Version 0.29.0

Major Features and Improvements

Added a simple query based driver that supports Span spec and static_range.
Added e2e rolling window example/test for Span Resolver.
Performance improvement in Transform by avoiding excess encodings and decodings when it materializes transformed examples or generates statistics (both enabled by default).
Added an accessor (.data_view_decode_fn) to the decoder function wrapped in the DataView in Trainer FnArgs.data_accessor.

Starting in this version, following artifacts will be stored in new format, but artifacts produced by older versions can be read in a backwards compatible way:
- Change split sub-folder format to 'Split-<split_name>', this applies to all artifacts that contain splits. Old format '<split_name>' can still be loaded by TFX.
- Change Model artifact's sub-folder name to 'Format-TFMA' for eval model and 'Format-Serving' for serving model. Old Model artifact format ('eval_model_dir'/'serving_model_dir') can still be loaded by TFX.
- Change ExampleStatistics artifact payload to binary proto FeatureStats.pb file. Old payload format (tfrecord stats_tfrecord file) can still be loaded by TFX.
- Change ExampleAnomalies artifact payload to binary proto SchemaDiff.pb file. Old payload format (text proto anomalies.pbtxt file) is deprecated as TFX doesn't have downstream components that take ExampleAnomalies artifact.

CLI requires Apache Airflow 1.10.14 or later. If you are using an older version of airflow, you can still copy runner definition to the DAG directory manually and run using airflow UIs.

The tfx_version custom property of output artifacts is now set by the default publisher to the TFX SDK version.
Depends on absl-py>=0.9,<0.13.
Depends on kfp-pipeline-spec>=0.1.7,<0.2.
Depends on ml-metadata>=0.29.0,<0.30.0.
Depends on packaging>=20,<21.
Depends on struct2tensor>=0.29.0,<0.30.0.
Depends on tensorflow-data-validation>=0.29.0,<0.30.0.
Depends on tensorflow-model-analysis>=0.29.0,<0.30.0.
Depends on tensorflow-transform>=0.29.0,<0.30.0.
Depends on tfx-bsl>=0.29.0,<0.30.0.

Simplified Apache Spark and Flink example deployment scripts by using Beam's SparkRunner and FlinkRunner classes.
Upgraded example Apache Flink deployment to Flink 1.12.1.
Upgraded example Apache Spark deployment to Spark 2.4.7.
Added the "TFX Python function component" notebook tutorial.