MATLAB: How to enable 3D deep learning support for convolution layer

Question

I am trying to implement a point cloud classification network (3DmFV-Net) using MATLAB's new 3D layers support and was unable to find a 3D concatenation layer.

For 2D there is depthConcatenationLayer(), is there a 3D equivalent?

Answer 1

You can use the 'concatenationLayer' by passing depth dimension as 'Dim' to concatenate along depth. The 'Dim' is 4 for 3D data and 3 for 2D data. Please refer to the following link for more information:

https://www.mathworks.com/help/releases/R2019b/deeplearning/ref/nnet.cnn.layer.concatenationlayer.html