private org.nd4j.shade.protobuf.RepeatedFieldBuilderV3<
          org.nd4j.ir.TensorNamespace.StringStringEntryProto, org.nd4j.ir.TensorNamespace.StringStringEntryProto.Builder, org.nd4j.ir.TensorNamespace.StringStringEntryProtoOrBuilder> 
          getExternalDataFieldBuilder() {
        if (externalDataBuilder_ == null) {
          externalDataBuilder_ = new org.nd4j.shade.protobuf.RepeatedFieldBuilderV3<