For adding the first derivatives term in the NN fitting cost function, we need the cross derivatives d^2/dx dbeta to calculate the gradient.
These derivatives might be useful also for VMC optimization (see http://lanl.arxiv.org/abs/cond-mat/0611094v2).
AC:
the FFNN library should have a method for calling these derivatives
For adding the first derivatives term in the NN fitting cost function, we need the cross derivatives d^2/dx dbeta to calculate the gradient. These derivatives might be useful also for VMC optimization (see http://lanl.arxiv.org/abs/cond-mat/0611094v2).
AC: