refactored multi agent proposal

src/ReinforcementLearningCore/src/policies/agent/base.jl

@@ -51,10 +51,6 @@
 
 @functor Agent (policy,)
 
-function Base.push!(agent::Agent, ::PreActStage, env::AbstractEnv)
-    push!(agent, state(env))
-end
-
 # !!! TODO: In async scenarios, parameters of the policy may still be updating
 # (partially), which will result to incorrect action. This should be addressed
 # in Oolong.jl with a wrapper
@@ -64,11 +60,8 @@
     action
 end
 
-# Multiagent Version
-function RLBase.plan!(agent::Agent{P,T,C}, env::E, p::Symbol) where {P,T,C,E<:AbstractEnv}
-    action = RLBase.plan!(agent.policy, env, p)
-    push!(agent.trajectory, agent.cache, action)
-    action
+function Base.push!(agent::Agent, ::PreActStage, env::AbstractEnv)
+    push!(agent, state(env))
 end
 
 function Base.push!(agent::Agent{P,T,C}, ::PostActStage, env::E) where {P,T,C,E<:AbstractEnv}
@@ -79,11 +72,26 @@
     RLBase.reset!(agent.cache)
 end
 
-function Base.push!(agent::Agent, ::PostExperimentStage, env::E, player::Symbol) where {E<:AbstractEnv}
-    RLBase.reset!(agent.cache)
-end
-
 function Base.push!(agent::Agent{P,T,C}, state::S) where {P,T,C,S}
     push!(agent.cache, state)
 end
 
+# Multiagent Version
+function RLBase.plan!(agent::Agent{P,T,C}, env::E, p::Symbol) where {P,T,C,E<:AbstractEnv}
+    action = RLBase.plan!(agent.policy, env, p)
+    push!(agent.trajectory, agent.cache, action)
+    action
+end
+
+# for simultaneous DynamicStyle environments, we have to define push! operations
+function Base.push!(agent::Agent, ::PreActStage, env::AbstractEnv, player::Symbol)
+    push!(agent, state(env, player))
+end
+
+function Base.push!(agent::Agent{P,T,C}, ::PostActStage, env::E, player::Symbol) where {P,T,C,E<:AbstractEnv}
+    push!(agent.cache, reward(env, player), is_terminated(env))
+end
+
+function Base.push!(agent::Agent, ::PostExperimentStage, env::E, player::Symbol) where {E<:AbstractEnv}
+    RLBase.reset!(agent.cache)
+end

src/ReinforcementLearningCore/src/policies/agent/multi_agent.jl

@@ -133,10 +133,12 @@
 
                 if check_stop(stop_condition, policy, env)
                     is_stop = true
-                    @timeit_debug timer "push!(policy) PreActStage"  push!(multiagent_policy, PreActStage(), env)
-                    @timeit_debug timer "optimise! PreActStage"      optimise!(multiagent_policy, PreActStage())
-                    @timeit_debug timer "push!(hook) PreActStage"    push!(multiagent_hook, PreActStage(), policy, env)
-                    @timeit_debug timer "plan!"                      RLBase.plan!(multiagent_policy, env)  # let the policy see the last observation
+                    if !is_terminated(env)
+                        @timeit_debug timer "push!(policy) PreActStage"  push!(multiagent_policy, PreActStage(), env)
+                        @timeit_debug timer "optimise! PreActStage"      optimise!(multiagent_policy, PreActStage())
+                        @timeit_debug timer "push!(hook) PreActStage"    push!(multiagent_hook, PreActStage(), policy, env)
+                        @timeit_debug timer "plan!"                      RLBase.plan!(multiagent_policy, env)  # let the policy see the last observation
+                    end
                     break
                 end
 
@@ -228,7 +230,7 @@
 end
 
 function RLBase.plan!(multiagent::MultiAgentPolicy, env::E) where {E<:AbstractEnv}
-    return (RLBase.plan!(multiagent[player], env, player) for player in players(env))
+    return NamedTuple(player => RLBase.plan!(multiagent[player], env, player) for player in players(env))
 end
 
 function RLBase.optimise!(multiagent::MultiAgentPolicy, stage::S) where {S<:AbstractStage}