a.java

while (change >= tolerance)
  {
    change = 0.0;
    for (int i = 1; i < path.length - 1; i++)
    {
      for (int j = 0; j < path[i].length; j++)
      {
        double aux = newPath[i][j];
        newPath[i][j] += (weight_data * (path[i][j] - newPath[i][j])) + (weight_smooth * (newPath[i - 1][j] + newPath[i + 1][j] - (2.0 * newPath[i][j])));
        change += Math.abs(aux - newPath[i][j]);
      }
    }
  }
    

b.py

while change >= tolerance:
    change = 0.0
        for i in range(1, len(path) - 1):
            for j in range(0, len(path[i])):
                aux = newPath[i][j]
                index+=1
                newPath[i][j] += (weight_data * (path[i][j] - newPath[i][j])) + (weight_smooth  * (newPath[i - 1][j] + newPath[i + 1][j] - (2.0 * newPath[i][j])))
                change += abs(aux - newPath[i][j])