private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tpu.v2alpha1.AcceleratorConfig,
            com.google.cloud.tpu.v2alpha1.AcceleratorConfig.Builder,
            com.google.cloud.tpu.v2alpha1.AcceleratorConfigOrBuilder>
        getAcceleratorConfigFieldBuilder() {
      if (acceleratorConfigBuilder_ == null) {
        acceleratorConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tpu.v2alpha1.AcceleratorConfig,
                com.google.cloud.tpu.v2alpha1.AcceleratorConfig.Builder,
                com.google.cloud.tpu.v2alpha1.AcceleratorConfigOrBuilder>(
                getAcceleratorConfig(), getParentForChildren(), isClean());
        acceleratorConfig_ = null;
      }
      return acceleratorConfigBuilder_;
    }
<pre>
The AccleratorConfig for the TPU Node.
</pre>

<code>.google.cloud.tpu.v2alpha1.AcceleratorConfig accelerator_config = 44;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Node.java