private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tpu.v2.AccessConfig,
            com.google.cloud.tpu.v2.AccessConfig.Builder,
            com.google.cloud.tpu.v2.AccessConfigOrBuilder>
        getAccessConfigFieldBuilder() {
      if (accessConfigBuilder_ == null) {
        accessConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tpu.v2.AccessConfig,
                com.google.cloud.tpu.v2.AccessConfig.Builder,
                com.google.cloud.tpu.v2.AccessConfigOrBuilder>(
                getAccessConfig(), getParentForChildren(), isClean());
        accessConfig_ = null;
      }
      return accessConfigBuilder_;
    }
<pre>
The access config for the TPU worker.
</pre>

<code>.google.cloud.tpu.v2.AccessConfig access_config = 5;</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/NetworkEndpoint.java