@SuppressWarnings({"rawtypes"})
    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMutableMapFieldReflection(
        int number) {
      switch (number) {
        case 24:
          return internalGetMutableLabels();
        default:
          throw new RuntimeException("Invalid map field number: " + number);
      }
    }
<pre>
A TPU instance.
</pre>

Protobuf type {@code google.cloud.tpu.v1.Node}
java-tpu/proto-google-cloud-tpu-v1/src/main/java/com/google/cloud/tpu/v1/Node.java