. The CNN outputs are 𝑒 𝑘 . The activation function at the last layer is the Rectified Linear Unit (ReLU) activation to ensure the non-negativity of 𝑒 𝑘 . The expected probability of the 𝑘-th class is 𝑝k = 𝛼 𝑘 /𝑆, where 𝛼 𝑘 = 𝑒 𝑘 + 1.