public com.google.cloud.vertexai.api.SpeculativeDecodingSpec.DraftModelSpeculation.Builder
        getDraftModelSpeculationBuilder() {
      return getDraftModelSpeculationFieldBuilder().getBuilder();
    }
<pre>
draft model speculation.
</pre>

<code>
.google.cloud.vertexai.v1.SpeculativeDecodingSpec.DraftModelSpeculation draft_model_speculation = 2;
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SpeculativeDecodingSpec.java