A map of the fields to be passed to the TensorFlow Serving service. This map describes the required input fields and their type and will be used to extract the correct field from the Spark DataFrame (by name). E.g. a to call a TensorFlow Serving instance which requires an input of customer_usage of type DT_DOUBLE this map will be used to take the field customer_usage from inputView and create the required request of data type DT_DOUBLE. For this stage to work the customer_usage type within Spark must be of DoubleType.