@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    for (int i = 0; i < webEntities_.size(); i++) {
      output.writeMessage(1, webEntities_.get(i));
    }
    for (int i = 0; i < fullMatchingImages_.size(); i++) {
      output.writeMessage(2, fullMatchingImages_.get(i));
    }
    for (int i = 0; i < partialMatchingImages_.size(); i++) {
      output.writeMessage(3, partialMatchingImages_.get(i));
    }
    for (int i = 0; i < pagesWithMatchingImages_.size(); i++) {
      output.writeMessage(4, pagesWithMatchingImages_.get(i));
    }
    for (int i = 0; i < visuallySimilarImages_.size(); i++) {
      output.writeMessage(6, visuallySimilarImages_.get(i));
    }
    for (int i = 0; i < bestGuessLabels_.size(); i++) {
      output.writeMessage(8, bestGuessLabels_.get(i));
    }
    getUnknownFields().writeTo(output);
  }
<pre>
The service's best guess as to the topic of the request image.
Inferred from similar images on the open web.
</pre>

<code>repeated .google.cloud.vision.v1p4beta1.WebDetection.WebLabel best_guess_labels = 8;
</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/WebDetection.java