Latex equation of fluid fc layer is not correctly rendered.

[lcy-seso]

I update the documentation of fluid fc layer, and found the Latex equation is not correctly rendered.

My codes are as follows:

    This process can be formulated as follows:

    .. math::

        Out = Act \left({\sum_{i=0}^{N-1}W_iX_i + b}\right)

The html looks like this:

It seems that the escape character \ is removed? I just replace \left( and \right) with ( and ) to fix this.