how to get objectnav goal string label from "observations["objectgoal"][0]"

[Benson722]

Habitat-Sim version

v0.3.2 (stable)

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❓ Questions and Help

def example():    
    config=habitat.get_config("benchmark/nav/objectnav/objectnav_hm3d.yaml")
    # config = habitat.get_config(config_path="benchmark/nav/pointnav/pointnav_habitat_test.yaml")
    
    with read_write(config):
        # config.habitat.dataset.split = "val"
        agent_config = get_agent_config(sim_config=config.habitat.simulator)
        agent_config.sim_sensors.update(
            {"semantic_sensor": HabitatSimSemanticSensorConfig(height=256, width=256)}
        )
        config.habitat.simulator.turn_angle = 30

    env = habitat.Env(
        config=config
    )

    print("Environment creation successful")
    observations = env.reset()
    print("Destination, distance: {:3f}, Goal(uuid): {:.d}".format(
        env.get_metrics()["distance_to_goal"],
        observations["objectgoal"][0])
    )
    # print("Destination, distance: {:3f}, theta(radians): {:.2f}".format(
    #     observations["pointgoal_with_gps_compass"][0],
    #     observations["pointgoal_with_gps_compass"][1])
    # )
...

I want to get string label about "observations["objectgoal"][0])", which is "sofa" in the code. I don't find it in "observations["objectgoal"]". By the way, the value of observations["objectgoal"][0]) is 5, and the string label in dataset is sofa:

(objectnav/hm3d/v1/train/train.json.gz)

{"episodes": [], "category_to_task_category_id": {"chair": 0, "bed": 1, "plant": 2, "toilet": 3, "tv_monitor": 4, "sofa": 5}, "category_to_scene_annotation_category_id": {"chair": 0, "bed": 1, "plant": 2, "toilet": 3, "tv_monitor": 4, "sofa": 5}}