Writing the Algorithm (Softmax and Classification)

Writing the softmax function

We need to write the softmax() activation function to complete forward propagation. As it turns out, we can implement softmax() in two lines of code—but those two lines require some attention.

Here is the mathematical formula of the softmax:

$$\large{\text{softmax}(l_i) = \frac{e^{l_i}}{\sum{e^l}}}$$

And that formula converted to code: