Divide by zero

[pedronahum]

Hi, First and foremost, thanks for sharing the code. This is greatly appreciated.

Currently testing ARS in other learning environments and found that for very difficult environments the users of the code might face a divide by zero error, particularly at early stages of the learning process (ie, zero reward in all the initial rollouts).

# normalize rewards by their standard deviation
rollout_rewards /= np.std(rollout_rewards)

Thanks,

[hari-sikchi]

I experienced this kind of difficulties in all sparse reward setting. Is ARS a good way to go for these optimization landscapes?

[ashutoshtiwari13]

Can we use a .clip(min=1e-2) to avoid that ?

[pedronahum]

In my case, adding 1e-8 to the divisor made the trick...

[ashutoshtiwari13]

yeah @pedronahum , that would do it too!