb7.predict(images)\npredictions = np.argmax((probabilities_ir2+probabilities_eb7)/2, axis=-1)\ndisplay_batch_of_images((images, labels), predictions)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:20:50.019665Z","iopub.execute_input":"2021-08-30T21:20:50.02Z","iopub.status.idle":"2021-08-30T21:21:17.984858Z","shell.execute_reply.started":"2021-08-30T21:20:50.019968Z","shell.execute_reply":"2021-08-30T21:21:17.983641Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"test_ds = get_test_dataset(ordered=True)\n\nprint('Computing predictions...')\ntest_images_ds = test_ds.map(lambda image, idnum: image)\nprobabilities_ir2 = model_ir2.predict(test_images_ds)\nprobabilities_eb7 = model_eb7.predict(test_images_ds)\npredictions = np.argmax((probabilities_ir2+probabilities_eb7)/2, axis=-1)\nprint(predictions)","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:21:17.986408Z","iopub.execute_input":"2021-08-30T21:21:17.986748Z","iopub.status.idle":"2021-08-30T21:22:05.592478Z","shell.execute_reply.started":"2021-08-30T21:21:17.986709Z","shell.execute_reply":"2021-08-30T21:22:05.591412Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"We'll generate a file `submission.csv`. This file is what you'll submit to get your score on the leaderboard.","metadata":{}},{"cell_type":"code","source":"print('Generating submission.csv file...')\n\n# Get image ids from test set and convert to unicode\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')\n\n# Write the submission file\nnp.savetxt(\n    'submission.csv',\n    np.rec.fromarrays([test_ids, predictions]),\n    fmt=['%s', '%d'],\n    delimiter=',',\n    header='id,label',\n    comments='',\n)\n\n# Look at the first few predictions\n!head submission.csv","metadata":{"execution":{"iopub.status.busy":"2021-08-30T21:22:05.593566Z","iopub.execute_input":"2021-08-30T21:22:05.593864Z","iopub.status.idle":"2021-08-30T21:22:11.395546Z","shell.execute_reply.started":"2021-08-30T21:22:05.593835Z","shell.execute_reply":"2021-08-30T21:22:11.39415Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"","metadata":{},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"","metadata":{},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"---\n\n\n\n\n*Have questions or comments? Visit the [Learn Discussion forum](https://www.kaggle.com/learn-forum/161321) to chat with other Learners.*","metadata":{}}]}