import os import mujoco_py.builder import numpy as np from gym import utils from gym.envs.mujoco import MujocoEnv from alr_envs.envs.mujoco.beerpong.deprecated.beerpong_reward_staged import BeerPongReward class BeerPongEnv(MujocoEnv, utils.EzPickle): def __init__(self, frame_skip=2): self._steps = 0 # Small Context -> Easier. Todo: Should we do different versions? # self.xml_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "assets", # "beerpong_wo_cup" + ".xml") # self._cup_pos_min = np.array([-0.32, -2.2]) # self._cup_pos_max = np.array([0.32, -1.2]) self.xml_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "../assets", "beerpong_wo_cup_big_table" + ".xml") self._cup_pos_min = np.array([-1.42, -4.05]) self._cup_pos_max = np.array([1.42, -1.25]) self._start_pos = np.array([0.0, 1.35, 0.0, 1.18, 0.0, -0.786, -1.59]) self._start_vel = np.zeros(7) self.release_step = 100 # time step of ball release self.ep_length = 600 // frame_skip self.reward_function = BeerPongReward() self.repeat_action = frame_skip self.model = None self.site_id = lambda x: self.model.site_name2id(x) self.body_id = lambda x: self.model.body_name2id(x) MujocoEnv.__init__(self, self.xml_path, frame_skip=1) utils.EzPickle.__init__(self) @property def start_pos(self): return self._start_pos @property def start_vel(self): return self._start_vel def reset(self): self.reward_function.reset() return super().reset() def reset_model(self): init_pos_all = self.init_qpos.copy() init_pos_robot = self.start_pos init_vel = np.zeros_like(init_pos_all) self._steps = 0 start_pos = init_pos_all start_pos[0:7] = init_pos_robot # TODO: Ask Max why we need to set the state twice. self.set_state(start_pos, init_vel) start_pos[7::] = self.sim.data.site_xpos[self.site_id("init_ball_pos"), :].copy() self.set_state(start_pos, init_vel) xy = self.np_random.uniform(self._cup_pos_min, self._cup_pos_max) xyz = np.zeros(3) xyz[:2] = xy xyz[-1] = 0.840 self.sim.model.body_pos[self.body_id("cup_table")] = xyz return self._get_obs() def step(self, a): crash = False for _ in range(self.repeat_action): applied_action = a + self.sim.data.qfrc_bias[:len(a)].copy() / self.model.actuator_gear[:, 0] try: self.do_simulation(applied_action, self.frame_skip) self.reward_function.initialize(self) # self.reward_function.check_contacts(self.sim) # I assume this is not important? if self._steps < self.release_step: self.sim.data.qpos[7::] = self.sim.data.site_xpos[self.site_id("init_ball_pos"), :].copy() self.sim.data.qvel[7::] = self.sim.data.site_xvelp[self.site_id("init_ball_pos"), :].copy() crash = False except mujoco_py.builder.MujocoException: crash = True ob = self._get_obs() if not crash: reward, reward_infos = self.reward_function.compute_reward(self, applied_action) is_collided = reward_infos['is_collided'] done = is_collided or self._steps == self.ep_length - 1 self._steps += 1 else: reward = -30 done = True reward_infos = {"success": False, "ball_pos": np.zeros(3), "ball_vel": np.zeros(3), "is_collided": False} infos = dict( reward=reward, action=a, q_pos=self.sim.data.qpos[0:7].ravel().copy(), q_vel=self.sim.data.qvel[0:7].ravel().copy(), sim_crash=crash, ) infos.update(reward_infos) return ob, reward, done, infos def _get_obs(self): theta = self.sim.data.qpos.flat[:7] theta_dot = self.sim.data.qvel.flat[:7] ball_pos = self.data.get_body_xpos("ball").copy() cup_goal_diff_final = ball_pos - self.data.get_site_xpos("cup_goal_final_table").copy() cup_goal_diff_top = ball_pos - self.data.get_site_xpos("cup_goal_table").copy() return np.concatenate([ np.cos(theta), np.sin(theta), theta_dot, cup_goal_diff_final, cup_goal_diff_top, self.sim.model.body_pos[self.body_id("cup_table")][:2].copy(), [self._steps], ]) @property def dt(self): return super(BeerPongEnv, self).dt * self.repeat_action class BeerPongEnvFixedReleaseStep(BeerPongEnv): def __init__(self, frame_skip=2): super().__init__(frame_skip) self.release_step = 62 # empirically evaluated for frame_skip=2! class BeerPongEnvStepBasedEpisodicReward(BeerPongEnv): def __init__(self, frame_skip=2): super().__init__(frame_skip) self.release_step = 62 # empirically evaluated for frame_skip=2! def step(self, a): if self._steps < self.release_step: return super(BeerPongEnvStepBasedEpisodicReward, self).step(a) else: reward = 0 done = False while not done: sub_ob, sub_reward, done, sub_infos = super(BeerPongEnvStepBasedEpisodicReward, self).step( np.zeros(a.shape)) reward += sub_reward infos = sub_infos ob = sub_ob ob[-1] = self.release_step + 1 # Since we simulate until the end of the episode, PPO does not see the # internal steps and thus, the observation also needs to be set correctly return ob, reward, done, infos # class ALRBeerBongEnvStepBased(ALRBeerBongEnv): # def __init__(self, frame_skip=1, apply_gravity_comp=True, noisy=False, rndm_goal=False, cup_goal_pos=None): # super().__init__(frame_skip, apply_gravity_comp, noisy, rndm_goal, cup_goal_pos) # self.release_step = 62 # empirically evaluated for frame_skip=2! # # def step(self, a): # if self._steps < self.release_step: # return super(ALRBeerBongEnvStepBased, self).step(a) # else: # reward = 0 # done = False # while not done: # sub_ob, sub_reward, done, sub_infos = super(ALRBeerBongEnvStepBased, self).step(np.zeros(a.shape)) # if not done or sub_infos['sim_crash']: # reward += sub_reward # else: # ball_pos = self.sim.data.body_xpos[self.sim.model._body_name2id["ball"]].copy() # cup_goal_dist_final = np.linalg.norm(ball_pos - self.sim.data.site_xpos[ # self.sim.model._site_name2id["cup_goal_final_table"]].copy()) # cup_goal_dist_top = np.linalg.norm(ball_pos - self.sim.data.site_xpos[ # self.sim.model._site_name2id["cup_goal_table"]].copy()) # if sub_infos['success']: # dist_rew = -cup_goal_dist_final ** 2 # else: # dist_rew = -0.5 * cup_goal_dist_final ** 2 - cup_goal_dist_top ** 2 # reward = reward - sub_infos['action_cost'] + dist_rew # infos = sub_infos # ob = sub_ob # ob[-1] = self.release_step + 1 # Since we simulate until the end of the episode, PPO does not see the # # internal steps and thus, the observation also needs to be set correctly # return ob, reward, done, infos if __name__ == "__main__": env = BeerPongEnv(frame_skip=2) env.seed(0) # env = ALRBeerBongEnvStepBased(frame_skip=2) # env = ALRBeerBongEnvStepBasedEpisodicReward(frame_skip=2) # env = ALRBeerBongEnvFixedReleaseStep(frame_skip=2) import time env.reset() env.render("human") for i in range(600): # ac = 10 * env.action_space.sample() ac = 0.05 * np.ones(7) obs, rew, d, info = env.step(ac) env.render("human") if d: print('reward:', rew) print('RESETTING') env.reset() time.sleep(1) env.close()