[INFO] Calculating top-5 error rate in Caffe

[joyhuang9473]

In train_val.prototxt:

layer {
  name: "accuracy_top_5"
  type: "Accuracy"
  bottom: "fc8"
  bottom: "label"
  top: "accuracy_top_5"
  accuracy_param {
    top_k: 5
  }
  include {
    phase: TEST
  }
}