'''
Date: 2024-11-11 19:31:53
LastEditors: muzhancun muzhancun@stu.pku.edu.cn
LastEditTime: 2025-05-26 21:18:13
FilePath: /MineStudio/minestudio/simulator/callbacks/prev_action.py
'''
import os
import yaml
import numpy as np
from typing import Dict, List, Tuple, Union, Sequence, Mapping, Any, Optional, Literal
from minestudio.simulator.callbacks.callback import MinecraftCallback
from minestudio.utils.register import Registers
avail_keys = ["attack", "use", "inventory", "forward", "back", "left", "right",
"sneak", "sprint", "jump", "drop", "hotbar.1", "hotbar.2", "hotbar.3",
"hotbar.4", "hotbar.5", "hotbar.6", "hotbar.7", "hotbar.8", "hotbar.9",
"camera"]
# @Registers.simulator_callback.register
[docs]
class PrevActionCallback(MinecraftCallback):
"""
A callback that stores the previous action and adds it to the observation.
This callback is useful for tasks where the agent needs to know its previous
action to make a decision.
"""
def __init__(self):
"""
Initializes the PrevActionCallback.
"""
super().__init__()
self.prev_action = None
[docs]
def before_step(self, sim, action):
"""
Stores the action before it is executed.
:param sim: The Minecraft simulator.
:param action: The action to be executed.
:return: The action.
"""
self.prev_action = action
return action
[docs]
def after_step(self, sim, obs, reward, terminated, truncated, info):
"""
Adds the previous action to the observation.
:param sim: The Minecraft simulator.
:param obs: The observation from the simulator.
:param reward: The reward from the simulator.
:param terminated: Whether the episode has terminated.
:param truncated: Whether the episode has been truncated.
:param info: Additional information from the simulator.
:return: The modified observation, reward, terminated, truncated, and info.
"""
obs["env_prev_action"] = {k: v for k, v in self.prev_action.items() if k in avail_keys}
return obs, reward, terminated, truncated, info
[docs]
def after_reset(self, sim, obs, info):
"""
Adds a default previous action to the observation after a reset.
:param sim: The Minecraft simulator.
:param obs: The observation from the simulator.
:param info: Additional information from the simulator.
:return: The modified observation and info.
"""
obs["env_prev_action"] = {
"attack": np.array(0), "use": np.array(0), "inventory": np.array(0),
"forward": np.array(0), "back": np.array(0), "left": np.array(0), "right": np.array(0),
"sneak": np.array(0), "sprint": np.array(0), "jump": np.array(0), "drop": np.array(0),
"hotbar.1": np.array(0), "hotbar.2": np.array(0), "hotbar.3": np.array(0), "hotbar.4": np.array(0), "hotbar.5": np.array(0),
"hotbar.6": np.array(0), "hotbar.7": np.array(0), "hotbar.8": np.array(0), "hotbar.9": np.array(0),
"camera": np.array([0, 0]),
}
return obs, info
