Confusing expression in description of Simple Network...

[rtalexander]

Hi,

I find the following description in the Simple Network to be a bit confusing:

Prediction = A(\;A(\;X W_h\;)W_o\;)
Where A is an activation function like :ref:`activation_relu`, X is the input and W_h and W_o are weights.

I think I get your point, namely that the expression on the right hand side of Prediction is the approximate pseudo mathematical expression of the simple network, and where A is used to representation an arbitrary mathematical function that takes a matrix as an argument and that returns a matrix (there's a lot of capital letters in that expression, not all of which are matrices). Unfortunately, for me at least, the use of the capital A is confusing, and takes a few moments to figure out that A is itself not a matrix. It might be clearer to replace A with f or some other lower case letter. Just a suggestion.

[bfortuner]

Thank you! Apologies I've been heads down at work. Feel free to post a PR if you think it can be improved! Also looking for fellow maintainers if you're interested.