relu function

Tensor<Vector> relu(Tensor<Vector> v)

Implementation

Tensor<Vector> relu(Tensor<Vector> v) {
  int N = v.data.length;
  Vector outValue = [];
  for (int i = 0; i < N; i = i + 1) {
    double val = v.data[i];
    outValue.add(val > 0.0 ? val : 0.0);
  }
  Tensor<Vector> out = Tensor<Vector>(outValue);
  out.creator = Node(
    [v],
        () {
      for (int i = 0; i < N; i = i + 1) {
        v.grad[i] = v.grad[i] + out.grad[i] * (v.data[i] > 0.0 ? 1.0 : 0.0);
      }
    },
    opName: 'relu_vector',
    cost: N,
  );
  return out;
}