lit_sb3.wrappers.frame_skip
[docs]
module
lit_sb3.wrappers.frame_skip
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34 | from __future__ import annotations
from typing import Any
import gymnasium as gym
from lit_sb3.core.types import GymStepReturn
class FrameSkip(gym.Wrapper):
"""Return only every ``skip``-th frame (frameskipping).
:param env: Gym environment.
:param skip: Number of frames to skip (repeat action for).
"""
def __init__(self, env: gym.Env, skip: int = 4) -> None:
super().__init__(env)
self._skip = skip
def step(self, action: Any) -> GymStepReturn:
"""Step the environment, repeating action and summing reward.
:param action: The action to repeat.
:return: observation, cumulative reward, terminated, truncated, info.
"""
total_reward = 0.0
for _ in range(self._skip):
obs, reward, terminated, truncated, info = self.env.step(action)
total_reward += float(reward)
if terminated or truncated:
break
return obs, total_reward, terminated, truncated, info
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