def __next__(self):
length = len(self)
if length == 0:
raise StopIteration()
if self._curent_position == length:
if self._loop:
self.reset()
else:
raise StopIteration()
entry = self._datasets[self._curent_position]
env = getattr(self, 'rasterio_env', {})
self._curent_position += 1
entry_name, entry_components = entry
new_components = {}
cache_data = self._cache_data
use_tensorflow_io = False
for component_name, component_path in entry_components.items():
if isinstance(component_path, DatasetReader):
component_path = component_path.name
local_component_path = component_path
url_components = urlparse(component_path)
if not url_components.scheme:
cache_data = False
if url_components.path.startswith('/vsigs/'):
cache_data = True # We should check if we run inside GCP ML Engine
use_tensorflow_io = True
component_path = url_components.path[6:]
component_path = "gs:/" + component_path
else:
if url_components.scheme == 'file':
local_component_path = url_components.path
use_tensorflow_io = False
cache_data = False
with rasterio.Env(**env):
if use_tensorflow_io:
real_path = component_path
data = IOUtils.open_file(real_path, "rb").read()
if cache_data:
hash = sha224(component_path.encode("utf8")).hexdigest()
hash_part = "/".join(list(hash)[:3])
dataset_path = os.path.join(self._temp_dir, hash_part)
if not IOUtils.file_exists(dataset_path):
IOUtils.recursive_create_dir(dataset_path)
dataset_path = os.path.join(dataset_path, os.path.basename(component_path))
if not IOUtils.file_exists(dataset_path):
f = IOUtils.open_file(dataset_path, "wb")
f.write(data)
f.close()
component_src = rasterio.open(dataset_path)
else:
with NamedTemporaryFile() as tmpfile:
tmpfile.write(data)
tmpfile.flush()
component_src = rasterio.open(tmpfile.name)
else:
component_src = rasterio.open(local_component_path)
new_components[component_name] = component_src
return (entry_name, new_components)
def __next__(self):
length = len(self)
if length == 0:
raise StopIteration()
if self._curent_position == length:
if self._loop:
if self.randomise_on_loop:
random.shuffle(self._datasets)
self.reset()
else:
raise StopIteration()
entry = self._datasets[self._curent_position]
env = getattr(self, 'rasterio_env', {})
self._curent_position += 1
entry_name, entry_components = entry
new_components = {}
cache_data = self._cache_data
use_tensorflow_io = False
for component_name, component_path_entry in entry_components.items():
if isinstance(component_path_entry, (RasterGenerator, GeoDataFrame, MemoryFile)):
new_components[component_name] = component_path_entry
continue
elif isinstance(component_path_entry, GeoDataFrame):
new_components[component_name] = component_path_entry
continue
elif isinstance(component_path_entry, DatasetReader):
component_path = component_path_entry.name
elif isinstance(component_path_entry, str):
component_path = component_path_entry
else:
raise NotImplementedError("Unsupported type for component value")
local_component_path = component_path
url_components = urlparse(component_path)
if not url_components.scheme:
cache_data = False
if url_components.path.startswith('/vsigs/'):
cache_data = True # We should check if we run inside GCP ML Engine
use_tensorflow_io = True
component_path = url_components.path[6:]
component_path = "gs:/" + component_path
else:
if url_components.scheme == 'file':
local_component_path = url_components.path
use_tensorflow_io = False
cache_data = False
with rasterio.Env(**env):
if use_tensorflow_io:
real_path = component_path
data = IOUtils.open_file(real_path, "rb").read()
if cache_data:
hash = sha224(component_path.encode("utf8")).hexdigest()
hash_part = "/".join(list(hash)[:3])
dataset_path = os.path.join(self._temp_dir, hash_part)
if not IOUtils.file_exists(dataset_path):
IOUtils.recursive_create_dir(dataset_path)
dataset_path = os.path.join(dataset_path, os.path.basename(component_path))
if not IOUtils.file_exists(dataset_path):
f = IOUtils.open_file(dataset_path, "wb")
f.write(data)
f.close()
component_src = self.get_component_file_descriptor(dataset_path)
else:
with NamedTemporaryFile() as tmpfile:
tmpfile.write(data)
tmpfile.flush()
component_src = self.get_component_file_descriptor(tmpfile.name)
else:
component_src = self.get_component_file_descriptor(local_component_path)
new_components[component_name] = component_src
# Trigger the generation of the dynamic components
for component_name, component_path in new_components.items():
if isinstance(component_path, RasterGenerator):
new_components[component_name] = component_path(new_components)
return entry_name, new_components
def train_keras(model_name,
window_size,
stride_size,
model_config,
mapping,
train_datasets,
validation_datasets,
pre_callbacks=(),
enable_multi_gpu=False,
gpus=None,
cpu_merge=True,
cpu_relocation=False,
batch_size=None,
random_seed=None,
):
log.info("Starting keras training")
import tensorflow as tf
# Seed initialization should happed as early as possible
if random_seed is not None:
log.info("Setting Tensorflow random seed to: %d", random_seed)
tf.set_random_seed(random_seed)
from keras.callbacks import EarlyStopping, TensorBoard, ReduceLROnPlateau
from ..tools.callbacks import ModelCheckpoint, CSVLogger
from keras.optimizers import Adam
from ..tools.utils import import_model_builder
from keras.models import load_model
from keras.utils import multi_gpu_model
if batch_size is None:
batch_size = model_config.get("batch_size", None)
model_path = model_config["model_path"]
model_loss = model_config.get("loss", "categorical_crossentropy")
log.info("Using loss: %s", model_loss)
model_metrics = model_config.get("metrics", "accuracy")
# Make code compatible with previous version
format_converter = model_config.get("format_converter", CategoricalConverter(2))
swap_axes = model_config["swap_axes"]
train_epochs = model_config["train_epochs"]
prefetch_queue_size = model_config.get("prefetch_queue_size", 10)
input_channels = len(mapping["inputs"])
include_last_classfication =model_config.get("include_classfication_layer",True)
z_scaler = model_config.get('z_scaler',None)
train_data = DataGenerator(train_datasets,
batch_size,
mapping["inputs"],
mapping["target"],
format_converter=format_converter,
swap_axes=swap_axes,
postprocessing_callbacks=pre_callbacks,
default_window_size=window_size,
default_stride_size=stride_size,z_scaler=z_scaler)
train_data = ThreadedDataGenerator(train_data, queue_size=prefetch_queue_size)
validation_data = DataGenerator(validation_datasets,
batch_size,
mapping["inputs"],
mapping["target"],
format_converter=format_converter,
swap_axes=swap_axes,
default_window_size=window_size,
default_stride_size=stride_size,z_scaler=z_scaler)
validation_data = ThreadedDataGenerator(validation_data, queue_size=prefetch_queue_size)
model_builder, model_builder_custom_options = import_model_builder(model_config["model_builder"])
model_builder_option = model_config.get("options", {})
steps_per_epoch = getattr(model_config, "steps_per_epoch", len(train_data) // batch_size)
validation_steps_per_epoch = getattr(model_config, "validation_steps_per_epoch", len(validation_data) // batch_size)
log.info("Traing data has %d tiles", len(train_data))
log.info("Validation data has %d tiles", len(validation_data))
log.info("validation_steps_per_epoch: %d", validation_steps_per_epoch)
log.info("steps_per_epoch: %d", steps_per_epoch)
load_only_weights = model_config.get("load_only_weights", False)
checkpoint = model_config.get("checkpoint", None)
callbacks = []
early_stopping = model_config.get("early_stopping", None)
adaptive_lr = model_config.get("adaptive_lr", None)
tensor_board = model_config.get("tensor_board", False)
tb_log_dir = model_config.get("tb_log_dir", os.path.join("/tmp/", model_name)) # TensorBoard log directory
tb_log_dir = tb_log_dir.format(model_name=model_name,
time=str(time.time()),
hostname=socket.gethostname(),
user=getpass.getuser())
keras_logging = model_config.get("log", None)
if not keras_logging:
log.info("Keras logging is disabled")
else:
csv_log_file = keras_logging.format(model_name=model_name,
time=str(time.time()),
hostname=socket.gethostname(),
user=getpass.getuser())
dir_head, dir_tail = os.path.split(csv_log_file)
if dir_tail and not IOUtils.file_exists(dir_head):
log.info("Creating directory: %s", dir_head)
IOUtils.recursive_create_dir(dir_head)
log.info("Logging training data to csv file: %s", csv_log_file)
csv_logger = CSVLogger(csv_log_file, separator=',', append=False)
callbacks.append(csv_logger)
if tensor_board:
log.info("Registering TensorBoard callback")
log.info("Event log dir set to: {}".format(tb_log_dir))
tb_callback = TensorBoard(log_dir=tb_log_dir, histogram_freq=0, write_graph=True, write_images=True)
callbacks.append(tb_callback)
log.info("To access TensorBoard run: tensorboard --logdir {} --port <port_number> --host <host_ip> ".format(
tb_log_dir))
if checkpoint:
checkpoint_file = checkpoint["path"]
log.info("Registering checkpoint callback")
destination_file = checkpoint_file % {
'model_name': model_name,
'time': str(time.time()),
'hostname': socket.gethostname(),
'user': getpass.getuser()}
dir_head, dir_tail = os.path.split(destination_file)
if dir_tail and not IOUtils.file_exists(dir_head):
log.info("Creating directory: %s", dir_head)
IOUtils.recursive_create_dir(dir_head)
log.info("Checkpoint data directed to: %s", destination_file)
checkpoint_options = checkpoint.get("options", {})
checkpoint_callback = ModelCheckpoint(destination_file, **checkpoint_options)
callbacks.append(checkpoint_callback)
log.info("Starting training")
options = {
'epochs': train_epochs,
'callbacks': callbacks
}
if len(validation_data) > 0 and validation_steps_per_epoch:
log.info("We have validation data")
options['validation_data'] = validation_data
options["validation_steps"] = validation_steps_per_epoch
if early_stopping:
log.info("Enabling early stopping %s", str(early_stopping))
callback_early_stopping = EarlyStopping(**early_stopping)
options["callbacks"].append(callback_early_stopping)
if adaptive_lr:
log.info("Enabling reduce lr on plateu: %s", str(adaptive_lr))
callback_lr_loss = ReduceLROnPlateau(**adaptive_lr)
options["callbacks"].append(callback_lr_loss)
else:
log.warn("No validation data available. Ignoring")
final_model_location = model_path.format(model_name=model_name,
time=str(time.time()),
hostname=socket.gethostname(),
user=getpass.getuser())
log.info("Model path is %s", final_model_location)
existing_model_location = None
if IOUtils.file_exists(final_model_location):
existing_model_location = final_model_location
if existing_model_location is not None and not load_only_weights:
log.info("Loading existing model from: %s", existing_model_location)
custom_objects = {}
if model_builder_custom_options is not None:
custom_objects.update(model_builder_custom_options)
if enable_multi_gpu:
with tf.device('/cpu:0'):
model = load_model(existing_model_location, custom_objects=custom_objects)
else:
model = load_model(existing_model_location, custom_objects=custom_objects)
nr_classes = model_builder_option.get('nr_classes', None)
if (not include_last_classfication) and nr_classes:
model.layers.pop()
l = Conv2D(25, (1, 1), activation='softmax',name="conv_final")(model.layers[-1].output)
layers = [ll for ll in model.layers]
layers.append(l)
m = Model (input=layers[0].input, output=layers[-1])
model = m
log.info("Model loaded!")
else:
log.info("Building model")
model_options = model_builder_option
model_options['n_channels'] = input_channels
input_height, input_width = window_size
model_options['input_width'] = model_builder_option.get('input_width', input_width)
model_options['input_height'] = model_builder_option.get('input_height', input_height)
activation = model_config.get('activation', None)
if activation:
model_options["activation"] = activation
if enable_multi_gpu:
with tf.device('/cpu:0'):
model = model_builder(**model_options)
else:
model = model_builder(**model_options)
log.info("Model built")
if load_only_weights and existing_model_location is not None:
log.info("Loading weights from %s", existing_model_location)
model.load_weights(existing_model_location)
log.info("Finished loading weights")
optimiser = model_config.get("optimiser", None)
if optimiser is None:
log.info("No optimiser specified. Using default Adam")
optimiser = Adam(lr=0.0001, beta_1=0.9, beta_2=0.999, epsilon=1e-8)
if enable_multi_gpu:
log.info("Using Keras Multi-GPU Training")
fit_model = multi_gpu_model(model, gpus=gpus, cpu_merge=cpu_merge, cpu_relocation=cpu_relocation)
else:
log.info("Using Keras default GPU Training")
fit_model = model
log.info("Compiling model")
fit_model.compile(loss=model_loss, optimizer=optimiser, metrics=model_metrics)
log.info("Model compiled")
model.summary()
fit_model.fit_generator(train_data, steps_per_epoch, **options)
log.info("Saving model to %s", os.path.abspath(final_model_location))
dir_head, dir_tail = os.path.split(final_model_location)
if dir_tail and not IOUtils.file_exists(dir_head):
log.info("Creating directory: %s", dir_head)
IOUtils.recursive_create_dir(dir_head)
model.save(final_model_location)
log.info("Done saving")
log.info("Training completed")