The Grid World environment

The Grid world as described in the Task is shown below:

You are required to write a program to move the agent to the goal. To use the gridworld, import gridworld.py (your script should be in the same directory as gridworld.py)

Using Gridworld

import gridworld

Then you can create a world object and access various constants and the step function which is used to move the agent

# create a world object
world = gridworld.GridWorld()

# access Height and Width
print(world.WORLD_WIDTH)
print(world.WORLD_HEIGHT)

# access the obstacles
print(wolrd.obstacles)

# access start and goal position
print(world.START)
print(world.GOAL)

# access the actions, for others see gridworld.py
print(world.ACTION_UP)

# run the step function
present_state = world.START

next_state, reward = world.step(present_state, world.ACTION_UP)

print(next_state)
print(reward)

output
15
10
[[2, 3], [3, 3], [7, 3], [8, 3], [9, 3], [7, 8], [8, 8], [9, 8]]
[6, 1]
[8, 11]
0
[5, 0]
-1

Important Notes

• In the grid world the origin is at the top left corner and the coordinates are specified as (y,x) and not (x,y).
• You should not make any changes to gridworld.py