If you were devious enough, you could be listening in on billions of phone conversations and messages and adding that to your data set.
This also makes me doubt that NSA hasn't already cracked this problem. Or that China won't eventually beat current western models since it will likely have way more data collected from its citizenry.
This also makes me doubt that NSA hasn't already cracked this problem. Or that China won't eventually beat current western models since it will likely have way more data collected from its citizenry.