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Get the domain associated with the input feature from the schema.
tfdv.get_domain( schema, feature_path )
schema: A Schema protocol buffer.
feature_path: The path of the feature whose domain needs to be found. If a FeatureName is passed, a one-step FeaturePath will be constructed and used. For example, "my_feature" -> types.FeaturePath(["my_feature"])
The domain protocol buffer (one of IntDomain, FloatDomain, StringDomain or BoolDomain) associated with the input feature.
TypeError: If the input schema is not of the expected type.
ValueError: If the input feature is not found in the schema or there is no domain associated with the feature.