x | is parameter arguments to the function, other components are nan. |
x_index | is the variable index, on the tape, for the arguments to this function. This size of x_index is n, the number of arguments to this function. |
y_index | is the variable index, on the tape, for the results for this function. This size of y_index is m, the number of results for this function. |
var_sparsity | On input, for j = 0, ... , n-1, the sparsity pattern with index x_index[j], is the sparsity for the j-th argument to this atomic function. On input, for i = 0, ... , m-1, the sparsity pattern with index y_index[i], is empty. On output, it is the sparsity for the j-th result for this atomic function. |