236 lines
8.8 KiB
Python
236 lines
8.8 KiB
Python
import copy
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from typing import Optional
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from gym.envs.mujoco.hopper_v3 import HopperEnv
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import numpy as np
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import os
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MAX_EPISODE_STEPS_HOPPERJUMP = 250
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class HopperJumpEnv(HopperEnv):
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"""
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Initialization changes to normal Hopper:
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- terminate_when_unhealthy: True -> False
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- healthy_reward: 1.0 -> 2.0
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- healthy_z_range: (0.7, float('inf')) -> (0.5, float('inf'))
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- healthy_angle_range: (-0.2, 0.2) -> (-float('inf'), float('inf'))
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- exclude_current_positions_from_observation: True -> False
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"""
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def __init__(
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self,
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xml_file='hopper_jump.xml',
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forward_reward_weight=1.0,
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ctrl_cost_weight=1e-3,
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healthy_reward=2.0, # 1 step
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contact_weight=2.0, # 0 step
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height_weight=10.0, # 3 step
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dist_weight=3.0, # 3 step
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terminate_when_unhealthy=False,
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healthy_state_range=(-100.0, 100.0),
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healthy_z_range=(0.5, float('inf')),
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healthy_angle_range=(-float('inf'), float('inf')),
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reset_noise_scale=5e-3,
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exclude_current_positions_from_observation=False,
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sparse=False,
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):
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self.sparse = sparse
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self._height_weight = height_weight
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self._dist_weight = dist_weight
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self._contact_weight = contact_weight
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self.max_height = 0
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self.goal = 0
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self._steps = 0
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self.contact_with_floor = False
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self.init_floor_contact = False
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self.has_left_floor = False
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self.contact_dist = None
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xml_file = os.path.join(os.path.dirname(__file__), "assets", xml_file)
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super().__init__(xml_file, forward_reward_weight, ctrl_cost_weight, healthy_reward, terminate_when_unhealthy,
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healthy_state_range, healthy_z_range, healthy_angle_range, reset_noise_scale,
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exclude_current_positions_from_observation)
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# increase initial height
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self.init_qpos[1] = 1.5
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def step(self, action):
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self._steps += 1
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self.do_simulation(action, self.frame_skip)
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height_after = self.get_body_com("torso")[2]
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site_pos_after = self.data.get_site_xpos('foot_site')
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self.max_height = max(height_after, self.max_height)
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has_floor_contact = self._is_floor_foot_contact() if not self.contact_with_floor else False
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if not self.init_floor_contact:
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self.init_floor_contact = has_floor_contact
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if self.init_floor_contact and not self.has_left_floor:
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self.has_left_floor = not has_floor_contact
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if not self.contact_with_floor and self.has_left_floor:
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self.contact_with_floor = has_floor_contact
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ctrl_cost = self.control_cost(action)
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costs = ctrl_cost
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done = False
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goal_dist = np.linalg.norm(site_pos_after - np.array([self.goal, 0, 0]))
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if self.contact_dist is None and self.contact_with_floor:
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self.contact_dist = goal_dist
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rewards = 0
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if not self.sparse or (self.sparse and self._steps >= MAX_EPISODE_STEPS_HOPPERJUMP):
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healthy_reward = self.healthy_reward
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distance_reward = goal_dist * self._dist_weight
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height_reward = (self.max_height if self.sparse else self.get_body_com("torso")[2]) * self._height_weight
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contact_reward = (self.contact_dist or 5) * self._contact_weight
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# dist_reward = self._forward_reward_weight * (-3 * goal_dist + 10 * self.max_height - 2 * contact_dist)
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rewards = self._forward_reward_weight * (distance_reward + height_reward + contact_reward + healthy_reward)
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observation = self._get_obs()
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reward = rewards - costs
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info = dict(
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height=height_after,
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x_pos=site_pos_after,
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max_height=self.max_height,
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goal=self.goal,
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goal_dist=goal_dist,
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height_rew=self.max_height,
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healthy_reward=self.healthy_reward * 2,
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healthy=self.is_healthy,
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contact_dist=self.contact_dist or 0
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)
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return observation, reward, done, info
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def _get_obs(self):
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goal_dist = self.data.get_site_xpos('foot_site') - np.array([self.goal, 0, 0])
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return np.concatenate((super(HopperJumpEnv, self)._get_obs(), goal_dist.copy(), self.goal.copy()))
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def reset_model(self):
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super(HopperJumpEnv, self).reset_model()
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self.goal = self.np_random.uniform(0.3, 1.35, 1)[0]
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self.sim.model.body_pos[self.sim.model.body_name2id('goal_site_body')] = np.array([self.goal, 0, 0])
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self.max_height = 0
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self._steps = 0
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noise_low = -np.zeros(self.model.nq)
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noise_low[3] = -0.5
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noise_low[4] = -0.2
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noise_low[5] = 0
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noise_high = np.zeros(self.model.nq)
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noise_high[3] = 0
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noise_high[4] = 0
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noise_high[5] = 0.785
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qpos = (
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self.np_random.uniform(low=noise_low, high=noise_high, size=self.model.nq) +
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self.init_qpos
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)
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qvel = (
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# self.np_random.uniform(low=noise_low, high=noise_high, size=self.model.nv) +
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self.init_qvel
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)
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self.set_state(qpos, qvel)
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observation = self._get_obs()
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self.has_left_floor = False
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self.contact_with_floor = False
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self.init_floor_contact = False
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self.contact_dist = None
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return observation
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def _is_floor_foot_contact(self):
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floor_geom_id = self.model.geom_name2id('floor')
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foot_geom_id = self.model.geom_name2id('foot_geom')
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for i in range(self.data.ncon):
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contact = self.data.contact[i]
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collision = contact.geom1 == floor_geom_id and contact.geom2 == foot_geom_id
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collision_trans = contact.geom1 == foot_geom_id and contact.geom2 == floor_geom_id
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if collision or collision_trans:
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return True
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return False
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class HopperJumpStepEnv(HopperJumpEnv):
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def __init__(self,
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xml_file='hopper_jump.xml',
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forward_reward_weight=1.0,
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ctrl_cost_weight=1e-3,
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healthy_reward=1.0,
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height_weight=3,
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dist_weight=3,
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terminate_when_unhealthy=False,
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healthy_state_range=(-100.0, 100.0),
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healthy_z_range=(0.5, float('inf')),
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healthy_angle_range=(-float('inf'), float('inf')),
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reset_noise_scale=5e-3,
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exclude_current_positions_from_observation=False
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):
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self._height_weight = height_weight
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self._dist_weight = dist_weight
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super().__init__(xml_file, forward_reward_weight, ctrl_cost_weight, healthy_reward, terminate_when_unhealthy,
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healthy_state_range, healthy_z_range, healthy_angle_range, reset_noise_scale,
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exclude_current_positions_from_observation)
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def step(self, action):
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self._steps += 1
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self.do_simulation(action, self.frame_skip)
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height_after = self.get_body_com("torso")[2]
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site_pos_after = self.data.get_site_xpos('foot_site')
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self.max_height = max(height_after, self.max_height)
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ctrl_cost = self.control_cost(action)
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healthy_reward = self.healthy_reward
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height_reward = self._height_weight * height_after
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goal_dist = np.linalg.norm(site_pos_after - np.array([self.goal, 0, 0]))
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goal_dist_reward = -self._dist_weight * goal_dist
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dist_reward = self._forward_reward_weight * (goal_dist_reward + height_reward)
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rewards = dist_reward + healthy_reward
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costs = ctrl_cost
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done = False
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# This is only for logging the distance to goal when first having the contact
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has_floor_contact = self._is_floor_foot_contact() if not self.contact_with_floor else False
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if not self.init_floor_contact:
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self.init_floor_contact = has_floor_contact
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if self.init_floor_contact and not self.has_left_floor:
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self.has_left_floor = not has_floor_contact
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if not self.contact_with_floor and self.has_left_floor:
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self.contact_with_floor = has_floor_contact
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if self.contact_dist is None and self.contact_with_floor:
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self.contact_dist = goal_dist
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##############################################################
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observation = self._get_obs()
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reward = rewards - costs
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info = {
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'height': height_after,
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'x_pos': site_pos_after,
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'max_height': copy.copy(self.max_height),
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'goal': copy.copy(self.goal),
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'goal_dist': goal_dist,
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'height_rew': height_reward,
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'healthy_reward': healthy_reward,
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'healthy': copy.copy(self.is_healthy),
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'contact_dist': copy.copy(self.contact_dist) or 0
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}
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return observation, reward, done, info
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