public static com.google.cloud.tpu.v2.AcceleratorConfig getDefaultInstance() {
    return DEFAULT_INSTANCE;
  }
<pre>
Required. Topology of TPU in chips.
</pre>

<code>string topology = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The bytes for topology to set.
@return This builder for chaining.
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/AcceleratorConfig.java