def get_classification_data_loaders():
x_train = np.random.rand(200, 28, 28, 3)
y_train = np.random.rand(200, 3)
x_test = np.random.rand(190, 28, 28, 3)
y_test = np.random.rand(190, 3)
data_transformer = ImageDataTransformer(x_train, augment=True)
train_data = data_transformer.transform_train(x_train, y_train)
test_data = data_transformer.transform_test(x_test, y_test)
return train_data, test_data
class PredefinedModel(SingleModelSupervised):
"""The base class for the predefined model without architecture search
Attributes:
graph: The graph form of the model.
y_encoder: Label encoder, used in transform_y or inverse_transform_y for encode the label. For example,
if one hot encoder needed, y_encoder can be OneHotEncoder.
data_transformer: A instance of transformer to process the data, See example as ImageDataTransformer.
verbose: A boolean of whether the search process will be printed to stdout.
path: A string. The path to a directory, where the intermediate results are saved.
"""
def __init__(self, y_encoder=OneHotEncoder(), data_transformer=None, verbose=False, path=None):
super().__init__(verbose, path)
self.graph = None
self.generator = None
self.y_encoder = y_encoder
self.data_transformer = data_transformer
@abstractmethod
def _init_generator(self, n_output_node, input_shape):
"""Initialize the generator to generate the model architecture.
Args:
n_output_node: A integer value represent the number of output node in the final layer.
input_shape: A tuple to express the shape of every train entry.
"""
pass
@property
def loss(self):
return classification_loss
@property
def metric(self):
return Accuracy
def preprocess(self, x):
return resize_image_data(x, self.resize_shape)
def transform_y(self, y_train):
return self.y_encoder.transform(y_train)
def inverse_transform_y(self, output):
return self.y_encoder.inverse_transform(output)
def fit(self, x, y, trainer_args=None):
"""Trains the model on the dataset given.
Args:
x: A numpy.ndarray instance containing the training data or the training data combined with the
validation data.
y: A numpy.ndarray instance containing the label of the training data. or the label of the training data
combined with the validation label.
trainer_args: A dictionary containing the parameters of the ModelTrainer constructor.
"""
validate_xy(x, y)
self.resize_shape = compute_image_resize_params(x)
x = self.preprocess(x)
self.y_encoder.fit(y)
y = self.transform_y(y)
# Divide training data into training and testing data.
validation_set_size = int(len(y) * Constant.VALIDATION_SET_SIZE)
validation_set_size = min(validation_set_size, 500)
validation_set_size = max(validation_set_size, 1)
x_train, x_test, y_train, y_test = train_test_split(x, y,
test_size=validation_set_size,
random_state=42)
# initialize data_transformer
self.data_transformer = ImageDataTransformer(x_train)
# Wrap the data into DataLoaders
train_loader = self.data_transformer.transform_train(x_train, y_train)
test_loader = self.data_transformer.transform_test(x_test, y_test)
self.generator = self._init_generator(self.y_encoder.n_classes, x_train.shape[1:])
graph = self.generator.generate()
if trainer_args is None:
trainer_args = {'max_no_improvement_num': 30}
_, _1, self.graph = train(None, graph, train_loader, test_loader,
trainer_args, self.metric, self.loss,
self.verbose, self.path)
class ImageSupervised(Supervised):
"""The image classifier class.
It is used for image classification. It searches convolutional neural network architectures
for the best configuration for the dataset.
Attributes:
path: A path to the directory to save the classifier.
y_encoder: An instance of OneHotEncoder for `y_train` (array of categorical labels).
verbose: A boolean value indicating the verbosity mode.
searcher: An instance of BayesianSearcher. It searches different
neural architecture to find the best model.
searcher_args: A dictionary containing the parameters for the searcher's __init__ function.
augment: A boolean value indicating whether the data needs augmentation. If not define, then it
will use the value of Constant.DATA_AUGMENTATION which is True by default.
"""
def __init__(self,
verbose=False,
path=None,
resume=False,
searcher_args=None,
augment=None):
"""Initialize the instance.
The classifier will be loaded from the files in 'path' if parameter 'resume' is True.
Otherwise it would create a new one.
Args:
verbose: A boolean of whether the search process will be printed to stdout.
path: A string. The path to a directory, where the intermediate results are saved.
resume: A boolean. If True, the classifier will continue to previous work saved in path.
Otherwise, the classifier will start a new search.
augment: A boolean value indicating whether the data needs augmentation. If not define, then it
will use the value of Constant.DATA_AUGMENTATION which is True by default.
"""
super().__init__(verbose)
if searcher_args is None:
searcher_args = {}
if path is None:
path = temp_folder_generator()
self.cnn = CnnModule(self.loss, self.metric, searcher_args, path,
verbose)
if augment is None:
augment = Constant.DATA_AUGMENTATION
self.path = path
if has_file(os.path.join(self.path, 'classifier')) and resume:
classifier = pickle_from_file(os.path.join(self.path,
'classifier'))
self.__dict__ = classifier.__dict__
else:
self.y_encoder = None
self.data_transformer = None
self.verbose = verbose
self.augment = augment
@property
@abstractmethod
def metric(self):
pass
@property
@abstractmethod
def loss(self):
pass
def fit(self, x, y, x_test=None, y_test=None, time_limit=None):
x = np.array(x)
y = np.array(y).flatten()
validate_xy(x, y)
y = self.transform_y(y)
if x_test is None or y_test is None:
# Divide training data into training and testing data.
validation_set_size = int(len(y) * Constant.VALIDATION_SET_SIZE)
validation_set_size = min(validation_set_size, 500)
validation_set_size = max(validation_set_size, 1)
x_train, x_test, y_train, y_test = train_test_split(
x, y, test_size=validation_set_size, random_state=42)
else:
x_train = x
y_train = y
# Transform x_train
if self.data_transformer is None:
self.data_transformer = ImageDataTransformer(x,
augment=self.augment)
# Wrap the data into DataLoaders
train_data = self.data_transformer.transform_train(x_train, y_train)
test_data = self.data_transformer.transform_test(x_test, y_test)
# Save the classifier
pickle.dump(self, open(os.path.join(self.path, 'classifier'), 'wb'))
pickle_to_file(self, os.path.join(self.path, 'classifier'))
if time_limit is None:
time_limit = 24 * 60 * 60
self.cnn.fit(self.get_n_output_node(), x_train.shape, train_data,
test_data, time_limit)
@abstractmethod
def get_n_output_node(self):
pass
def transform_y(self, y_train):
return y_train
def predict(self, x_test):
"""Return predict results for the testing data.
Args:
x_test: An instance of numpy.ndarray containing the testing data.
Returns:
A numpy.ndarray containing the results.
"""
if Constant.LIMIT_MEMORY:
pass
test_loader = self.data_transformer.transform_test(x_test)
model = self.cnn.best_model.produce_model()
model.eval()
outputs = []
with torch.no_grad():
for index, inputs in enumerate(test_loader):
outputs.append(model(inputs).numpy())
output = reduce(lambda x, y: np.concatenate((x, y)), outputs)
return self.inverse_transform_y(output)
def inverse_transform_y(self, output):
return output
def evaluate(self, x_test, y_test):
"""Return the accuracy score between predict value and `y_test`."""
y_predict = self.predict(x_test)
return self.metric().evaluate(y_test, y_predict)
def final_fit(self,
x_train,
y_train,
x_test,
y_test,
trainer_args=None,
retrain=False):
"""Final training after found the best architecture.
Args:
x_train: A numpy.ndarray of training data.
y_train: A numpy.ndarray of training targets.
x_test: A numpy.ndarray of testing data.
y_test: A numpy.ndarray of testing targets.
trainer_args: A dictionary containing the parameters of the ModelTrainer constructor.
retrain: A boolean of whether reinitialize the weights of the model.
"""
if trainer_args is None:
trainer_args = {'max_no_improvement_num': 30}
y_train = self.transform_y(y_train)
y_test = self.transform_y(y_test)
train_data = self.data_transformer.transform_train(x_train, y_train)
test_data = self.data_transformer.transform_test(x_test, y_test)
self.cnn.final_fit(train_data, test_data, trainer_args, retrain)
def load_searcher(self):
return pickle_from_file(os.path.join(self.path, 'searcher'))
def export_keras_model(self, model_file_name):
""" Exports the best Keras model to the given filename. """
self.cnn.best_model.produce_keras_model().save(model_file_name)
def export_autokeras_model(self, model_file_name):
""" Creates and Exports the AutoKeras model to the given filename. """
portable_model = PortableImageSupervised(
graph=self.cnn.best_model,
y_encoder=self.y_encoder,
data_transformer=self.data_transformer,
metric=self.metric,
inverse_transform_y_method=self.inverse_transform_y)
pickle_to_file(portable_model, model_file_name)
def transform_y(y_train):
# Transform y_train.
y_encoder = OneHotEncoder()
y_encoder.fit(y_train)
y_train = y_encoder.transform(y_train)
return y_train, y_encoder
if __name__ == '__main__':
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = x_train.reshape(x_train.shape + (1,))
x_test = x_test.reshape(x_test.shape + (1,))
y_train, y_encoder = transform_y(y_train)
y_test, _ = transform_y(y_test)
cnnModule = CnnModule(loss=classification_loss, metric=Accuracy, searcher_args={}, verbose=True)
# specify the fit args
data_transformer = ImageDataTransformer(x_train, augment=True)
train_data = data_transformer.transform_train(x_train, y_train)
test_data = data_transformer.transform_test(x_test, y_test)
fit_args = {
"n_output_node": y_encoder.n_classes,
"input_shape": x_train.shape,
"train_data": train_data,
"test_data": test_data
}
cnnModule.fit(n_output_node=fit_args.get("n_output_node"),
input_shape=fit_args.get("input_shape"),
train_data=fit_args.get("train_data"),
test_data=fit_args.get("test_data"),
time_limit=24 * 60 * 60)
class VideoClassifier(Supervised):
def __init__(self):
super().__init__(verbose=False)
self.labels = None
self.net = None
self.augment = None
self.Length = 3
self.Width = 4
self.Epochs = 10
self.encoder = OneHotEncoder()
self.path = '../temp'
self.capacity = 50
def evaluate(self, x_test, y_test):
y_predict = self.predict(x_test)
return self.metric().evaluate(y_test, y_predict)
def predict(self, x_test):
classifier = pickle_from_file(os.path.join(self.path, 'classifier'))
self.__dict__ = classifier.__dict__
self.net.eval()
test_data = self.preprocess(x_test)
test_data = self.data_transformer.transform_test(test_data)
outputs = []
with torch.no_grad():
for index, inputs in enumerate(test_data):
outputs.append(self.net(inputs).numpy())
output = reduce(lambda x, y: np.concatenate((x, y)), outputs)
predicted = self.encoder.inverse_transform(output)
return predicted
def fit(self, x_train=None, y_train=None, time_limit=60 * 60 * 6):
end_time = time.time() + time_limit
x_train = self.preprocess(x_train)
x_train, x_valid, y_train, y_valid = train_test_split(x_train,
y_train,
test_size=0.25,
shuffle=True)
x_train, y_train = np.array(x_train), np.array(y_train)
x_valid, y_valid = np.array(x_valid), np.array(y_valid)
self.encoder.fit(y_train)
y_train = self.encoder.transform(y_train)
y_valid = self.encoder.transform(y_valid)
self.data_transformer = ImageDataTransformer(x_train,
augment=self.augment)
train_data = self.data_transformer.transform_train(x_train,
y_train,
batch_size=1)
test_data = self.data_transformer.transform_test(x_valid,
y_valid,
batch_size=1)
y_valid = self.encoder.inverse_transform(y_valid)
visited = set()
pq = []
trainingQ = [(self.Length, self.Width, self.Epochs)]
accuracy = 0.0
while trainingQ:
for len, width, epoch in trainingQ:
if time.time() < end_time and (len, width,
epoch) not in visited:
visited.add((len, width, epoch))
try:
net = CnnGenerator(self.encoder.n_classes, x_train.shape[1:])\
.generate(model_len=len, model_width=width).produce_model()
model_trainer = ModelTrainer(
net,
path=self.path,
loss_function=classification_loss,
metric=Accuracy,
train_data=train_data,
test_data=test_data,
verbose=True)
model_trainer.train_model(epoch, 3)
outputs = []
with torch.no_grad():
for index, (inputs, _) in enumerate(test_data):
outputs.append(net(inputs).numpy())
output = reduce(lambda x, y: np.concatenate((x, y)),
outputs)
pred_valid = self.encoder.inverse_transform(output)
accu = self.metric().evaluate(y_valid, pred_valid)
print("Accuracy: ", accu, " Parameters: ", len, width,
epoch)
pq.append((-accu, (len, width, epoch)))
if pq.__len__() > self.capacity:
heapq.heapify(pq)
pq.remove(heapq.nlargest(1, pq)[0])
if accu > accuracy:
self.Epochs = epoch
self.Length = len
self.Width = width
accuracy = accu
except Exception as e:
print(e)
if not pq:
break
heapq.heapify(pq)
_, (nexlen, nexwidth, nexepoch) = heapq.heappop(pq)
# Create children
trainingQ = []
trainingQ.append((nexlen + 1, nexwidth, nexepoch))
trainingQ.append((nexlen, nexwidth * 2, nexepoch))
trainingQ.append((nexlen, nexwidth, nexepoch + 5))
trainingQ.append((nexlen + 2, nexwidth, nexepoch + 3))
trainingQ.append((nexlen, nexwidth * 2, nexepoch + 2))
trainingQ.append((nexlen + 1, nexwidth, nexepoch + 3))
print('Finished Fit')
print("Optimal Conv3D Network Parameters:")
print("Number of Layers (Length):", self.Length)
print("Number of Filters (Width):", self.Width)
print("Number of Epochs", self.Epochs)
print()
def final_fit(self,
x_train,
y_train,
x_test,
y_test,
trainer_args=None,
retrain=True):
x_train = self.preprocess(x_train)
x_test = self.preprocess(x_test)
self.encoder.fit(y_train)
y_train = self.encoder.transform(y_train)
y_test = self.encoder.transform(y_test)
self.data_transformer = ImageDataTransformer(x_train,
augment=self.augment)
train_data = self.data_transformer.transform_train(x_train,
y_train,
batch_size=1)
test_data = self.data_transformer.transform_test(x_test,
y_test,
batch_size=1)
self.net = CnnGenerator(self.encoder.n_classes, x_train.shape[1:]) \
.generate(model_len=self.Length, model_width=self.Width).produce_model()
pickle_to_file(self, os.path.join(self.path, 'classifier'))
self.model_trainer = ModelTrainer(self.net,
path=self.path,
loss_function=classification_loss,
metric=Accuracy,
train_data=train_data,
test_data=test_data,
verbose=True)
self.model_trainer.train_model(self.Epochs, 3)
print('Finished Final Fit')
def preprocess(self, data):
result = []
for video in data:
clip = np.array([
resize(frame, output_shape=(112, 200), preserve_range=True)
for frame in video
])
clip = clip[:, :, 44:44 + 112, :] # crop centrally
result.append(clip)
result = np.array(result)
return result
@property
def metric(self):
return Accuracy
y_encoder.fit(y_train)
y_train = y_encoder.transform(y_train)
return y_train, y_encoder
if __name__ == '__main__':
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = x_train.reshape(x_train.shape + (1, ))
x_test = x_test.reshape(x_test.shape + (1, ))
y_train, y_encoder = transform_y(y_train)
y_test, _ = transform_y(y_test)
cnnModule = CnnModule(loss=classification_loss,
metric=Accuracy,
searcher_args={},
verbose=True)
# specify the fit args
data_transformer = ImageDataTransformer(x_train, augment=True)
train_data = data_transformer.transform_train(x_train, y_train)
test_data = data_transformer.transform_test(x_test, y_test)
fit_args = {
"n_output_node": y_encoder.n_classes,
"input_shape": x_train.shape,
"train_data": train_data,
"test_data": test_data
}
cnnModule.fit(n_output_node=fit_args.get("n_output_node"),
input_shape=fit_args.get("input_shape"),
train_data=fit_args.get("train_data"),
test_data=fit_args.get("test_data"),
time_limit=24 * 60 * 60)