A TensorFlow operator that realizes convolutions in 4D by performing several 3D convolutions.
Performs a convolution of the (t, z, y, x) dimensions of a tensor with
shape (b, c, l, d, h, w) with k filters. The output tensor will be of
shape (b, k, l', d', h', w'). (l', d', h', w') will be smaller than
(l, d, h, w) if a valid padding was chosen.