N-d tiling (aka repmat)

[petergehler]

I am looking for a N-d tiling operation (aka repmat in matlab) and did not find one in the current dev branch. The concat layer does provide some of its functionality already. Is there an easy way to stich it together with current layers already, otherwise I would create a new one based on the concat implementation. Any hints?

[petergehler]

I wrote a layer that does replicate and tile the input blob, so to have the same functionality of matlabs repmat. You can replicate channels, height, and width. The implementation right now is brute force, in both forward and backward pass, the code walks over all elements of the blob. Maybe a smarter implementation would use the split and concat layer (and extend the latter one to concat other dimensions). It works for me, I can create a pull request if this is thought to be of interest.

[shelhamer]

Can you explain the purpose of this layer? If it is to make a blob for input to multiple layers Caffe can do this by declaring a top blob as the bottom of several layers already and constructing the DAG model accordingly. If you can motivate the tiling layer or anyone else chimes in with the need then please PR it to dev.

[shelhamer]

Satisfied by #2083.

[haihaoshen]

Hi, would you take a look TileLayer Usage #4422?