doesn't know or not because you are replacing the null values into the original filter with some kind of mean or median or something like that and you need to help your neural network by this additional information so back to the outliers so when you are doing the removal of the outliers from your training set you know that later on you will do some feature engineering and you can you can ask yourself well if I remove those outliers now maybe filter engineering may help me later to predict those outliers color correctly so how