code: public Map<String, INDArray> feedForward(INDArray[] input, int layerTillIndex,boolean train) {
          setInputs(input);
          return feedForward(train, layerTillIndex);
      }
docs: Conduct forward pass using an array of inputs
  
  @param input An array of ComputationGraph inputs
  @param layerTillIndex the index of the layer to feed forward to
  @param train If true: do forward pass at training time; false: do forward pass at test time
  @return A map of activations for each layer (not each GraphVertex). Keys = layer name, values = layer activations