@SuppressWarnings({"rawtypes"})
    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
        int number) {
      switch (number) {
        case 5:
          return internalGetLabels();
        default:
          throw new RuntimeException("Invalid map field number: " + number);
      }
    }
<pre>
Multiple image annotation requests are batched into a single service call.
</pre>

Protobuf type {@code google.cloud.vision.v1.BatchAnnotateImagesRequest}
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/BatchAnnotateImagesRequest.java