more fixes in Gym Ant to make reward the same as Roboschool,

apparently feet_collision_cost is not properly updated in Roboschool,
for now, disable it in pybullet too: see https://github.com/openai/roboschool/issues/63

examples/pybullet/gym/pybullet_envs/env_bases.py

@@ -21,20 +21,18 @@ class MJCFBaseBulletEnv(gym.Env):
 		self.camera = Camera()
 		self.isRender = render
 		self.robot = robot
-
 		self._seed()
 
 		self.action_space = robot.action_space
 		self.observation_space = robot.observation_space
-
+	def configure(self, args):
+		self.robot.args = args
 	def _seed(self, seed=None):
 		self.np_random, seed = gym.utils.seeding.np_random(seed)
 		self.robot.np_random = self.np_random # use the same np_randomizer for robot as for env
 		return [seed]
 
 	def _reset(self):
-		print("self.isRender=")
-		print(self.isRender)
 		if (self.physicsClientId<0):
 			if (self.isRender):
 				self.physicsClientId = p.connect(p.GUI)

examples/pybullet/gym/pybullet_envs/examples/enjoy_TF_AntBulletEnv_v0_2017may.py

@@ -51,6 +51,8 @@ def main():
             time.sleep(0.01)
             a = pi.act(obs)
             obs, r, done, _ = env.step(a)
+            #print("reward")
+            #print(r)
             score += r
             frame += 1
             distance=5

examples/pybullet/gym/pybullet_envs/gym_locomotion_envs.py

@@ -15,7 +15,7 @@ class WalkerBaseBulletEnv(MJCFBaseBulletEnv):
 		self.walk_target_y = 0
 
 	def create_single_player_scene(self):
-		self.stadium_scene = SinglePlayerStadiumScene(gravity=9.8, timestep=0.0165, frame_skip=4)
+		self.stadium_scene = SinglePlayerStadiumScene(gravity=9.8, timestep=0.0165/4, frame_skip=4)
 		return self.stadium_scene
 
 	def _reset(self):
@@ -63,15 +63,32 @@ class WalkerBaseBulletEnv(MJCFBaseBulletEnv):
 		feet_collision_cost = 0.0
 		for i,f in enumerate(self.robot.feet): # TODO: Maybe calculating feet contacts could be done within the robot code
 			contact_ids = set((x[2], x[4]) for x in f.contact_list())
-			#print("CONTACT OF '%s' WITH %s" % (f.name, ",".join(contact_names)) )
+			#print("CONTACT OF '%d' WITH %d" % (contact_ids, ",".join(contact_names)) )
-			self.robot.feet_contact[i] = 1.0 if (self.ground_ids & contact_ids) else 0.0
+			if (self.ground_ids & contact_ids):
-			if contact_ids - self.ground_ids:
+				#disable feet_collision_cost update, for compatibility with Roboschool
-				feet_collision_cost += self.foot_collision_cost
+                        	#see Issue 63: https://github.com/openai/roboschool/issues/63
+				#feet_collision_cost += self.foot_collision_cost
+				self.robot.feet_contact[i] = 1.0
+			else:
+				self.robot.feet_contact[i] = 0.0
+
 
 		electricity_cost  = self.electricity_cost  * float(np.abs(a*self.robot.joint_speeds).mean())  # let's assume we have DC motor with controller, and reverse current braking
 		electricity_cost += self.stall_torque_cost * float(np.square(a).mean())
 
 		joints_at_limit_cost = float(self.joints_at_limit_cost * self.robot.joints_at_limit)
+		debugmode=0
+		if(debugmode):
+			print("alive=")
+			print(alive)
+			print("progress")
+			print(progress)
+			print("electricity_cost")
+			print(electricity_cost)
+			print("joints_at_limit_cost")
+			print(joints_at_limit_cost)
+			print("feet_collision_cost")
+			print(feet_collision_cost)
 
 		self.rewards = [
 			alive,
@@ -80,8 +97,14 @@ class WalkerBaseBulletEnv(MJCFBaseBulletEnv):
 			joints_at_limit_cost,
 			feet_collision_cost
 			]
-
+		if (debugmode):
+			print("rewards=")
+			print(self.rewards)
+			print("sum rewards")
+			print(sum(self.rewards))
 		self.HUD(state, a, done)
+		self.reward += sum(self.rewards)
+
 		return state, sum(self.rewards), bool(done), {}
 
 	def camera_adjust(self):

examples/pybullet/gym/pybullet_envs/robot_locomotors.py

@@ -62,6 +62,16 @@ class WalkerBase(MJCFBasedRobot):
 	def calc_potential(self):
 		# progress in potential field is speed*dt, typical speed is about 2-3 meter per second, this potential will change 2-3 per frame (not per second),
 		# all rewards have rew/frame units and close to 1.0
+		debugmode=0
+		if (debugmode):
+			print("calc_potential: self.walk_target_dist")
+			print(self.walk_target_dist)
+			print("self.scene.dt")
+			print(self.scene.dt)
+			print("self.scene.frame_skip")
+			print(self.scene.frame_skip)
+			print("self.scene.timestep")
+			print(self.scene.timestep)
 		return - self.walk_target_dist / self.scene.dt
 
 

examples/pybullet/gym/pybullet_envs/scene_abstract.py

@@ -12,8 +12,9 @@ class Scene:
         self.np_random, seed = gym.utils.seeding.np_random(None)
         self.timestep = timestep
         self.frame_skip = frame_skip
+
         self.dt = self.timestep * self.frame_skip
-        self.cpp_world = World(gravity, timestep)
+        self.cpp_world = World(gravity, timestep, frame_skip)
         #self.cpp_world.set_glsl_path(os.path.join(os.path.dirname(__file__), "cpp-household/glsl"))
 
         #self.big_caption = self.cpp_world.test_window_big_caption  # that's a function you can call
@@ -60,16 +61,17 @@ class SingleRobotEmptyScene(Scene):
 
 class World:
 
-	def __init__(self, gravity, timestep):
+	def __init__(self, gravity, timestep, frame_skip):
 		self.gravity = gravity
 		self.timestep = timestep
+		self.frame_skip = frame_skip
 		self.clean_everything()
 
 	def clean_everything(self):
 		p.resetSimulation()
 		p.setGravity(0, 0, -self.gravity)
 		p.setDefaultContactERP(0.9)
-		p.setPhysicsEngineParameter(fixedTimeStep=self.timestep, numSolverIterations=5, numSubSteps=4)
+		p.setPhysicsEngineParameter(fixedTimeStep=self.timestep*self.frame_skip, numSolverIterations=5, numSubSteps=self.frame_skip)
 
 	def step(self, frame_skip):
 		p.stepSimulation()