Reproducing result for Atari game

Hello,

I am currently trying to apply the IMPALA algorithm to Pong-v0 environment.

I first test my own V-Trace code to Cartpole-v0 and obtain maximum score(https://github.com/kimbring2/minecraft_ai/blob/master/CartPole-v0_IMPALA.ipynb).

The problem is that when I use the same code to Pong-v0(https://github.com/kimbring2/minecraft_ai/blob/master/Pong-v0_IMPALA.ipynb), I can not obtain the score of mentioned at IMPALA paper yet.

It usually take the 1 hour to reach maximum score when I use normal A2C algorithm.

I assume I should change the parameter. Can you give me some hint about that?

Thank you