epoch    0  MSE   12592778.8
epoch  100  MSE      37344.8
epoch  200  MSE      37334.3
epoch  300  MSE      37334.3
epoch  400  MSE      37334.3
epoch  500  MSE      37334.3
gradient descent : [3328.4  785.6  410.8   47.4 -214.5]
normal equation  : [3328.4  785.6  410.8   47.4 -214.5]
  land_m2         10.62
  building_m2      4.88
  bedrooms        27.60
  dist_km        -40.33
  intercept       886.5
test MAE 121.5  RMSE 153.2  R2 0.982
