private void maybeForceBuilderInitialization() {
      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
        getFeatureAttributionsFieldBuilder();
      }
    }
<pre>
Attribution that explains a particular prediction output.
</pre>

Protobuf type {@code google.cloud.vertexai.v1.Attribution}
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Attribution.java