class WindySlope(gym.Env):
def __init__(self,
model,
mode,
hertz=25,
should_render=True,
should_screenshot=False):
self.hertz = hertz
self.steps = 0
self.should_render = should_render
self.should_screenshot = should_screenshot
self.nsubsteps = int(MAX_TIME / model.opt.timestep / 100)
self.viewer = None
self.model = model
self.mode = mode
self.enabled = True
self.metadata = {'render.modes': 'rgb_array'}
self.should_record = False
def close(self):
pass
@property
def observation_space(self):
return Box(low=-np.inf, high=np.inf, shape=(18, ))
@property
def action_space(self):
return Box(low=-np.inf, high=np.inf, shape=(0, ))
@property
def model(self):
return self._model
@model.setter
def model(self, model):
self._model = model
self.sim = MjSim(model)
self.data = self.sim.data
if self.should_render:
if self.viewer:
self.viewer.sim = sim
return
self.viewer = MjViewer(self.sim)
self.viewer.cam.azimuth = 45
self.viewer.cam.elevation = -20
self.viewer.cam.distance = 25
self.viewer.cam.lookat[:] = [0, 0, -2]
self.viewer.scn.flags[3] = 0
def reset(self):
self.sim.reset()
self.steps = 0
self.sim.forward()
obs = self.get_observations(self.model, self.data)
return obs
def get_observations(self, model, data):
self.sim.forward()
obs = []
name = 'box'
pos = data.get_body_xpos(name)
xmat = data.get_body_xmat(name).reshape(-1)
velp = data.get_body_xvelp(name)
velr = data.get_body_xvelr(name)
for x in [pos, xmat, velp, velr]:
obs.extend(x.copy())
obs = np.array(obs, dtype=np.float32)
return obs
def screenshot(self, image_path):
self.viewer.hide_overlay = True
self.viewer.render()
width, height = 2560, 1440
#width, height = 1,1
img = self.viewer.read_pixels(width, height, depth=False)
# original image is upside-down, so flip it
img = img[::-1, :, :]
imageio.imwrite(image_path, img)
def step(self, action):
nsubsteps = self.nsubsteps
for _ in range(nsubsteps):
self.sim.step()
self.render()
self.steps += 1
return self.get_observations(self.model,
self.data), 1, self.steps == 100, {}
def render(self, mode=None):
if self.should_render:
self.viewer._overlay.clear()
def nothing():
return
self.viewer._create_full_overlay = nothing
wind = model.opt.wind[0]
self.viewer.add_overlay(1, "Wind", "{:.2f}".format(wind))
self.viewer.render()
if self.should_record:
width, height = 2560, 1440
img = self.viewer.read_pixels(width, height, depth=False)
# original image is upside-down, so flip it
img = img[::-1, :, :]
return img
def euler2quat(self, euler):
euler = np.asarray(euler, dtype=np.float64)
assert euler.shape[-1] == 3, "Invalid shape euler {}".format(euler)
ai, aj, ak = euler[..., 2] / 2, -euler[..., 1] / 2, euler[..., 0] / 2
si, sj, sk = np.sin(ai), np.sin(aj), np.sin(ak)
ci, cj, ck = np.cos(ai), np.cos(aj), np.cos(ak)
cc, cs = ci * ck, ci * sk
sc, ss = si * ck, si * sk
quat = np.empty(euler.shape[:-1] + (4, ), dtype=np.float64)
quat[..., 0] = cj * cc + sj * ss
quat[..., 3] = cj * sc - sj * cs
quat[..., 2] = -(cj * ss + sj * cc)
quat[..., 1] = cj * cs - sj * sc
return quat
def degrees2radians(self, degrees):
return degrees * np.pi / 180
class RobotEnv(object):
def __init__(self):
self.model = load_model_from_path(XML_PATH)
self.sim = MjSim(self.model)
self.viewer = MjViewer(self.sim)
# finger instances
self.front_finger = RollerFinger(idx=0,
name='front',
pos_base=np.array([0, 0.048, 0.085]),
base_normal=np.array([0., -1., 0.]),
base_horizontal=np.array([1., 0.,
0.]))
self.left_finger = RollerFinger(
idx=1,
name='left',
pos_base=np.array([-0.04157, -0.024, 0.085]),
base_normal=np.array([0.8660, 0.5, 0.]),
base_horizontal=np.array([-0.5, 0.8660, 0.]))
self.right_finger = RollerFinger(
idx=2,
name='right',
pos_base=np.array([0.04157, -0.024, 0.085]),
base_normal=np.array([-0.8660, 0.5, 0.]),
base_horizontal=np.array([-0.5, -0.8660, 0.]))
self.r_fingers = [
self.front_finger, self.left_finger, self.right_finger
]
# object target orientation in angle-axis representation
self.axis = normalize_vec(np.array([0., 1., 1.]))
self.angle = deg_to_rad(90)
self.init_box_pos = np.array([0.0, 0.0, 0.2]) # obj initial pos
self.target_box_pos = np.array([0.0, 0.0, 0.2]) # obj target pos
self.max_step = 1500
self.termination = False
self.success = False
self.timestep = 0
self.k_vw = 0.5
self.k_vv = 0.3
self.reset()
def reset(self, target_axis=np.array([0., 1., 1.]), target_angle=90):
self.sim.reset()
# Reset finger positions
for fg in self.r_fingers:
self.sim.data.qpos[fg.idx * 3] = fg.init_base_angle # base angles
self.sim.data.qpos[fg.idx * 3 + 1] = 0 # pivot angles
my_map = [0, 3, 6, 1, 4, 7, 2, 5,
8] # qpos and ctrl have different joint orders (see xml)
for ii in range(9):
self.sim.data.ctrl[ii] = self.sim.data.qpos[my_map[ii]]
self.sim.step()
self.termination = False
self.success = False
self.timestep = 0
# reset target
if target_axis is not None:
self.axis = normalize_vec(target_axis)
if target_angle is not None:
self.angle = deg_to_rad(target_angle)
self.quat_target = np.array([
np.cos(self.angle / 2), self.axis[0] * np.sin(self.angle / 2),
self.axis[1] * np.sin(self.angle / 2),
self.axis[2] * np.sin(self.angle / 2)
])
self.curr = self.sim.data.sensordata[
-7:] # quat_to_rot(self.sim.data.sensordata[-4:])
self.rot_matrix_target = R.from_quat(quat_to_quat(
self.quat_target)).as_matrix()
self.test_min_err = 100
self.session_name = str(self.axis) + ', ' + str(rad_to_deg(self.angle))
return self.sim.data.sensordata
def get_expert_action(self):
# Sensor data
curr_data = self.sim.data.sensordata
self.cube_pos = curr_data[-7:-4] # obj position
self.cube_orientation = curr_data[-4:] # obj orientation
# compute each finger
for fg in self.r_fingers:
fg.base_rad = self.sim.data.qpos[fg.idx * 3]
fg.q_pivot_prev = self.sim.data.qpos[fg.idx * 3 + 1]
fg.q_pivot, fg.dq_roller = compute_pivot_and_roller(
k_vw=self.k_vw,
k_vv=self.k_vv,
base_angle=fg.base_rad,
pos_obj_curr=self.cube_pos,
pos_obj_target=self.target_box_pos,
ori_obj_curr=self.cube_orientation,
ori_obj_target=self.quat_target,
r_roller=fg.roller_radius,
finger_length=fg.dist_pivot_to_base,
pos_base=fg.pos_base,
base_axis=fg.base_horizontal,
finger_normal=fg.base_normal)
dq_pivot = np.clip(fg.q_pivot - fg.q_pivot_prev, -fg.q_pivot_limit,
fg.q_pivot_limit)
fg.q_pivot = fg.q_pivot_prev + dq_pivot
self.sim.data.ctrl[fg.idx] = -fg.init_base_angle
self.sim.data.ctrl[3 + fg.idx] = fg.pivot_gear_ratio * fg.q_pivot
self.sim.data.ctrl[6 + fg.idx] += fg.dq_roller
action = np.copy(self.sim.data.ctrl)
return action
def step(self, action):
for i in range(len(action)):
self.sim.data.ctrl[i] = action[i]
self.viewer.add_overlay(const.GRID_TOPRIGHT, " ", self.session_name)
self.viewer.render()
self.sim.step()
self.timestep += 1
obs = self.sim.data.sensordata
curr = obs[-7:] # object pose and orientation
err_curr_rot = get_quat_error(curr[3:], self.quat_target)
err_curr_pos = get_pos_error(curr[:3], self.target_box_pos)
err_curr = SCALE_ERROR_ROT * err_curr_rot + SCALE_ERROR_POS * err_curr_pos
self.test_min_err = min(self.test_min_err, err_curr_rot)
if err_curr < 15:
self.termination = True
self.success = True
else:
if self.timestep > self.max_step or err_curr_pos > 0.05:
self.termination = True
self.success = False
#if self.termination:
# print("target axis",self.axis,"success",self.success,"min_error",self.test_min_err)
return obs, self.termination, self.success
