public String getReferencePredictorArn() {
        return this.referencePredictorArn;
    }
<p>
The ARN of the predictor to retrain or upgrade. This parameter is only used when retraining or upgrading a
predictor. When creating a new predictor, do not specify a value for this parameter.
</p>
<p>
When upgrading or retraining a predictor, only specify values for the <code>ReferencePredictorArn</code> and
<code>PredictorName</code>. The value for <code>PredictorName</code> must be a unique predictor name.
</p>

@return The ARN of the predictor to retrain or upgrade. This parameter is only used when retraining or upgrading
        a predictor. When creating a new predictor, do not specify a value for this parameter.</p>
        <p>
        When upgrading or retraining a predictor, only specify values for the <code>ReferencePredictorArn</code>
        and <code>PredictorName</code>. The value for <code>PredictorName</code> must be a unique predictor name.
aws-java-sdk-forecast/src/main/java/com/amazonaws/services/forecast/model/CreateAutoPredictorRequest.java