vectorELU function

Tensor<Vector> vectorELU(
  1. Tensor<Vector> v, {
  2. double alpha = 1.0,
})

Mathematical operation for the ELU function on a vector.

Implementation

Tensor<Vector> vectorELU(Tensor<Vector> v, {double alpha = 1.0}) {
  int N = v.value.length;
  Vector outValue = [];
  for (int i = 0; i < N; i++) {
    outValue.add(v.value[i] > 0 ? v.value[i] : alpha * (exp(v.value[i]) - 1));
  }
  Tensor<Vector> out = Tensor<Vector>(outValue);

  out.creator = Node([v], () {
    for (int i = 0; i < N; i++) {
      v.grad[i] += out.grad[i] * (v.value[i] > 0 ? 1.0 : out.value[i] + alpha);
    }
  }, opName: 'elu', cost: N);
  return out;
}