eluMatrix function

Tensor<Matrix> eluMatrix(
  1. Tensor<Matrix> m,
  2. double alpha
)

Implementation

Tensor<Matrix> eluMatrix(Tensor<Matrix> m, double alpha) {
  int numRows = m.shape[0];
  int numCols = m.shape[1];
  Matrix mMat = m.value;
  Matrix outValue = [];

  for (int i = 0; i < numRows; i = i + 1) {
    Vector row = [];
    for (int j = 0; j < numCols; j = j + 1) {
      double x = mMat[i][j];
      if (x > 0.0) {
        row.add(x);
      } else {
        row.add(alpha * (exp(x) - 1.0));
      }
    }
    outValue.add(row);
  }

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

  out.creator = Node(
    [m],
        () {
      int length = m.data.length;
      for (int i = 0; i < length; i = i + 1) {
        double x = m.data[i];
        double grad = x > 0.0 ? 1.0 : out.data[i] + alpha;
        m.grad[i] = m.grad[i] + out.grad[i] * grad;
      }
    },
    opName: 'elu_matrix',
    cost: numRows * numCols,
  );

  return out;
}