Function negative_grid

rl/grid_world.py:126–141

(step_cost=-0.1)

def negative_grid(step_cost=-0.1):
  # in this game we want to try to minimize the number of moves
  # so we will penalize every move
  g = standard_grid()
  g.rewards.update({
    (0, 0): step_cost,
    (0, 1): step_cost,
    (0, 2): step_cost,
    (1, 0): step_cost,
    (1, 2): step_cost,
    (2, 0): step_cost,
    (2, 1): step_cost,
    (2, 2): step_cost,
    (2, 3): step_cost,
  })
  return g