def test_build_objective():
cfg_model = {
"outputs": [
{
"name":
"out1",
"loss": {
"import": "categorical_crossentropy"
},
"loss_weight":
0.7,
"metrics": [
{
"import": "accuracy"
},
{
"import": "tensorflow.keras.metrics.Precision",
"params": {
"name": "p"
},
},
{
"import": "tf.keras.losses.CategoricalCrossentropy"
},
],
"sample_weight_mode":
"temporal",
},
{
"name": "out2",
"loss": {
"import": "tensorflow.keras.losses.CategoricalCrossentropy"
},
"loss_weight": 0.3,
},
]
}
objective = model.build_objective(cfg_model)
assert objective["loss"]["out1"] == "categorical_crossentropy"
assert isinstance(objective["loss"]["out2"],
tf.keras.losses.CategoricalCrossentropy)
assert objective["metrics"]["out1"][0] == "accuracy"
assert isinstance(objective["metrics"]["out1"][1],
tf.keras.metrics.Precision)
assert objective["metrics"]["out1"][1].name == "p"
assert isinstance(objective["metrics"]["out1"][2],
tf.keras.losses.CategoricalCrossentropy)
assert objective["metrics"]["out2"] == []
assert objective["loss_weights"] == {"out1": 0.7, "out2": 0.3}
assert objective["sample_weight_mode"] == {
"out1": "temporal",
"out2": None
}
def train(
self,
cfg: dict,
records_train: api.InputRecords,
records_validation: api.InputRecords,
) -> tf.keras.Model:
"""Train the network.
Args:
cfg: dict, config.
records_train: InputRecords, training records.
records_validation: InputRecords, validation records.
Returns:
tf.keras.Model, trained network.
"""
logger.info("Starting training")
tf_utils.reset()
cfg = config.prepare_config(cfg)
logger.info(f"Creating artifact directory: {self.artifact_dir}")
services.make_artifact_dir(self.artifact_dir)
io_utils.save_json(cfg, "config.json", self.artifact_dir)
io_utils.save_pickle(cfg, "config.pkl", self.artifact_dir)
logger.info("Creating datasets")
ds_train = dataset.RecordDataset(
artifact_dir=self.artifact_dir,
cfg_dataset=cfg["dataset"],
records=records_train,
mode=api.RecordMode.TRAIN,
batch_size=cfg["solver"]["batch_size"],
)
ds_validation = dataset.RecordDataset(
artifact_dir=self.artifact_dir,
cfg_dataset=cfg["dataset"],
records=records_validation,
mode=api.RecordMode.VALIDATION,
batch_size=cfg["solver"]["batch_size"],
)
network_params = ds_train.transformer.network_params
io_utils.save_json(network_params, "network_params.json", self.artifact_dir)
io_utils.save_pickle(network_params, "network_params.pkl", self.artifact_dir)
logger.info("Building network")
net = model.build_network(cfg["model"], network_params)
model.check_output_names(cfg["model"], net)
logger.info("Compiling network")
opt = solver.build_optimizer(cfg["solver"])
objective = model.build_objective(cfg["model"])
net.compile(optimizer=opt, **objective)
logger.info("Creating services")
callbacks = services.create_all_services(self.artifact_dir, cfg["services"])
if "learning_rate_reducer" in cfg["solver"]:
logger.info("Creating learning rate reducer")
callbacks.append(solver.create_learning_rate_reducer(cfg["solver"]))
logger.info("Training network")
net.summary()
net.fit(
ds_train,
validation_data=ds_validation,
epochs=cfg["solver"]["epochs"],
steps_per_epoch=cfg["solver"].get("steps"),
callbacks=callbacks,
verbose=1,
)
return net
def train(
self,
cfg: dict,
records_train: Union[pd.DataFrame, api.Records],
records_validation: Union[pd.DataFrame, api.Records],
workers: int = 10,
max_queue_size: int = 10,
) -> tf.keras.Model:
"""Train the network.
Args:
cfg: dict, config.
records_train: Union[pd.DataFrame, Records], training records.
records_validation: Union[pd.DataFrame, Records], validation records.
workers: int (OPTIONAL = 10), number of process threads for the sequence.
max_queue_size: int (OPTIONAL = 10), queue size for the sequence.
Returns:
tf.keras.Model, trained network.
"""
logger.info("Starting training")
tf_utils.reset()
logger.info("Validating config schema and applying defaults")
cfg = config.prepare_config(cfg)
logger.info(f"Making artifact directory: {self._artifact_dir}")
services.make_artifact_dir(self._artifact_dir)
logger.info("Saving config")
io_utils.save_json(cfg, "config.json", self._artifact_dir)
io_utils.save_pickle(cfg, "config.pkl", self._artifact_dir)
logger.info("Building datasets")
ds_train = dataset.RecordDataset(
artifact_dir=self._artifact_dir,
cfg_dataset=cfg["dataset"],
records=records_train,
mode=api.RecordMode.TRAIN,
batch_size=cfg["solver"]["batch_size"],
)
ds_validation = dataset.RecordDataset(
artifact_dir=self._artifact_dir,
cfg_dataset=cfg["dataset"],
records=records_validation,
mode=api.RecordMode.VALIDATION,
batch_size=cfg["solver"]["batch_size"],
)
network_params = ds_train.transformer.network_params
io_utils.save_json(network_params, "network_params.json", self._artifact_dir)
io_utils.save_pickle(network_params, "network_params.pkl", self._artifact_dir)
logger.info("Building network")
net = model.build_network(cfg["model"], network_params)
logger.info("Checking network output names match config output names")
model.check_output_names(cfg["model"], net)
logger.info("Building optimizer")
opt = solver.build_optimizer(cfg["solver"])
logger.info("Building objective")
objective = model.build_objective(cfg["model"])
logger.info("Compiling network")
net.compile(optimizer=opt, **objective)
metrics_names = net.metrics_names
logger.info("Creating services")
callbacks = services.create_all_services(
self._artifact_dir, cfg["services"], metrics_names
)
if "learning_rate_reducer" in cfg["solver"]:
logger.info("Creating learning rate reducer")
callbacks.append(
solver.create_learning_rate_reducer(cfg["solver"], metrics_names)
)
logger.info("Training network")
logger.info(net.summary())
net.fit_generator(
ds_train,
validation_data=ds_validation,
epochs=cfg["solver"]["epochs"],
steps_per_epoch=cfg["solver"].get("steps"),
callbacks=callbacks,
use_multiprocessing=(workers > 1),
max_queue_size=max_queue_size,
workers=workers,
verbose=1,
)
return net