Port TRPO, PPO, GAIL

scratch/etienne/trpo/ppo-intersimple-normobs.py

@@ -0,0 +1,61 @@
+from intersim.envs import IntersimpleLidarFlat
+from intersim.envs.intersimple import speed_reward
+import functools
+
+from core.ppo import ppo
+from core.value import Value
+from core.policy import Policy
+import torch.optim
+import numpy as np
+from gym.wrappers import TransformObservation
+
+obs_min = np.array([
+    [-1000, -1000, 0, -np.pi, -1e-1, 0.],
+    [0, -np.pi, -20, -20, -np.pi, -1e-1],
+    [0, -np.pi, -20, -20, -np.pi, -1e-1],
+    [0, -np.pi, -20, -20, -np.pi, -1e-1],
+    [0, -np.pi, -20, -20, -np.pi, -1e-1],
+    [0, -np.pi, -20, -20, -np.pi, -1e-1],
+]).reshape(-1)
+
+obs_max = np.array([
+    [1000, 1000, 20, np.pi, 1e-1, 0.],
+    [50, np.pi, 20, 20, np.pi, 1e-1],
+    [50, np.pi, 20, 20, np.pi, 1e-1],
+    [50, np.pi, 20, 20, np.pi, 1e-1],
+    [50, np.pi, 20, 20, np.pi, 1e-1],
+    [50, np.pi, 20, 20, np.pi, 1e-1],
+]).reshape(-1)
+
+envs = [TransformObservation(IntersimpleLidarFlat(
+    n_rays=5,
+    agent=51,
+    reward=functools.partial(
+        speed_reward,
+        collision_penalty=10
+    ),
+), lambda obs: (obs - obs_min) / (obs_max - obs_min + 1e-10)) for _ in range(30)]
+
+env_fn = lambda i: envs[i]
+policy = Policy(env_fn(0).action_space.shape[0])
+value = Value()
+pi_opt = torch.optim.Adam(policy.parameters(), lr=3e-4)
+v_opt = torch.optim.Adam(value.parameters(), lr=1e-3)
+
+value, policy = ppo(
+    env_fn=env_fn,
+    value=value,
+    policy=policy,
+    epochs=50,
+    rollout_episodes=30,
+    rollout_steps=100,
+    gamma=0.99,
+    gae_lambda=0.9,
+    clip_ratio=0.2,
+    pi_opt=pi_opt,
+    pi_iters=100,
+    v_opt=v_opt,
+    v_iters=1000,
+)
+
+torch.save(policy.state_dict(), 'ppo-intersimple.pt')