Investigate hashed values corresponding to null.

atkm / avazu-ctr

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Investigate hashed values corresponding to null. #2

Open atkm opened 5 years ago

atkm commented 5 years ago

See https://www.kaggle.com/c/avazu-ctr-prediction/discussion/10852 and https://www.kaggle.com/c/avazu-ctr-prediction/discussion/10819

atkm commented 5 years ago

device_id: a99f214a site_id: 85f751fd in test site_domain: c4e18dd6 site_category: 50e219e0 app_id: ecad2386 app_domain: 7801e8d9 app_cateogry: 07d7df22 C23: -1

1fbe01fe is the most frequent site_id value in the training set, but this may not be a null value, as it does not satisfy properties that is expected from a null value, which are:

site_id = null implies site_domain = null
site_id and app_id are mutually exclusive.