DQN why train iterate for 10 times

[KYY]

https://github.com/seungeunrho/minimalRL/blob/master/dqn.py

minimalRL/dqn.py

Line 63 in 7597b9a

 def train(q, q_target, memory, optimizer): 

I am wondering why the train method is internally looping 10 times? Shouldn't the policy network train per action?