docs: public List<INDArray> rnnActivateUsingStoredState(INDArray input, boolean training, boolean storeLastForTBPTT) {
          return ffToLayerActivationsDetached(training, FwdPassType.RNN_ACTIVATE_WITH_STORED_STATE, storeLastForTBPTT, layers.length-1, input, mask, null, false);
      }