@startuml serial_learner
header Serial Pipeline
title Serial Learner

|#99CCCC|serial_controller|
|#CCCCFF|policy|
|#99CCFF|learner|

|#99CCCC|serial_controller|
start
:init learner, \nset its learn_mode policy;
|#99CCFF|learner|
:get data from buffer;
|#CCCCFF|policy|
:data forward;
:loss backward;
:optimizer step, gradient update;
|#99CCFF|learner|
:update train info(loss, value) and log;
:update learn info(iteration, priority);
stop
@enduml