pub fn grad<'a, F, Args, Output, Err>(
f: F,
) -> impl FnMut(Args) -> Result<Output> + 'awhere
F: IntoGrad<'a, Args, Output, Err>,Expand description
Returns a function which computes the gradient of f with the default
argument numbers &[0].
See also [grad_with_arg_nums] for a version that allows specifying the
argument numbers