Before revision:  Interestingly our analysis suggests that data corrupted by adding noise to causal features will degrade out-of-domain performance, while noise added to non-causal features may make models more robust out-of-domain .
After revision:  Interestingly our analysis suggests that data corrupted by adding noise to causal features will degrade out-of-domain performance, adding noise to non-causal features may make models more robust out-of-domain .