verifyLog function

void verifyLog()

Implementation

void verifyLog() {
  final x = Tensor.fill([1, 1], 0.0);
  x.data = [2.0]; // log(2.0)

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

  final grads = x.grad;
  // d(log(x))/dx = 1/x. For x=2.0, grad = 0.5
  bool ok = closeEnough(grads[0], 0.5);
  print("LOG: ${ok ? '✅ PASS' : '❌ FAIL (Expected 0.5, got ${grads[0]})'}");
}