public com.google.cloud.vertexai.api.SpeculativeDecodingSpec.Builder
        getSpeculativeDecodingSpecBuilder() {
      bitField0_ |= 0x00020000;
      onChanged();
      return getSpeculativeDecodingSpecFieldBuilder().getBuilder();
    }
<pre>
Optional. Spec for configuring speculative decoding.
</pre>

<code>
.google.cloud.vertexai.v1.SpeculativeDecodingSpec speculative_decoding_spec = 30 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/DeployedModel.java