verifySigmoid function

void verifySigmoid()

Implementation

void verifySigmoid() {
  final x = Tensor.fromList([1, 1], [0.0]);

  final loss = x.sigmoid().sum();
  loss.backward();

  final grads = x.grad;
  bool ok = closeEnough(grads[0], 0.25);
  print(
    "SIGMOID: ${ok ? '✅ PASS' : '❌ FAIL (Expected 0.25, got ${grads[0]})'}",
  );
}