public Builder clearTpu() {
      if (tpuBuilder_ == null) {
        if (resourceCase_ == 2) {
          resourceCase_ = 0;
          resource_ = null;
          onChanged();
        }
      } else {
        if (resourceCase_ == 2) {
          resourceCase_ = 0;
          resource_ = null;
        }
        tpuBuilder_.clear();
      }
      return this;
    }
<pre>
Optional. Defines a TPU resource.
</pre>

<code>
.google.cloud.tpu.v2.QueuedResource.Tpu tpu = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/QueuedResource.java