ml-agents/Project/Assets/ML-Agents/Examples/Bouncer/Scripts/BouncerTarget.cs

using UnityEngine;
using Unity.MLAgents;

public class BouncerTarget : MonoBehaviour
{
    // Update is called once per frame
    void FixedUpdate()
    {
        gameObject.transform.Rotate(new Vector3(1, 0, 0), 0.5f);
    }

    void OnTriggerEnter(Collider collision)
    {
        var agent = collision.gameObject.GetComponent<Agent>();
        if (agent != null)
        {
            agent.AddReward(1f);
            Respawn();
        }
    }

    public void Respawn()
    {
        gameObject.transform.localPosition =
            new Vector3(
                (1 - 2 * Random.value) * 5f,
                2f + Random.value * 5f,
                (1 - 2 * Random.value) * 5f);
    }
}