// See if all inputs can give us linear gamma. If not, leave it.
std::vector<Node *> nonlinear_inputs;
find_all_nonlinear_inputs(node, &nonlinear_inputs);
// See if all inputs can give us linear gamma. If not, leave it.
std::vector<Node *> nonlinear_inputs;
find_all_nonlinear_inputs(node, &nonlinear_inputs);