private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.OperatorDefinition,
            com.google.cloud.visionai.v1.OperatorDefinition.Builder,
            com.google.cloud.visionai.v1.OperatorDefinitionOrBuilder>
        getOperatorDefinitionFieldBuilder() {
      if (operatorDefinitionBuilder_ == null) {
        operatorDefinitionBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.OperatorDefinition,
                com.google.cloud.visionai.v1.OperatorDefinition.Builder,
                com.google.cloud.visionai.v1.OperatorDefinitionOrBuilder>(
                getOperatorDefinition(), getParentForChildren(), isClean());
        operatorDefinition_ = null;
      }
      return operatorDefinitionBuilder_;
    }
<pre>
The definition of the operator.
</pre>

<code>.google.cloud.visionai.v1.OperatorDefinition operator_definition = 5;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Operator.java