Concat是将多个bottom合并成一个top
slice层把一个bottom分解成多个top

slice层三个参数:
axis:默认为1，切分channel维度
slice_dim:过时参数同axis,不支持负数
slice_point：切分点,没有设置的时候则对axis进行均匀分解

message SliceParameter {
  // The axis along which to slice -- may be negative to index from the end
  // (e.g., -1 for the last axis).
  // By default, SliceLayer concatenates blobs along the "channels" axis (1).
  optional int32 axis = 3 [default = 1];
  repeated uint32 slice_point = 2;

  // DEPRECATED: alias for "axis" -- does not support negative indexing.
  optional uint32 slice_dim = 1 [default = 1];
}

实例

layer {
  name: "slice1"
  type: "Slice"
  bottom: "conv_blob40"
  top: "cat_blob7"
  top: "cat_blob8"
  top: "cat_blob9"
  slice_param {
    axis: 1
  }
}