I have this Irradiance equation : `E = nMn^T', with n^T equals to n transposed.
Where:
n: normal map of size (BxHxWxC), B=batch_size,H=height, W=width, C=3=Color channels.
M: 4x4 Matrix, one for each channel, so I guess it's Bx4x4x3
How can I vectorize the aforementioned equation in order to get irradiance in shape : BxHxWxC?