code: public static void setLearningRate(ComputationGraph net, String layerName, ISchedule lrSchedule) {
          setLearningRate(net, layerName, Double.NaN, lrSchedule, true);
      }
docs: Set the learning rate schedule for a single layer in the network to the specified value.<br>
  Note also that {@link #setLearningRate(ComputationGraph, ISchedule)} should also be used in preference, when all
  layers need to be set to a new LR schedule.<br>
  This schedule will replace any/all existing schedules, and also any fixed learning rate values.<br>
  Note also that the iteration/epoch counts will <i>not</i> be reset. Use {@link ComputationGraphConfiguration#setIterationCount(int)}
  and {@link ComputationGraphConfiguration#setEpochCount(int)} if this is required
  
  @param layerName  Name of the layer to set the LR schedule for
  @param lrSchedule New learning rate for a single layer