Random indices in search.py

[YuhuaBillChen]

Hi @jack-willturner , I came across the code in search.py and noticed that the sample architecture indices are generated from np.random.randint, which will result in duplicated numbers.

It should not be a big issue when the sampling size is relatively small. However, I think it is better to replace it with np.random.choice to avoid evaluating the same network twice.

Thanks, Bill

[jack-willturner]

Good spot, thank you! I'll re-run the experiments with np.random.choice instead and update the code/results soon.