packageUris property

Cloud Storage paths (gs://…) of packages for [custom prediction routines](/ml-engine/docs/tensorflow/custom-prediction-routines) or [scikit-learn pipelines with custom code](/ml-engine/docs/scikit/exporting-for-prediction#custom-pipeline-code).

For a custom prediction routine, one of these packages must contain your Predictor class (see [predictionClass](#Version.FIELDS.prediction_class)). Additionally, include any dependencies used by your Predictor or scikit-learn pipeline uses that are not already included in your selected [runtime version](/ml-engine/docs/tensorflow/runtime-version-list). If you specify this field, you must also set [runtimeVersion](#Version.FIELDS.runtime_version) to 1.4 or greater.

Optional.