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Concat Layer

The Concat layer is a utility layer that concatenates its multiple input blobs to one single output blob.

Parameters

  • Parameters (ConcatParameter concat_param)
    • Optional
      • axis [default 1]: 0 for concatenation along num and 1 for channels.
  • From ./src/caffe/proto/caffe.proto):
message ConcatParameter {
  // The axis along which to concatenate -- may be negative to index from the
  // end (e.g., -1 for the last axis).  Other axes must have the
  // same dimension for all the bottom blobs.
  // By default, ConcatLayer concatenates blobs along the "channels" axis (1).
  optional int32 axis = 2 [default = 1];

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

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