ml-agents/unity-environment/Assets/ML-Agents/Scripts/CoreBrain.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace MLAgents
{
/** \brief An interface which defines the functions needed for a CoreBrain. */
/** There is no need to modify or implement CoreBrain to create a Unity environment.
 */
    public interface CoreBrain
    {

        /// Implement setBrain so let the coreBrain know what brain is using it
        void SetBrain(Brain b);

        /// Implement this method to initialize CoreBrain
        void InitializeCoreBrain(MLAgents.Batcher brainBatcher);

        /// Implement this method to define the logic for deciding actions
        void DecideAction(Dictionary<Agent, AgentInfo> agentInfo);

        /// Implement this method to define what should be displayed in the brain Inspector
        void OnInspector();
    }
}