private void ensureGraphOutputChannelSpecsIsMutable() {
      if (!((bitField0_ & 0x00000002) != 0)) {
        graphOutputChannelSpecs_ =
            new java.util.ArrayList<
                com.google.cloud.visionai.v1.ProcessorIOSpec.GraphOutputChannelSpec>(
                graphOutputChannelSpecs_);
        bitField0_ |= 0x00000002;
      }
    }
<pre>
For processors with input_channel_specs, the processor must be explicitly
connected to another processor.
</pre>

<code>
repeated .google.cloud.visionai.v1.ProcessorIOSpec.GraphInputChannelSpec graph_input_channel_specs = 3;
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ProcessorIOSpec.java