if (layerWiseConfigurations.getBackpropType() == BackpropType.TruncatedBPTT) {
            doTruncatedBPTT(features, labels, featuresMask, labelsMask, workspaceMgr);
        } else {
            if (solver == null) {
                try (MemoryWorkspace wsO = Nd4j.getMemoryManager().scopeOutOfWorkspaces()) {