nd4j-parameter-server-parent/nd4j-parameterserver-model/src/main/java/org/nd4j/parameterserver/model/SubscriberState.java
public static SubscriberState empty() {
        return SubscriberState.builder().serverState("empty").streamId(-1)
                        .parameterUpdaterStatus(Collections.emptyMap()).totalUpdates(-1).isMaster(false).build();
    }
public static SubscriberState empty() {
        return SubscriberState.builder().serverState("empty").streamId(-1)
                        .parameterUpdaterStatus(Collections.emptyMap()).totalUpdates(-1).isMaster(false).build();
    }
Returns an empty subscriber state
with -1 as total updates, master as false
and server state as empty
@return an empty subscriber state