code: public INDArray[] output(boolean train, INDArray... input) {
          return output(train, (MemoryWorkspace)null, input);
      }
docs: Return an array of network outputs (predictions), given the specified network inputs
  Network outputs are for output layers only.
  
  @param train If true: do forward pass at training time; false: do forward pass at test time
  @param input Inputs to the network
  @return Output activations (order: same as defined in network configuration)