Kaggle competition: Petals to the Metal - Flower Classification on TPU
<SOS> metric: macrofscore Kaggle data source: petals-to-the-metal-flower-classification-on-tpu<split>
!pip install -q efficientnet
train_data, val_data = train_test_split(train_data, test_size=0.2)
 print(len(train_data), 'train examples')
 print(len(val_data), 'validation examples')
 print(len(test_data), 'test examples' )<create_dataframe>
%matplotlib inline
print("Tensorflow version " + tf.__version__ )
def df_to_dataset(df, shuffle, test, n_epochs =None):
def input_fn() :
dataframe = df.copy()
NUM_EXAMPLES = len(dataframe)
 if test:
ds = tf.data.Dataset.from_tensor_slices(dict(dataframe))
else:
labels = dataframe.pop('Survived')
 ds = tf.data.Dataset.from_tensor_slices(( dict(dataframe), labels))
if shuffle:
ds.shuffle(buffer_size=NUM_EXAMPLES)
 ds = ds.repeat(n_epochs)
 ds = ds.batch(NUM_EXAMPLES)
 return ds
return input_fn<create_dataframe>
GCS_DS_PATH = KaggleDatasets().get_gcs_path("tpu-getting-started" )
train_ds = df_to_dataset(train_data, shuffle=True, test=False)
 val_ds = df_to_dataset(val_data, shuffle=False, test=False, n_epochs=1)
 test_ds = df_to_dataset(test_data, shuffle=False, test=True, n_epochs=1 )<train_model>
IMAGE_SIZE = [512, 512]
BATCH_SIZE = 16 * strategy.num_replicas_in_sync
GCS_PATH_SELECT = {
192: GCS_DS_PATH + '/tfrecords-jpeg-192x192',
224: GCS_DS_PATH + '/tfrecords-jpeg-224x224',
331: GCS_DS_PATH + '/tfrecords-jpeg-331x331',
512: GCS_DS_PATH + '/tfrecords-jpeg-512x512'
}
GCS_PATH = GCS_PATH_SELECT[IMAGE_SIZE[0]]
VALIDATION_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/val/*.tfrec')
 TEST_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/test/*.tfrec')
 SEED = 2020
n_batches = 1
est = tf.estimator.BoostedTreesClassifier(feature_columns,
n_batches_per_layer=n_batches)
 est.train(train_ds, max_steps=100)
 result = est.evaluate(val_ds)
 clear_output()
print(pd.Series(result))<predict_on_test>
def decode_image(image_data):

 image = tf.image.decode_jpeg(image_data, channels=3)
 image = tf.cast(image, tf.float32)/ 255.0
image = tf.reshape(image, [*IMAGE_SIZE, 3])
 return image
def read_labeled_tfrecord(example):
LABELED_TFREC_FORMAT = {
"image": tf.io.FixedLenFeature([], tf.string),
"class": tf.io.FixedLenFeature([], tf.int64),
}
example = tf.io.parse_single_example(example, LABELED_TFREC_FORMAT)
 image = decode_image(example['image'])
 label = tf.cast(example['class'], tf.int32)
 return image, label
def read_unlabeled_tfrecord(example):
UNLABELED_TFREC_FORMAT = {
"image": tf.io.FixedLenFeature([], tf.string),
"id": tf.io.FixedLenFeature([], tf.string),
}
example = tf.io.parse_single_example(example, UNLABELED_TFREC_FORMAT)
 image = decode_image(example['image'])
 idnum = example['id']
return image, idnum
def load_dataset(filenames, labeled=True, ordered=False):

 ignore_order = tf.data.Options()
if not ordered:
ignore_order.experimental_deterministic = False
dataset = tf.data.TFRecordDataset(filenames, num_parallel_reads=AUTO)
 dataset = dataset.with_options(ignore_order)
 dataset = dataset.map(read_labeled_tfrecord if labeled else read_unlabeled_tfrecord, num_parallel_calls=AUTO)
 return dataset
def get_validation_dataset() :
dataset = load_dataset(VALIDATION_FILENAMES, labeled=True, ordered=True)
 dataset = dataset.batch(BATCH_SIZE)
 dataset = dataset.cache()
dataset = dataset.prefetch(AUTO)
 return dataset
def get_test_dataset(ordered=False):
dataset = load_dataset(TEST_FILENAMES, labeled=False, ordered=ordered)
 dataset = dataset.batch(BATCH_SIZE)
 dataset = dataset.prefetch(AUTO)
 return dataset
def count_data_items(filenames):
n = [int(re.compile(r"-([0-9]*)\." ).search(filename ).group(1)) for filename in filenames]
return np.sum(n)
 NUM_VALIDATION_IMAGES = count_data_items(VALIDATION_FILENAMES)
 NUM_TEST_IMAGES = count_data_items(TEST_FILENAMES)
 print('Dataset: {} validation images, {} unlabeled test images'.format(NUM_VALIDATION_IMAGES, NUM_TEST_IMAGES))
predictions = est.predict(test_ds)
 probs = pd.Series([pred['probabilities'][1] for pred in predictions])
 print(probs)
 predictions =(probs >= 0.5 ).astype(int )<create_dataframe>
def get_model(use_model):
base_model = use_model(weights='imagenet',
include_top=False, pooling='avg',
input_shape=(*IMAGE_SIZE, 3))
x = base_model.output
predictions = Dense(104, activation='softmax' )(x)
 model = Model(inputs=base_model.input, outputs=predictions)
 model.compile(
 optimizer='nadam',
loss = 'sparse_categorical_crossentropy',
metrics=['sparse_categorical_accuracy'] 
)
 return model
with strategy.scope() :
model1 = get_model(EfficientNetB7)
 model1.load_weights("/kaggle/input/more-data-with-efficientnetb7/my_ef_net_b7.h5" )
predictions_dataframe = test_data[["PassengerId"]]
predictions_dataframe["Survived"] = predictions<save_to_csv>
def get_model(use_model):
base_model = use_model(weights='imagenet',
include_top=False, pooling='avg',
input_shape=(*IMAGE_SIZE, 3))
x = base_model.output
predictions = Dense(104, activation='softmax' )(x)
 model = Model(inputs=base_model.input, outputs=predictions)
 model.compile(
 optimizer='nadam',
loss = 'sparse_categorical_crossentropy',
metrics=['sparse_categorical_accuracy'] 
)
 return model
with strategy.scope() :
model2 = get_model(VGG19)
 model2.load_weights("/kaggle/input/start-with-pre-train/my_ef_net_b7.h5" )
predictions_dataframe.to_csv("my_submission.csv",index=False )<load_from_csv>
val_dataset = get_validation_dataset()
images_ds = val_dataset.map(lambda image, label: image)
 labels_ds = val_dataset.map(lambda image, label: label ).unbatch()
val_labels = next(iter(labels_ds.batch(NUM_VALIDATION_IMAGES)) ).numpy()
m1 = model1.predict(images_ds)
 m2 = model2.predict(images_ds)
 scores = []
for alpha in np.linspace(0,1,100):
val_probabilities = alpha*m1+(1-alpha)*m2
val_predictions = np.argmax(val_probabilities, axis=-1)
 scores.append(f1_score(val_labels, val_predictions, labels=range(104), average='macro'))
best_alpha = np.argmax(scores)/100
print('Best alpha: ' + str(best_alpha))
<count_missing_values><EOS> 
test_ds = get_test_dataset(ordered=True)
 best_alpha = 0.48
print('Вычисляем предсказания...')
 test_images_ds = test_ds.map(lambda image, idnum: image)
 probabilities1 = model1.predict(test_images_ds)
 probabilities2 = model2.predict(test_images_ds)
 probabilities = best_alpha * probabilities1 +(1 - best_alpha)* probabilities2
predictions = np.argmax(probabilities, axis=-1)
 print(predictions)
 print('Создание файла submission.csv...')
 test_ids_ds = test_ds.map(lambda image, idnum: idnum ).unbatch()
test_ids = next(iter(test_ids_ds.batch(NUM_TEST_IMAGES)) ).numpy().astype('U')
 np.savetxt('submission.csv', np.rec.fromarrays([test_ids, predictions]), fmt=['%s', '%d'], delimiter=',', header='id,label', comments='' )