def test_tf_dataset(ray_start_4_cpus): # noqa: F811
num_points = 32 * 100 * 2
data = [i * (1 / num_points) for i in range(num_points)]
it = parallel_it.from_items(data, 2, False).for_each(lambda x: [x, x])
# this will create MLDataset with column RangeIndex(range(2))
ds = ml_data.from_parallel_iter(it, True, batch_size=32, repeated=False)
tf_ds = ds.to_tf(feature_columns=[0], label_column=1)
trainer = TFTrainer(
model_creator=model_creator,
data_creator=make_data_creator(tf_ds),
num_replicas=2,
config={
"batch_size": 32,
"fit_config": {
"steps_per_epoch": 100,
},
},
)
for _ in range(10):
trainer.train()
model = trainer.get_model()
prediction = model.predict([0.5])[0][0]
assert 0.4 <= prediction <= 0.6
trainer.shutdown()
def test_save_and_restore(ray_start_2_cpus, num_replicas): # noqa: F811
trainer1 = TFTrainer(model_creator=simple_model,
data_creator=simple_dataset,
num_replicas=num_replicas,
config=SIMPLE_CONFIG)
trainer1.train()
tmpdir = tempfile.mkdtemp()
filename = os.path.join(tmpdir, "checkpoint")
trainer1.save(filename)
model1 = trainer1.get_model()
trainer1.shutdown()
trainer2 = TFTrainer(model_creator=simple_model,
data_creator=simple_dataset,
num_replicas=num_replicas,
config=SIMPLE_CONFIG)
trainer2.restore(filename)
model2 = trainer2.get_model()
trainer2.shutdown()
shutil.rmtree(tmpdir)
model1.get_config()
model2.get_config()
# assert _compare(model1_config, model2_config, skip_keys=["name"])
model1_weights = model1.get_weights()
model2_weights = model2.get_weights()
assert _compare(model1_weights, model2_weights)
model1.optimizer.get_weights()
model2.optimizer.get_weights()
class TFEstimator(EstimatorInterface, SparkEstimatorInterface):
def __init__(self,
num_workers: int = 1,
model: keras.Model = None,
optimizer: Union[keras.optimizers.Optimizer, str] = None,
loss: Union[keras.losses.Loss, str] = None,
metrics: Union[List[keras.metrics.Metric], List[str]] = None,
feature_columns: Union[str, List[str]] = None,
feature_types: Optional[Union[DType, List[DType]]] = None,
feature_shapes: Optional[Union[TensorShape,
List[TensorShape]]] = None,
label_column: str = None,
label_type: Optional[tf.DType] = None,
label_shape: Optional[tf.TensorShape] = None,
batch_size: int = 128,
num_epochs: int = 1,
shuffle: bool = True,
**extra_config):
"""A scikit-learn like API to distributed training Tensorflow Keras model.
In the backend it leverage the ray.sgd.TorchTrainer.
:param num_workers: the number of workers for distributed model training
:param model: the model, it should be instance of tensorflow.keras.Model. We do not support
multiple output models.
:param optimizer: the optimizer, it should be keras.optimizers.Optimizer instance or str.
We do not support multiple optimizers currently.
:param loss: the loss, it should be keras.losses.Loss instance or str. We do not support
multiple losses.
:param metrics: the metrics list. It could be None, a list of keras.metrics.Metric instance
or a list of str.
:param feature_columns: the feature columns name.
The inputs of the model will be match the feature columns.
.. code-block:: python
feature_columns = ["x", "y", "z"]
# the input to the model will be (x_batch_tensor, y_batch_tensor, z_batch_tensor)
:param feature_types: the type for each feature input. It must match the length of the
feature_columns if provided. It will be tf.float32 by default.
:param feature_shapes: the shape for each feature input. It must match the length of the
feature_columns
:param label_column: the label column name.
:param label_type: the label type, it will be tf.float32 by default.
:param label_shape: the label shape.
:param batch_size: the batch size
:param num_epochs: the number of epochs
:param shuffle: whether input dataset should be shuffle, True by default.
:param extra_config: extra config will fit into TFTrainer. You can also set
the get_shard config with
{"get_shard": {batch_ms=0, num_async=5, shuffle_buffer_size=2, seed=0}}.
You can refer to the MLDataset.get_repeatable_shard for the parameters.
"""
self._num_workers: int = num_workers
# model
assert model is not None, "model must be not be None"
if isinstance(model, keras.Model):
self._serialized_model = model.to_json()
else:
raise Exception(
"Unsupported parameter, we only support tensorflow.keras.Model"
)
# optimizer
# TODO: we should support multiple optimizers for multiple outputs model
assert optimizer is not None, "optimizer must not be None"
if isinstance(optimizer, str):
# it is a str represents the optimizer
_optimizer = optimizer
elif isinstance(optimizer, keras.optimizers.Optimizer):
_optimizer = keras.optimizers.serialize(optimizer)
else:
raise Exception(
"Unsupported parameter, we only support keras.optimizers.Optimizer subclass "
"instance or a str to represent the optimizer")
self._serialized_optimizer = _optimizer
# loss
# TODO: we should support multiple losses for multiple outputs model
assert loss is not None, "loss must not be None"
if isinstance(loss, str):
_loss = loss
elif isinstance(loss, keras.losses.Loss):
_loss = keras.losses.serialize(loss)
else:
raise Exception(
"Unsupported parameter, we only support keras.losses.Loss subclass "
"instance or a str to represents the loss)")
self._serialized_loss = _loss
# metrics
if metrics is None:
_metrics = None
else:
assert isinstance(metrics, list), "metrics must be a list"
if isinstance(metrics[0], str):
_metrics = metrics
elif isinstance(metrics[0], keras.metrics.Metric):
_metrics = [keras.metrics.serialize(m) for m in metrics]
else:
raise Exception(
"Unsupported parameter, we only support list of "
"keras.metrics.Metrics instances or list of str to")
self._serialized_metrics = _metrics
self._feature_columns = feature_columns
self._feature_types = feature_types
self._feature_shapes = feature_shapes
self._label_column = label_column
self._label_type = label_type
self._label_shape = label_shape
self._batch_size = batch_size
self._extra_config = extra_config
config = {"batch_size": self._batch_size, "shuffle": shuffle}
if self._extra_config:
if "config" in self._extra_config:
self._extra_config["config"].update(config)
else:
self._extra_config["config"] = config
else:
self._extra_config = {"config": config}
self._num_epochs: int = num_epochs
self._trainer: TFTrainer = None
def _create_tf_ds(self, ds: MLDataset) -> TFMLDataset:
return ds.to_tf(self._feature_columns, self._feature_shapes,
self._feature_types, self._label_column,
self._label_shape, self._label_type)
def fit(self,
train_ds: MLDataset,
evaluate_ds: Optional[MLDataset] = None) -> NoReturn:
super(TFEstimator, self).fit(train_ds, evaluate_ds)
def model_creator(config):
# https://github.com/ray-project/ray/issues/5914
import tensorflow.keras as keras
model: keras.Model = keras.models.model_from_json(
self._serialized_model)
optimizer = keras.optimizers.get(self._serialized_optimizer)
loss = keras.losses.get(self._serialized_loss)
metrics = [keras.metrics.get(m) for m in self._serialized_metrics]
model.compile(optimizer=optimizer, loss=loss, metrics=metrics)
return model
train_ds = train_ds.batch(self._batch_size)
train_tf_ds = self._create_tf_ds(train_ds)
if evaluate_ds is not None:
evaluate_ds = evaluate_ds.batch(self._batch_size)
evaluate_tf_ds = self._create_tf_ds(evaluate_ds)
else:
evaluate_tf_ds = None
def data_creator(config):
if "TF_CONFIG" in os.environ:
tf_config = json.loads(os.environ["TF_CONFIG"])
world_rank = tf_config["task"]["index"]
else:
world_rank = -1
batch_size = config["batch_size"]
get_shard_config = config.get("get_shard", {})
if "shuffle" in config:
get_shard_config["shuffle"] = config["shuffle"]
train_data = train_tf_ds.get_shard(
world_rank, **get_shard_config).repeat().batch(batch_size)
evaluate_data = None
if evaluate_tf_ds is not None:
evaluate_data = evaluate_tf_ds.get_shard(
world_rank, **get_shard_config).batch(batch_size)
return train_data, evaluate_data
self._trainer = TFTrainer(model_creator=model_creator,
data_creator=data_creator,
num_replicas=self._num_workers,
**self._extra_config)
for i in range(self._num_epochs):
stats = self._trainer.train()
print(f"Epoch-{i}: {stats}")
if evaluate_tf_ds is not None:
print(self._trainer.validate())
def fit_on_spark(self,
train_df: DF,
evaluate_df: OPTIONAL_DF = None,
fs_directory: Optional[str] = None,
compression: Optional[str] = None) -> NoReturn:
super(TFEstimator, self).fit_on_spark(train_df, evaluate_df)
train_df = self._check_and_convert(train_df)
if evaluate_df is not None:
evaluate_df = self._check_and_convert(evaluate_df)
train_ds = create_ml_dataset_from_spark(train_df, self._num_workers,
self._batch_size, fs_directory,
compression)
evaluate_ds = None
if evaluate_df is not None:
evaluate_ds = create_ml_dataset_from_spark(evaluate_df,
self._num_workers,
self._batch_size,
fs_directory,
compression)
return self.fit(train_ds, evaluate_ds)
def get_model(self) -> Any:
assert self._trainer, "Trainer has not been created"
return self._trainer.get_model()
def save(self, file_path) -> NoReturn:
assert self._trainer, "Trainer has not been created"
self._trainer.save(file_path)
def restore(self, file_path) -> NoReturn:
assert self._trainer, "Trainer has not been created"
self._trainer.restore(file_path)
def shutdown(self) -> NoReturn:
if self._trainer is not None:
self._trainer.shutdown()
del self._trainer
class TFEstimator(EstimatorInterface, SparkEstimatorInterface):
def __init__(self,
num_workers: int = 1,
model: keras.Model = None,
optimizer: Union[keras.optimizers.Optimizer, str] = None,
loss: Union[keras.losses.Loss, str] = None,
metrics: Union[List[keras.metrics.Metric], List[str]] = None,
feature_columns: Union[str, List[str]] = None,
feature_types: Optional[Union[DType, List[DType]]] = None,
feature_shapes: Optional[Union[TensorShape,
List[TensorShape]]] = None,
label_column: str = None,
label_type: Optional[tf.DType] = None,
label_shape: Optional[tf.TensorShape] = None,
batch_size: int = 128,
num_epochs: int = 1,
shuffle: bool = True,
**extra_config):
"""
A scikit-learn like API to distributed training Tensorflow Keras model. In the backend it
leverage the ray.sgd.TorchTrainer.
:param num_workers: the number of workers for distributed model training
:param model: the model, it should be instance of tensorflow.keras.Model. We do not support
multiple output models.
:param optimizer: the optimizer, it should be keras.optimizers.Optimizer instance or str.
We do not support multiple optimizers currently.
:param loss: the loss, it should be keras.losses.Loss instance or str. We do not support
multiple losses.
:param metrics: the metrics list. It could be None, a list of keras.metrics.Metric instance
or a list of str.
:param feature_columns: the feature columns name.
:param feature_types: the type for each feature input. It must match the length of the
feature_columns if provided. It will be tf.float32 by default.
:param feature_shapes: the shape for each feature input. It must match the length of the
feature_columns
:param label_column: the label column name.
:param label_type: the label type, it will be tf.float32 by default.
:param label_shape: the label shape.
:param batch_size: the batch size
:param num_epochs: the number of epochs
:param shuffle: whether input dataset should be shuffle, True by default.
:param extra_config: extra config will fit into TFTrainer.
"""
self._num_workers: int = num_workers
# model
assert model is not None, "model must be not be None"
if isinstance(model, keras.Model):
self._serialized_model = model.to_json()
else:
raise Exception(
"Unsupported parameter, we only support tensorflow.keras.Model"
)
# optimizer
# TODO: we should support multiple optimizers for multiple outputs model
assert optimizer is not None, "optimizer must not be None"
if isinstance(optimizer, str):
# it is a str represents the optimizer
_optimizer = optimizer
elif isinstance(optimizer, keras.optimizers.Optimizer):
_optimizer = keras.optimizers.serialize(optimizer)
else:
raise Exception(
"Unsupported parameter, we only support keras.optimizers.Optimizer subclass "
"instance or a str to represent the optimizer")
self._serialized_optimizer = _optimizer
# loss
# TODO: we should support multiple losses for multiple outputs model
assert loss is not None, "loss must not be None"
if isinstance(loss, str):
_loss = loss
elif isinstance(loss, keras.losses.Loss):
_loss = keras.losses.serialize(loss)
else:
raise Exception(
"Unsupported parameter, we only support keras.losses.Loss subclass "
"instance or a str to represents the loss)")
self._serialized_loss = _loss
# metrics
if metrics is None:
_metrics = None
else:
assert isinstance(metrics, list), "metrics must be a list"
if isinstance(metrics[0], str):
_metrics = metrics
elif isinstance(metrics[0], keras.metrics.Metric):
_metrics = [keras.metrics.serialize(m) for m in metrics]
else:
raise Exception(
"Unsupported parameter, we only support list of "
"keras.metrics.Metrics instances or list of str to")
self._serialized_metrics = _metrics
self._feature_columns = feature_columns
self._feature_types = feature_types
self._feature_shapes = feature_shapes
self._label_column = label_column
self._label_type = label_type
self._label_shape = label_shape
self._batch_size = batch_size
_config = {"batch_size": batch_size}
if extra_config is not None:
_config.update(extra_config)
self._config = _config
self._num_epochs: int = num_epochs
self._shuffle: bool = shuffle
self._trainer: TFTrainer = None
def fit(self, ds: ParallelPandasDataset, **kwargs) -> NoReturn:
if "fit_config" not in self._config:
self._config["fit_config"] = {}
if "steps_per_epoch" not in self._config["fit_config"]:
def count_fn(it) -> int:
count = 0
for pdf in it:
count += pdf.shape[0]
return count
minimum_records = min(ds.apply(count_fn))
self._config["fit_config"][
"steps_per_epoch"] = minimum_records // self._batch_size
def model_creator(config):
# https://github.com/ray-project/ray/issues/5914
import tensorflow.keras as keras
model: keras.Model = keras.models.model_from_json(
self._serialized_model)
optimizer = keras.optimizers.get(self._serialized_optimizer)
loss = keras.losses.get(self._serialized_loss)
metrics = [keras.metrics.get(m) for m in self._serialized_metrics]
model.compile(optimizer=optimizer, loss=loss, metrics=metrics)
return model
data_set = TFDataset(ds, self._feature_columns, self._feature_types,
self._feature_shapes, self._label_column,
self._label_type, self._label_shape,
self._shuffle)
def data_creator(config):
return data_set.setup(config), None
self._trainer = TFTrainer(model_creator, data_creator, self._config,
self._num_workers)
for i in range(self._num_epochs):
stats = self._trainer.train()
print(f"Epoch-{i}: {stats}")
def fit_on_spark(self, df, **kwargs) -> NoReturn:
super(TFEstimator, self).fit_on_spark(df, **kwargs)
ds = save_to_ray(df, self._num_workers)
self.fit(ds)
def evaluate(self, df: ParallelPandasDataset, **kwargs) -> NoReturn:
if self._trainer is None:
raise Exception("Must call fit first")
dataset = TFDataset(df, self._feature_columns, self._feature_types,
self._feature_shapes, self._label_column,
self._label_type, self._label_shape, self._shuffle)
config = self._config
tf_dataset: tf.data.Dataset = dataset.setup(config)
model: keras.Model = self._trainer.get_model()
result = model.evaluate(tf_dataset)
print(result)
def evaluate_on_spark(self, df, **kwargs) -> NoReturn:
super(TFEstimator, self).evaluate_on_spark(df)
if self._trainer is None:
raise Exception("Must call fit first")
pdf = df.toPandas()
dataset = PandasTFDataset(pdf, self._feature_columns,
self._feature_types, self._feature_shapes,
self._label_column, self._label_type,
self._label_shape, self._shuffle)
config = self._config
tf_dataset: tf.data.Dataset = dataset.setup(config)
model: keras.Model = self._trainer.get_model()
result = model.evaluate(tf_dataset)
print(result)
def get_model(self) -> Any:
assert self._trainer, "Trainer has not been created"
return self._trainer.get_model()
def save(self, file_path) -> NoReturn:
assert self._trainer, "Trainer has not been created"
self._trainer.save(file_path)
def restore(self, file_path) -> NoReturn:
assert self._trainer, "Trainer has not been created"
self._trainer.restore(file_path)
def shutdown(self) -> NoReturn:
if self._trainer is not None:
self._trainer.shutdown()
del self._trainer