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test_tf.py
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test_tf.py
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import numpy as np
import pandas as pd
import pytest
import tensorflow as tf
import ray
from ray import train
from ray.data.preprocessors import Concatenator
from ray.train import ScalingConfig
from ray.train.tensorflow import TensorflowTrainer
class TestToTF:
def test_autosharding_is_disabled(self):
ds = ray.data.from_items([{"spam": 0, "ham": 0}])
dataset = ds.to_tf(feature_columns="spam", label_columns="ham")
actual_auto_shard_policy = (
dataset.options().experimental_distribute.auto_shard_policy
)
expected_auto_shard_policy = tf.data.experimental.AutoShardPolicy.OFF
assert actual_auto_shard_policy is expected_auto_shard_policy
def test_element_spec_type(self):
ds = ray.data.from_items([{"spam": 0, "ham": 0}])
dataset = ds.to_tf(feature_columns="spam", label_columns="ham")
feature_spec, label_spec = dataset.element_spec
assert isinstance(feature_spec, tf.TypeSpec)
assert isinstance(label_spec, tf.TypeSpec)
def test_element_spec_user_provided(self):
ds = ray.data.from_items([{"spam": 0, "ham": 0, "eggs": 0}])
dataset1 = ds.to_tf(feature_columns=["spam", "ham"], label_columns="eggs")
feature_spec, label_spec = dataset1.element_spec
dataset2 = ds.to_tf(
feature_columns=["spam", "ham"],
label_columns="eggs",
feature_type_spec=feature_spec,
label_type_spec=label_spec,
)
feature_output_spec, label_output_spec = dataset2.element_spec
assert isinstance(label_output_spec, tf.TypeSpec)
assert isinstance(feature_output_spec, dict)
assert feature_output_spec.keys() == {"spam", "ham"}
assert all(
isinstance(value, tf.TypeSpec) for value in feature_output_spec.values()
)
def test_element_spec_type_with_multiple_columns(self):
ds = ray.data.from_items([{"spam": 0, "ham": 0, "eggs": 0}])
dataset = ds.to_tf(feature_columns=["spam", "ham"], label_columns="eggs")
feature_output_signature, _ = dataset.element_spec
assert isinstance(feature_output_signature, dict)
assert feature_output_signature.keys() == {"spam", "ham"}
assert all(
isinstance(value, tf.TypeSpec)
for value in feature_output_signature.values()
)
df = pd.DataFrame(
{"feature1": [0, 1, 2], "feature2": [3, 4, 5], "label": [0, 1, 1]}
)
ds = ray.data.from_pandas(df)
dataset = ds.to_tf(
feature_columns=["feature1", "feature2"],
label_columns="label",
batch_size=3,
)
feature_output_signature, _ = dataset.element_spec
assert isinstance(feature_output_signature, dict)
assert feature_output_signature.keys() == {"feature1", "feature2"}
assert all(
isinstance(value, tf.TypeSpec)
for value in feature_output_signature.values()
)
features, labels = next(iter(dataset))
assert (labels.numpy() == df["label"].values).all()
assert (features["feature1"].numpy() == df["feature1"].values).all()
assert (features["feature2"].numpy() == df["feature2"].values).all()
def test_element_spec_name(self):
ds = ray.data.from_items([{"spam": 0, "ham": 0}])
dataset = ds.to_tf(feature_columns="spam", label_columns="ham")
feature_spec, label_spec = dataset.element_spec
assert feature_spec.name == "spam"
assert label_spec.name == "ham"
@pytest.mark.parametrize(
"data, expected_dtype",
[
(0, tf.int64),
(0.0, tf.double),
(False, tf.bool),
("eggs", tf.string),
(np.zeros([2, 2], dtype=np.float32), tf.float32),
],
)
def test_element_spec_dtype(self, data, expected_dtype):
ds = ray.data.from_items([{"spam": data, "ham": data}])
dataset = ds.to_tf(feature_columns="spam", label_columns="ham")
feature_spec, label_spec = dataset.element_spec
assert feature_spec.dtype == expected_dtype
assert label_spec.dtype == expected_dtype
def test_element_spec_shape(self):
ds = ray.data.from_items(8 * [{"spam": 0, "ham": 0}])
dataset = ds.to_tf(feature_columns="spam", label_columns="ham", batch_size=4)
feature_spec, label_spec = dataset.element_spec
assert tuple(feature_spec.shape) == (None,)
assert tuple(label_spec.shape) == (None,)
features, labels = next(iter(dataset))
assert tuple(features.shape) == (4,)
assert tuple(labels.shape) == (4,)
def test_element_spec_shape_with_tensors(self):
ds = ray.data.from_items(8 * [{"spam": np.zeros([3, 32, 32]), "ham": 0}])
dataset = ds.to_tf(feature_columns="spam", label_columns="ham", batch_size=4)
feature_spec, _ = dataset.element_spec
assert tuple(feature_spec.shape) == (None, 3, 32, 32)
features, labels = next(iter(dataset))
assert tuple(features.shape) == (4, 3, 32, 32)
assert tuple(labels.shape) == (4,)
@pytest.mark.parametrize("batch_size", [1, 2])
def test_element_spec_shape_with_ragged_tensors(self, batch_size):
df = pd.DataFrame(
{
"spam": [np.zeros([32, 32, 3]), np.zeros([64, 64, 3])],
"ham": [0, 0],
}
)
ds = ray.data.from_pandas(df)
dataset = ds.to_tf(
feature_columns="spam", label_columns="ham", batch_size=batch_size
)
feature_spec, _ = dataset.element_spec
assert tuple(feature_spec.shape) == (None, None, None, None)
features, labels = next(iter(dataset))
assert tuple(features.shape) == (batch_size, None, None, None)
assert tuple(labels.shape) == (batch_size,)
def test_training(self):
def build_model() -> tf.keras.Model:
return tf.keras.Sequential([tf.keras.layers.Dense(1)])
def train_func():
strategy = tf.distribute.MultiWorkerMirroredStrategy()
with strategy.scope():
multi_worker_model = build_model()
multi_worker_model.compile(
optimizer=tf.keras.optimizers.SGD(),
loss=tf.keras.losses.mean_absolute_error,
metrics=[tf.keras.metrics.mean_squared_error],
)
dataset = train.get_dataset_shard("train").to_tf("X", "Y", batch_size=4)
multi_worker_model.fit(dataset)
dataset = ray.data.from_items(8 * [{"X0": 0, "X1": 0, "Y": 0}])
concatenator = Concatenator(exclude=["Y"], output_column_name="X")
dataset = concatenator.transform(dataset)
trainer = TensorflowTrainer(
train_loop_per_worker=train_func,
scaling_config=ScalingConfig(num_workers=2),
datasets={"train": dataset},
)
trainer.fit()
def test_invalid_column_raises_error(self):
ds = ray.data.from_items([{"spam": 0, "ham": 0}])
with pytest.raises(ValueError):
ds.to_tf(feature_columns="foo", label_columns="bar")
if __name__ == "__main__":
import sys
sys.exit(pytest.main(["-v", __file__]))