code: public void rnnSetPreviousStates(Map<String, Map<String, INDArray>> previousStates) {
          for (Map.Entry<String, Map<String, INDArray>> entry : previousStates.entrySet()) {
              rnnSetPreviousState(entry.getKey(), entry.getValue());
          }
      }
docs: Set the states for all RNN layers, for use in {@link #rnnTimeStep(INDArray...)}
  
  @param previousStates The previous time step states for all layers (key: layer name. Value: layer states)
  @see #rnnGetPreviousStates()