# Lint as: python3
import os
import tensorflow.compat.v2 as tf
import tensorflow.google.compat.v2 as tfg
import data_provider
from tfx.components.trainer import executor as trainer_executor
def get_hparams() -> tfg.HParams:
"""Defines the set of hyper parameters recognized by this model.
NOTE these hyperparameters are just for exemplifying purposes,
and should be tuned.
Returns:
An tf.HParams instance.
"""
return tfg.HParams(
train_batch_size=128,
eval_batch_size=128,
)
# TFX Trainer will call this function.
def run_fn(fn_args: trainer_executor.TrainerFnArgs):
"""Train a Keras Model based on given args.
Args:
fn_args: Holds args used to train the model as name/value pairs.
- train_files: A list of uris for train files.
- transform_output: An optional single uri for transform graph produced by
TFT. Will be None if not specified.
- serving_model_dir: A single uri for the output directory of the serving
model.
- eval_model_dir: A single uri for the output directory of the eval model.
Note that this is for estimator only, Keras doesn't require it for TFMA.
- eval_files: A list of uris for eval files.
- schema_file: A single uri for schema file.
- train_steps: Number of train steps.
- eval_steps: Number of eval steps.
- base_model: Base model that will be used for this training job.
- hyperparameters: An optional kerastuner.HyperParameters config.
"""
model_hparams = get_hparams()
data_provider = data_provider.DataProvider(
transform_graph_dir=fn_args.transform_output)
feature_columns = data_provider.get_numeric_feature_columns(
) + data_provider.get_embedding_feature_columns()
input_layers = data_provider.get_input_layers()
# All input_layers must be consumed for the Keras Model to work.
assert len(feature_columns) >= len(input_layers)
x = tf.keras.layers.DenseFeatures(feature_columns)(input_layers)
for numnodes in [64, 64]:
x = tf.keras.layers.Dense(numnodes)(x)
output = tf.keras.layers.Dense(
data_provider.forecast_horizon, activation=None, name='logits')(
x)
model = tf.keras.Model(input_layers, output)
model.compile(
loss=tf.keras.losses.MeanSquaredError(),
optimizer=tf.keras.optimizers.Adam(lr=0.001),
metrics=[
tf.keras.metrics.RootMeanSquaredError(),
tf.keras.metrics.MeanSquaredError(),
tf.keras.metrics.MeanAbsoluteError(),
tf.keras.metrics.MeanSquaredLogarithmicError(),
])
model.summary()
# This log path might change in the future.
log_dir = os.path.join(os.path.dirname(fn_args.serving_model_dir), 'logs')
tensorboard_callback = tf.keras.callbacks.TensorBoard(
log_dir=log_dir, update_freq='batch')
train_dataset = data_provider.get_dataset(
file_pattern=fn_args.train_files,
batch_size=model_hparams.train_batch_size,
num_epochs=None,
shuffle=True)
eval_dataset = data_provider.get_dataset(
file_pattern=fn_args.eval_files,
batch_size=model_hparams.eval_batch_size,
num_epochs=1,
shuffle=False)
model.fit(
train_dataset,
steps_per_epoch=fn_args.train_steps,
epochs=1,
validation_data=eval_dataset,
validation_steps=fn_args.eval_steps,
callbacks=[tensorboard_callback])
signatures = {
'serving_default':
data_provider.get_serve_tf_examples_fn(model).get_concrete_function(
tf.TensorSpec(shape=[None], dtype=tf.string, name='examples')),
}
model.save(fn_args.serving_model_dir, save_format='tf', signatures=signatures)# Lint as: python3
"""An data provider for Keras Models.
The consumed artifacts include:
* Dataset schema.
* Dataset statistics.
* TensorFlow Transform outputs.
"""
from typing import Any, Dict, List, Optional, Text
import tensorflow.compat.v2 as tf
import tensorflow_transform as tft
from google3.third_party.tensorflow_metadata.proto.v0 import schema_pb2
FeatureColumn = Any
class DataProvider():
"""Creates feature columns and specs from TFX artifacts."""
def __init__(self, transform_graph_dir: Text):
"""Initializes the DataProvider from TFX artifacts.
Args:
transform_graph_dir: Path to the TensorFlow Transform graph artifacts.
"""
# Parse transform.
self._tf_transform_output = tft.TFTransformOutput(transform_graph_dir)
# Parse schema.
self._dataset_schema = self._tf_transform_output.transformed_metadata.schema
@property
def raw_label_keys(self) -> List[Text]:
"""The raw label key as defined in the ProblemStatement."""
# TODO(weill): Make this label configurable.
return ['future_sales']
@property
def transformed_label_keys(self) -> List[Text]:
"""The label key after applying TensorFlow Transform to the Examples."""
return self.raw_label_keys
@property
def forecast_horizon(self) -> int:
"""The int forecast horizon for future sales."""
# 28 days.
return 28
def get_input_layers(self) -> Dict[Text, tf.keras.layers.Input]:
"""Returns input layers for a Keras Model."""
feature_spec = self._tf_transform_output.transformed_feature_spec().copy()
feature_spec.pop(self.transformed_label_keys[0])
input_layers = {}
for colname, spec in feature_spec.items():
input_layers[colname] = tf.keras.layers.Input(
name=colname, shape=spec.shape, dtype=spec.dtype)
return input_layers
def get_numeric_feature_columns(self,
include_integer_columns: bool = False
) -> List[FeatureColumn]:
"""Creates a set of feature columns.
Args:
include_integer_columns: Whether integer columns in the examples should be
included in the numeric columns as floats.
Returns:
A list of feature columns.
"""
numeric_columns = []
for feature in self._dataset_schema.feature:
feature_name = feature.name
if feature_name in self.raw_label_keys:
continue
feature_storage_type = _get_feature_storage_type(self._dataset_schema,
feature_name)
if feature_storage_type == tf.int64 and not include_integer_columns:
continue
# NOTE: Int features are treated as both numerical and categorical. For
# example MNIST stores its features as int16 features, but are continuous.
if feature_storage_type == tf.float32 or feature_storage_type == tf.int64:
# Numerical feature.
dim = _get_feature_dim(self._dataset_schema, feature_name)
# Numerical feature normalized in 0-1.
current_feature = tf.feature_column.numeric_column(
feature_name, shape=(dim,), dtype=feature_storage_type)
numeric_columns.append(current_feature)
return numeric_columns
def get_sparse_categorical_feature_columns(
self, include_integer_columns: bool = True) -> List[FeatureColumn]:
"""Creates a set of sparse categorical feature columns.
Args:
include_integer_columns: Whether integer columns in the examples should be
included in the categorical columns.
Returns:
A list of feature columns.
"""
feature_columns = []
for feature in self._dataset_schema.feature:
feature_name = feature.name
if feature_name in self.raw_label_keys:
continue
feature_storage_type = _get_feature_storage_type(self._dataset_schema,
feature_name)
if feature_storage_type == tf.float32:
continue
if feature_storage_type == tf.int64:
if not include_integer_columns:
continue
# Categorical or categorical-set feature stored as an integer(s).
num_buckets = (
self._tf_transform_output.num_buckets_for_transformed_feature(
feature_name))
new_feature_column = tf.feature_column.categorical_column_with_identity(
feature_name, num_buckets=num_buckets)
else:
# Note TFT automatically converts string columns to int columns.
raise ValueError('Unsupported dtype.')
feature_columns.append(new_feature_column)
return feature_columns
def get_embedding_feature_columns(self,
include_integer_columns: bool = True
) -> List[FeatureColumn]:
"""Creates a set of embedding feature columns.
Args:
include_integer_columns: Whether integer columns in the examples should be
included in the embeddings.
Returns:
A list of feature columns.
"""
return [
tf.feature_column.embedding_column(column, dimension=10) for column in
self.get_sparse_categorical_feature_columns(include_integer_columns)
]
def get_dataset(self,
file_pattern: Text,
batch_size: int,
num_epochs: Optional[int] = None,
shuffle: Optional[bool] = True,
shuffle_buffer_size: int = 10000,
shuffle_seed: Optional[int] = None,
prefetch_buffer_size: Optional[int] = None,
reader_num_threads: Optional[int] = None,
parser_num_threads: Optional[int] = None,
sloppy_ordering: bool = False,
drop_final_batch: bool = False) -> tf.data.Dataset:
"""Returns an input_fn that returns a `tf.data.Dataset` from Examples.
Args:
file_pattern: List of files or patterns of file paths containing Example
records. See tf.io.gfile.glob for pattern rules.
batch_size: An int representing the number of records to combine in a
single batch.
num_epochs: Integer specifying the number of times to read through the
dataset. If None, cycles through the dataset forever. Defaults to None.
shuffle: A boolean, indicates whether the input should be shuffled.
Defaults to True.
shuffle_buffer_size: Buffer size of the ShuffleDataset. A large capacity
ensures better shuffling but would increase memory usage and startup
time.
shuffle_seed: Randomization seed to use for shuffling.
prefetch_buffer_size: Number of feature batches to prefetch in order to
improve performance. Recommended value is the number of batches consumed
per training step. Defaults to auto-tune.
reader_num_threads: Number of threads used to read Example records. If >1,
the results will be interleaved. Defaults to 1.
parser_num_threads: Number of threads to use for parsing Example tensors
into a dictionary of Feature tensors. Defaults to 2.
sloppy_ordering: If True, reading performance will be improved at the cost
of non-deterministic ordering. If False, the order of elements produced
is deterministic prior to shuffling (elements are still randomized if
shuffle=True. Note that if the seed is set, then order of elements after
shuffling is deterministic). Defaults to False.
drop_final_batch: If True, and the batch size does not evenly divide the
input dataset size, the final smaller batch will be dropped. Defaults to
False.
Returns:
Returns an input_fn that returns a `tf.data.Dataset`.
"""
# Since we're not applying the transform graph here, we're using Transform
# materialization.
feature_spec = self._tf_transform_output.transformed_feature_spec().copy()
def _pop_labels(features):
label_keys = self.transformed_label_keys
labels = []
for key in label_keys:
labels.append(features.pop(key))
return features, tf.concat(labels, axis=1)
def _gzip_reader_fn(files):
return tf.data.TFRecordDataset(files, compression_type='GZIP')
dataset = tf.data.experimental.make_batched_features_dataset(
file_pattern,
batch_size,
feature_spec,
reader=_gzip_reader_fn,
num_epochs=num_epochs,
shuffle=shuffle,
shuffle_buffer_size=shuffle_buffer_size,
shuffle_seed=shuffle_seed,
prefetch_buffer_size=prefetch_buffer_size,
reader_num_threads=reader_num_threads,
parser_num_threads=parser_num_threads,
sloppy_ordering=sloppy_ordering,
drop_final_batch=drop_final_batch)
return dataset.map(_pop_labels)
def get_serve_tf_examples_fn(self, model: tf.keras.Model):
"""Returns a function that parses a serialized tf.Example and applies TFT."""
model.tft_layer = self._tf_transform_output.transform_features_layer()
@tf.function
def serve_tf_examples_fn(serialized_tf_examples):
"""Returns the output to be used in the serving signature."""
feature_spec = self._tf_transform_output.raw_feature_spec()
feature_spec.pop(self.transformed_label_keys[0])
parsed_features = tf.io.parse_example(serialized_tf_examples,
feature_spec)
transformed_features = model.tft_layer(parsed_features)
return model(transformed_features)
return serve_tf_examples_fn
def _get_feature_storage_type(schema: schema_pb2.Schema,
feature_name: Text) -> tf.dtypes.DType:
"""Get the storage type of at tf.Example feature."""
for feature in schema.feature:
if feature.name == feature_name:
if feature.type == schema_pb2.FeatureType.BYTES:
return tf.string
if feature.type == schema_pb2.FeatureType.FLOAT:
return tf.float32
if feature.type == schema_pb2.FeatureType.INT:
return tf.int64
raise ValueError('Feature not found: {}'.format(feature_name))
def _get_feature_dim(schema: schema_pb2.Schema, feature_name: Text) -> int:
"""Get the dimension of the tf.Example feature."""
for feature in schema.feature:
if feature.name == feature_name:
return feature.shape.dim[0].size
raise ValueError('Feature not found: {}'.format(feature_name))
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