@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      if (labelId_ != 0L) {
        output.writeInt64(1, labelId_);
      }
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(labelString_)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, labelString_);
      }
      getUnknownFields().writeTo(output);
    }
<pre>
Human readable string of the label.
</pre>

<code>string label_string = 2;</code>

@return The bytes for labelString.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ObjectDetectionPredictionResult.java