Pooling across channels?

[Dinesh]

Hi,
Does Caffe already provide functionality to pool across channels? My understanding is that the POOLING layer only allows pooling on pixels within the same (presumably) convolutional channel. I'm looking for something like this "ChannelPoolingLayer" from Mocha: http://mochajl.readthedocs.org/en/latest/user-guide/layers/computation-layer.html#ChannelPoolingLayer

If I had a small number of channels, I could do something hacky like slice the channels and use ELTWISE layer to pool over them, but this is too cumbersome for anything more than a very small # of channels.

[Evan Shelhamer]

No, this isn't currently in Caffe but it's certainly worth including. The channel special case is useful as-is, but generalized pooling is a good pairing with #1486 ND blobs.

Evan Shelhamer

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[Dinesh]

Thank, Evan. I might end up implementing this (most likely the channel-specific case) some time soon. Will post a PR if I do. 

[Zhuotun Zhu]

Hi JD,

Have you posted a PR for Cross Channel Pooling?