@java.lang.Override
  public Builder toBuilder() {
    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
  }
<pre>
Model to use for object tracking.
Supported values: "builtin/stable" (the default if unset) and
"builtin/latest".
</pre>

<code>string model = 1;</code>

@return The bytes for model.
java-video-intelligence/proto-google-cloud-video-intelligence-v1p3beta1/src/main/java/com/google/cloud/videointelligence/v1p3beta1/ObjectTrackingConfig.java