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Separate policy and value net

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This commit is contained in:
Antonin RAFFIN 2019-09-21 18:12:06 +02:00
parent 2469ff3859
commit 70e1d673a9
1 changed files with 28 additions and 12 deletions
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40
torchy_baselines/ppo/policies.py
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@ -27,6 +27,7 @@ class PPOPolicy(BasePolicy):
'activation_fn': self.activation_fn
}
self.shared_net = None
self.pi_net, self.vf_net = None, None
self._build(learning_rate)
@staticmethod
@ -36,16 +37,24 @@ class PPOPolicy(BasePolicy):
module.bias.data.fill_(0.0)
def _build(self, learning_rate):
# TODO: support non-shared network
shared_net = create_mlp(self.state_dim, output_dim=-1, net_arch=self.net_arch, activation_fn=self.activation_fn)
self.shared_net = nn.Sequential(*shared_net).to(self.device)
# TODO: support shared network
# shared_net = create_mlp(self.state_dim, output_dim=-1, net_arch=self.net_arch, activation_fn=self.activation_fn)
# self.shared_net = nn.Sequential(*shared_net).to(self.device)
pi_net = create_mlp(self.state_dim, output_dim=-1, net_arch=self.net_arch, activation_fn=self.activation_fn)
self.pi_net = nn.Sequential(*pi_net).to(self.device)
vf_net = create_mlp(self.state_dim, output_dim=-1, net_arch=self.net_arch, activation_fn=self.activation_fn)
self.vf_net = nn.Sequential(*vf_net).to(self.device)
self.actor_net = nn.Linear(self.net_arch[-1], self.action_dim)
self.value_net = nn.Linear(self.net_arch[-1], 1)
self.log_std = nn.Parameter(th.zeros(self.action_dim))
# Init weights: use orthogonal initialization
for module in [self.shared_net, self.actor_net, self.value_net]:
for module in [self.pi_net, self.vf_net, self.actor_net, self.value_net]:
# Values from stable-baselines check why
gain = {
self.pi_net: np.sqrt(2),
self.vf_net: np.sqrt(2),
self.shared_net: np.sqrt(2),
self.actor_net: 0.01,
self.value_net: 1
@ -56,12 +65,19 @@ class PPOPolicy(BasePolicy):
def forward(self, state, deterministic=False):
state = th.FloatTensor(state).to(self.device)
latent = self.shared_net(state)
value = self.value_net(latent)
action, action_distribution = self._get_action_dist_from_latent(latent, deterministic=deterministic)
latent_pi, latent_vf = self._get_latent(state)
value = self.value_net(latent_vf)
action, action_distribution = self._get_action_dist_from_latent(latent_pi, deterministic=deterministic)
log_prob = self._get_log_prob(action_distribution, action)
return action, value, log_prob
def _get_latent(self, state):
if self.shared_net is not None:
latent = self.shared_net(state)
return latent, latent
else:
return self.pi_net(state), self.vf_net(state)
def _get_action_dist_from_latent(self, latent, deterministic=False):
mean_actions = self.actor_net(latent)
action_std = th.ones_like(mean_actions) * self.log_std.exp()
@ -83,15 +99,15 @@ class PPOPolicy(BasePolicy):
return log_prob
def actor_forward(self, state, deterministic=False):
latent = self.shared_net(state)
action, _ = self._get_action_dist_from_latent(latent, deterministic=deterministic)
latent_pi, _ = self._get_latent(state)
action, _ = self._get_action_dist_from_latent(latent_pi, deterministic=deterministic)
return action.detach().cpu().numpy()
def get_policy_stats(self, state, action):
latent = self.shared_net(state)
_, action_distribution = self._get_action_dist_from_latent(latent)
latent_pi, latent_vf = self._get_latent(state)
_, action_distribution = self._get_action_dist_from_latent(latent_pi)
log_prob = self._get_log_prob(action_distribution, action)
value = self.value_net(latent)
value = self.value_net(latent_vf)
return value, log_prob, action_distribution.entropy()
def value_forward(self):