{"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"name":"python","version":"3.10.13","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"},{"sourceId":37130068,"sourceType":"kernelVersion"},{"sourceId":629,"sourceType":"modelInstanceVersion","modelInstanceId":496}],"isInternetEnabled":true,"language":"python","sourceType":"notebook","isGpuEnabled":true}},"nbformat_minor":4,"nbformat":4,"cells":[{"cell_type":"code","source":"import math, re, os\nimport numpy as np\nimport tensorflow as tf\nfrom __future__ import absolute_import, division, print_function\n\nfrom IPython.display import Image as IImage, display\nimport numpy as np\nimport PIL\nfrom PIL import Image\nimport random\nimport requests\nimport tensorflow as tf\nprint(\"Tensorflow version \" + tf.__version__)","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:12.375729Z","iopub.execute_input":"2024-03-31T12:47:12.376294Z","iopub.status.idle":"2024-03-31T12:47:24.575272Z","shell.execute_reply.started":"2024-03-31T12:47:12.376262Z","shell.execute_reply":"2024-03-31T12:47:24.574356Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"import random\nimport os\nimport glob\nimport time\n\nimport pandas as pd\nimport numpy as np\nimport matplotlib.pyplot as plt\nimport seaborn as sns\n\nimport tensorflow as tf\nimport tensorflow_hub as hub\nfrom tensorflow.keras import layers, Sequential\nfrom tensorflow.keras.utils import plot_model\n\nfrom sklearn.model_selection import train_test_split\nfrom sklearn.metrics import classification_report, precision_recall_fscore_support\nfrom sklearn.metrics import accuracy_score, f1_score, matthews_corrcoef\nfrom sklearn.metrics import confusion_matrix, ConfusionMatrixDisplay\n#from scikitplot.metrics import plot_roc\n#from vit_keras import vit","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:24.577424Z","iopub.execute_input":"2024-03-31T12:47:24.578222Z","iopub.status.idle":"2024-03-31T12:47:26.622691Z","shell.execute_reply.started":"2024-03-31T12:47:24.578184Z","shell.execute_reply":"2024-03-31T12:47:26.621892Z"},"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":"2024-03-31T12:47:26.623707Z","iopub.execute_input":"2024-03-31T12:47:26.624220Z","iopub.status.idle":"2024-03-31T12:47:26.632160Z","shell.execute_reply.started":"2024-03-31T12:47:26.624195Z","shell.execute_reply":"2024-03-31T12:47:26.631287Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"from kaggle_datasets import KaggleDatasets\n\nGCS_DS_PATH = '/kaggle/input/tpu-getting-started'\nprint(GCS_DS_PATH) # what do gcs paths look like?","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:26.634375Z","iopub.execute_input":"2024-03-31T12:47:26.634637Z","iopub.status.idle":"2024-03-31T12:47:26.646025Z","shell.execute_reply.started":"2024-03-31T12:47:26.634613Z","shell.execute_reply":"2024-03-31T12:47:26.645173Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"IMAGE_SIZE = [331, 331]\nGCS_PATH = GCS_DS_PATH + '/tfrecords-jpeg-331x331'\nAUTO = tf.data.experimental.AUTOTUNE\n\nIMAGE_SIZE = [331, 331] # at this size, a GPU will run out of memory. Use the TPU\nEPOCHS = 20\nBATCH_SIZE = 16 * strategy.num_replicas_in_sync#用于设置批量大小，并且根据 TensorFlow 中的分布式策略 (strategy.num_replicas_in_sync) 进行了调整\n\nNUM_TRAINING_IMAGES = 12753\nNUM_TEST_IMAGES = 7382\nSTEPS_PER_EPOCH = NUM_TRAINING_IMAGES // BATCH_SIZE\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","metadata":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2024-03-31T12:47:26.647163Z","iopub.execute_input":"2024-03-31T12:47:26.647477Z","iopub.status.idle":"2024-03-31T12:47:26.694649Z","shell.execute_reply.started":"2024-03-31T12:47:26.647453Z","shell.execute_reply":"2024-03-31T12:47:26.693761Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"def random_flip_left_right(image):\n    return tf.image.random_flip_left_right(image)\ndef random_contrast(image, minval=0.6, maxval=1.4):\n    r = tf.random.uniform([], minval=minval, maxval=maxval)\n    image = tf.image.adjust_contrast(image, contrast_factor=r)\n    return tf.cast(image, tf.uint8)\n# Randomly change an image brightness\ndef random_brightness(image, minval=0., maxval=.2):\n    r = tf.random.uniform([], minval=minval, maxval=maxval)\n    image = tf.image.adjust_brightness(image, delta=r)\n    return tf.cast(image, tf.uint8)\n# Randomly change an image saturation\ndef random_saturation(image, minval=0.4, maxval=2.):\n    r = tf.random.uniform((), minval=minval, maxval=maxval)\n    image = tf.image.adjust_saturation(image, saturation_factor=r)\n    return tf.cast(image, tf.uint8)\n# Randomly change an image hue.\ndef random_hue(image, minval=-0.04, maxval=0.08):\n    r = tf.random.uniform((), minval=minval, maxval=maxval)\n    image = tf.image.adjust_hue(image, delta=r)\n    return tf.cast(image, tf.uint8)\n# Distort an image by cropping it with a different aspect ratio.\ndef distorted_random_crop(image,\n                min_object_covered=0.1,\n                aspect_ratio_range=(3./4., 4./3.),\n                area_range=(0.06, 1.0),\n                max_attempts=100,\n                scope=None):\n\n    cropbox = tf.constant([0.0, 0.0, 1.0, 1.0], dtype=tf.float32, shape=[1, 1, 4])\n    sample_distorted_bounding_box = tf.image.sample_distorted_bounding_box(\n        tf.shape(image),\n        bounding_boxes=cropbox,\n        min_object_covered=min_object_covered,\n        aspect_ratio_range=aspect_ratio_range,\n        area_range=area_range,\n        max_attempts=max_attempts,\n        use_image_if_no_bounding_boxes=True)\n    bbox_begin, bbox_size, distort_bbox = sample_distorted_bounding_box\n\n    # Crop the image to the specified bounding box.\n    cropped_image = tf.slice(image, bbox_begin, bbox_size)\n    return cropped_image\n# Apply all transformations to an image.\n# That is a common image augmentation technique for image datasets, such as ImageNet.\ndef transform_image(image):\n    #image = distorted_random_crop(image)\n    #image = random_flip_left_right(image)\n    #image = random_contrast(image)\n    #image = random_brightness(image)\n    #image = random_hue(image)\n    #image = random_saturation(image)\n    return image\n# Resize transformed image to a 331x331px square image, ready for training.\ndef resize_image(image):\n    image = tf.image.resize(image, size=(331, 331), preserve_aspect_ratio=False)\n    image = tf.cast(image, tf.uint8)\n    return image","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:26.695791Z","iopub.execute_input":"2024-03-31T12:47:26.696140Z","iopub.status.idle":"2024-03-31T12:47:26.709672Z","shell.execute_reply.started":"2024-03-31T12:47:26.696089Z","shell.execute_reply":"2024-03-31T12:47:26.708782Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\n\ndef data_augment(image, label):\n    # Thanks to the dataset.prefetch(AUTO)\n    # statement in the next function (below), this happens essentially\n    # for free on TPU. Data pipeline code is executed on the \"CPU\"\n    # part of the TPU while the TPU itself is computing gradients.\n    # Display fully pre-processed image.\n    #image = np.array(image)\n    transformed_img = transform_image(image)\n    \n    return image, label   \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.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))\ntraining_dataset = get_training_dataset()\nvalidation_dataset = get_validation_dataset()\ntest_dataset = get_test_dataset()","metadata":{"_kg_hide-input":true,"execution":{"iopub.status.busy":"2024-03-31T12:47:26.710624Z","iopub.execute_input":"2024-03-31T12:47:26.710956Z","iopub.status.idle":"2024-03-31T12:47:27.672052Z","shell.execute_reply.started":"2024-03-31T12:47:26.710913Z","shell.execute_reply":"2024-03-31T12:47:27.671246Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\n# 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":"2024-03-31T12:47:27.673368Z","iopub.execute_input":"2024-03-31T12:47:27.673844Z","iopub.status.idle":"2024-03-31T12:47:27.771292Z","shell.execute_reply.started":"2024-03-31T12:47:27.673806Z","shell.execute_reply":"2024-03-31T12:47:27.770289Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\nnp.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":"2024-03-31T12:47:27.772421Z","iopub.execute_input":"2024-03-31T12:47:27.772732Z","iopub.status.idle":"2024-03-31T12:47:30.161675Z","shell.execute_reply.started":"2024-03-31T12:47:27.772706Z","shell.execute_reply":"2024-03-31T12:47:30.160778Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"\nprint(\"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":"2024-03-31T12:47:30.165508Z","iopub.execute_input":"2024-03-31T12:47:30.165835Z","iopub.status.idle":"2024-03-31T12:47:30.307316Z","shell.execute_reply.started":"2024-03-31T12:47:30.165810Z","shell.execute_reply":"2024-03-31T12:47:30.306376Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"from 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":"2024-03-31T12:47:30.308445Z","iopub.execute_input":"2024-03-31T12:47:30.308732Z","iopub.status.idle":"2024-03-31T12:47:30.328439Z","shell.execute_reply.started":"2024-03-31T12:47:30.308706Z","shell.execute_reply":"2024-03-31T12:47:30.327357Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"ds_iter = iter(ds_train.unbatch().batch(20))","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:30.329712Z","iopub.execute_input":"2024-03-31T12:47:30.330057Z","iopub.status.idle":"2024-03-31T12:47:30.375362Z","shell.execute_reply.started":"2024-03-31T12:47:30.330023Z","shell.execute_reply":"2024-03-31T12:47:30.374587Z"},"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":"2024-03-31T12:47:30.376448Z","iopub.execute_input":"2024-03-31T12:47:30.376719Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"with strategy.scope():\n    pretrained_model = tf.keras.applications.xception.Xception(\n        weights='imagenet',\n        include_top=False ,\n        input_shape=[*IMAGE_SIZE, 3]\n    )\n    pretrained_model.trainable = False\n    \n    model = 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    ])","metadata":{"execution":{"iopub.execute_input":"2024-03-31T12:47:34.652225Z","iopub.status.idle":"2024-03-31T12:47:40.273092Z","shell.execute_reply.started":"2024-03-31T12:47:34.652182Z","shell.execute_reply":"2024-03-31T12:47:40.272138Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"model.compile(\n    optimizer='adam',\n    loss = 'sparse_categorical_crossentropy',\n    metrics=['sparse_categorical_accuracy'],\n)\n\nmodel.summary()","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:40.274396Z","iopub.execute_input":"2024-03-31T12:47:40.274759Z","iopub.status.idle":"2024-03-31T12:47:40.307740Z","shell.execute_reply.started":"2024-03-31T12:47:40.274727Z","shell.execute_reply":"2024-03-31T12:47:40.306820Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# 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)\n\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":"2024-03-31T12:47:40.309059Z","iopub.execute_input":"2024-03-31T12:47:40.309458Z","iopub.status.idle":"2024-03-31T12:47:40.604154Z","shell.execute_reply.started":"2024-03-31T12:47:40.309426Z","shell.execute_reply":"2024-03-31T12:47:40.603261Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"!pip show tensorflow","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:40.605647Z","iopub.execute_input":"2024-03-31T12:47:40.606018Z","iopub.status.idle":"2024-03-31T12:47:53.296769Z","shell.execute_reply.started":"2024-03-31T12:47:40.605964Z","shell.execute_reply":"2024-03-31T12:47:53.295653Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"with strategy.scope():    \n    pretrained_model = tf.keras.applications.xception.Xception(weights='imagenet', include_top=False ,input_shape=[*IMAGE_SIZE, 3])\n    pretrained_model.trainable = False # tramsfer learning\n\n    model = tf.keras.Sequential([\n        pretrained_model,\n        tf.keras.layers.GlobalAveragePooling2D(),\n        tf.keras.layers.Dense(104, activation='softmax')\n    ])\n        \nmodel.compile(\n    optimizer='adam',\n    loss = 'sparse_categorical_crossentropy',\n    metrics=['sparse_categorical_accuracy']\n)\n\nhistorical = model.fit(training_dataset, \n          steps_per_epoch=STEPS_PER_EPOCH, \n          epochs=EPOCHS, \n          validation_data=validation_dataset)","metadata":{"execution":{"iopub.status.busy":"2024-03-31T12:47:53.298448Z","iopub.execute_input":"2024-03-31T12:47:53.299263Z","iopub.status.idle":"2024-03-31T13:14:21.029240Z","shell.execute_reply.started":"2024-03-31T12:47:53.299220Z","shell.execute_reply":"2024-03-31T13:14:21.028403Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"cmdataset = get_validation_dataset(ordered=True)\nimages_ds = cmdataset.map(lambda image, label: image)\n#labels_ds = cmdataset.map(lambda image, label: label).unbatch()\nfor image_batch in images_ds.take(1):\n    predictions = model.predict(image_batch)\n    print(\"Sum of probabilities for a single prediction:\", np.sum(predictions[0]))\nfor image_batch in images_ds.take(1):\n    print(image_batch.shape)  # 应该与模型输入层的形状相匹配\nfor image_batch in images_ds.take(1):\n    predictions = model.predict(image_batch)\n    print(predictions.shape)  # 输出形状应该是 (batch_size, num_classes)\n    print(predictions)        # 查看预测的概率分布\nfor image_batch in images_ds.take(1):\n    predictions = model.predict(image_batch)\n    predicted_classes = np.argmax(predictions, axis=-1)\n    print(predicted_classes)  # 查看预测的类别索引\npredictions = model.predict(image_batch)\npredictions","metadata":{"execution":{"iopub.status.busy":"2024-03-31T13:14:21.030395Z","iopub.execute_input":"2024-03-31T13:14:21.030679Z","iopub.status.idle":"2024-03-31T13:14:24.626754Z","shell.execute_reply.started":"2024-03-31T13:14:21.030654Z","shell.execute_reply":"2024-03-31T13:14:24.625863Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"display_training_curves(\n    historical.history['loss'],\n    historical.history['val_loss'],\n    'loss',\n    211,\n)\ndisplay_training_curves(\n    historical.history['sparse_categorical_accuracy'],\n    historical.history['val_sparse_categorical_accuracy'],\n    'accuracy',\n    212,\n)","metadata":{"execution":{"iopub.status.busy":"2024-03-31T13:14:24.627902Z","iopub.execute_input":"2024-03-31T13:14:24.628281Z","iopub.status.idle":"2024-03-31T13:14:25.328822Z","shell.execute_reply.started":"2024-03-31T13:14:24.628252Z","shell.execute_reply":"2024-03-31T13:14:25.327902Z"},"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":"2024-03-31T13:14:25.329958Z","iopub.execute_input":"2024-03-31T13:14:25.330254Z","iopub.status.idle":"2024-03-31T13:14:25.342071Z","shell.execute_reply.started":"2024-03-31T13:14:25.330229Z","shell.execute_reply":"2024-03-31T13:14:25.341205Z"},"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 = model.predict(images_ds)\ncm_predictions = np.argmax(cm_probabilities, 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":"2024-03-31T13:14:25.343232Z","iopub.execute_input":"2024-03-31T13:14:25.343492Z","iopub.status.idle":"2024-03-31T13:14:46.944323Z","shell.execute_reply.started":"2024-03-31T13:14:25.343469Z","shell.execute_reply":"2024-03-31T13:14:46.943536Z"},"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":"2024-03-31T13:14:46.945406Z","iopub.execute_input":"2024-03-31T13:14:46.945660Z"},"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 = model.predict(test_images_ds)\npredictions = np.argmax(probabilities, axis=-1)\nprint(predictions)","metadata":{"execution":{"iopub.status.busy":"2024-03-31T13:15:07.832904Z","iopub.execute_input":"2024-03-31T13:15:07.833242Z","iopub.status.idle":"2024-03-31T13:15:43.565296Z","shell.execute_reply.started":"2024-03-31T13:15:07.833213Z","shell.execute_reply":"2024-03-31T13:15:43.564342Z"},"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":"2024-03-31T13:15:43.567002Z","iopub.execute_input":"2024-03-31T13:15:43.567831Z","iopub.status.idle":"2024-03-31T13:15:48.788292Z","shell.execute_reply.started":"2024-03-31T13:15:43.567793Z","shell.execute_reply":"2024-03-31T13:15:48.786962Z"},"trusted":true},"execution_count":null,"outputs":[]},{"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)\npredictions = np.argmax(probabilities, axis=-1)\nprint(predictions)","metadata":{"execution":{"iopub.status.busy":"2024-03-31T13:15:48.794448Z","iopub.execute_input":"2024-03-31T13:15:48.794783Z","iopub.status.idle":"2024-03-31T13:16:23.648503Z","shell.execute_reply.started":"2024-03-31T13:15:48.794753Z","shell.execute_reply":"2024-03-31T13:16:23.647488Z"},"trusted":true},"execution_count":null,"outputs":[]}]}