Slice Layer

• Layer type: Slice
• Doxygen Documentation
• Header: ./include/caffe/layers/slice_layer.hpp
• CPU implementation: ./src/caffe/layers/slice_layer.cpp
• CUDA GPU implementation: ./src/caffe/layers/slice_layer.cu

The Slice layer is a utility layer that slices an input layer to multiple output layers along a given dimension (currently num or channel only) with given slice indices.

• Sample

  layer {
    name: "slicer_label"
    type: "Slice"
    bottom: "label"
    ## Example of label with a shape N x 3 x 1 x 1
    top: "label1"
    top: "label2"
    top: "label3"
    slice_param {
      axis: 1
      slice_point: 1
      slice_point: 2
    }
  }
  

axis indicates the target axis; slice_point indicates indexes in the selected dimension (the number of indices must be equal to the number of top blobs minus one).

Parameters

• Parameters (SliceParameter slice_param)
• From ./src/caffe/proto/caffe.proto:

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];
}