public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
    return TpuStubSettings.defaultGrpcTransportProviderBuilder();
  }
Returns a builder for the default ChannelProvider for this service.
java-tpu/google-cloud-tpu/src/main/java/com/google/cloud/tpu/v1/TpuSettings.java