public final int getNumber() {
          if (this == UNRECOGNIZED) {
            throw new java.lang.IllegalArgumentException(
                "Can't get the number of an unknown enum value.");
          }
          return value;
        }
<pre>
Shows which region contributed to the image prediction by outlining
the region.
</pre>

<code>OUTLINES = 2;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ExplanationMetadata.java