base_model The resource name of the model to use as a baseline to train
the custom model. If unset, we use the default base model
provided by Google Translate. Format:
source_language_code Output only. Inferred from the dataset.
The source languge (The BCP-47 language code)
that is used for training.
target_language_code Output only. The target languge (The BCP-47
language code) that is used for training.