private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo,
            com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo.Builder,
            com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfoOrBuilder>
        getTrackInfoFieldBuilder() {
      if (trackInfoBuilder_ == null) {
        trackInfoBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo,
                com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo.Builder,
                com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfoOrBuilder>(
                trackInfo_, ((bitField0_ & 0x00000008) != 0), getParentForChildren(), isClean());
        trackInfo_ = null;
      }
      return trackInfoBuilder_;
    }
<pre>
Track related information. All the tracks that are live at this timestamp.
It only exists if tracking is enabled.
</pre>

<code>
repeated .google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo track_info = 4;
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OccupancyCountingPredictionResult.java