Question about env step

Hi! The is_active flag indicates whether agents have already reached their targets, and this applies specifically to the "disappear on target" scenario (i.e., when on_target='finish'). In this case, non-active agents will not block others.

To answer the second question – it depends on the collision system in POGEMA. The movement you described is possible (for both agents) when using the soft collision system. However, if we use the block_both collision system, agent_1 will remain in its initial position. In both cases, agent_2 will be able to move to cell C, since it's not occupied by anyone.

Here is a small illustrative example:

from pogema import BatchAStarAgent, GridConfig, pogema_v0

def main():
    for collision_system in ['block_both', 'soft']:
        print(f'Collision system: {collision_system}')
        env = pogema_v0(grid_config=GridConfig(map="""...""", num_agents=2, size=4, obs_radius=2,
                                               observation_type='POMAPF', on_target='nothing',
                                               agents_xy=[[0, 0], [0, 1]], targets_xy=[[0, 1], [0, 2]],
                                               collision_system=collision_system))
        agent = BatchAStarAgent()
        obs, _ = env.reset()
        env.render()

        env.step(agent.act(obs))
        env.render()

if __name__ == '__main__':
    main()

Which will produce:

Collision system: block_both
 .  .  .  .  .  .  . 
 .                 . 
 .     0  1 |1|    . 
 .                 . 
 .  .  .  .  .  .  . 

 .  .  .  .  .  .  . 
 .                 . 
 .     0 |0| 1     . 
 .                 . 
 .  .  .  .  .  .  . 

Collision system: soft
 .  .  .  .  .  .  . 
 .                 . 
 .     0  1 |1|    . 
 .                 . 
 .  .  .  .  .  .  . 

 .  .  .  .  .  .  . 
 .                 . 
 .     .  0  1     . 
 .                 . 
 .  .  .  .  .  .  .

CognitiveAISystems / pogema

Question about env step #1