public com.google.cloud.dialogflow.v2beta1.KnowledgeBase getKnowledgeBase() {
    return knowledgeBase_ == null
        ? com.google.cloud.dialogflow.v2beta1.KnowledgeBase.getDefaultInstance()
        : knowledgeBase_;
  }
public com . google . cloud . dialogflow . v2beta1 . KnowledgeBase getKnowledgeBase ( ) { return knowledgeBase_ == null ? com . google . cloud . dialogflow . v2beta1 . KnowledgeBase . getDefaultInstance ( ) : knowledgeBase_ ; }
<pre>
Required. The knowledge base to update.
</pre>

<code>.google.cloud.dialogflow.v2beta1.KnowledgeBase knowledge_base = 1;</code>