swishVector function

Tensor<Vector> swishVector(Tensor<Vector> v)

Implementation

Tensor<Vector> swishVector(Tensor<Vector> v) {
  int N = v.data.length;
  Vector outValue = [];

  for (int i = 0; i < N; i = i + 1) {
    double x = v.data[i];
    double sigVal = 1.0 / (1.0 + exp(-x));
    outValue.add(x * sigVal);
  }

  Tensor<Vector> out = Tensor<Vector>(outValue);

  out.creator = Node(
    [v],
        () {
      for (int i = 0; i < N; i = i + 1) {
        double x = v.data[i];
        double sigVal = 1.0 / (1.0 + exp(-x));
        double derivative = sigVal * (1.0 + x * (1.0 - sigVal));
        v.grad[i] = v.grad[i] + out.grad[i] * derivative;
      }
    },
    opName: 'swish_vector',
    cost: N * 2,
  );

  return out;
}