code: def store_transition(self, frame, action, reward, done, extra_info=None):
          
          self.current_idx = (self.current_idx + 1) % self.buffer_capacity
  
          self.state_buffer[self.current_idx] = frame
          self.action_buffer[self.current_idx] = action
          self.reward_buffer[self.current_idx] = reward
          self.dones_buffer[self.current_idx] = done
  
          for name in self.extra_data:
              self.extra_data[name][self.current_idx] = extra_info[name]
  
          if self.current_size < self.buffer_capacity:
              self.current_size += 1
  
          return self.current_idx
docs: Store given transition in the backend