Humans Consulting HCH (HCH) is a recursive acronym describing a setup where humans can consult simulations of themselves to help answer questions. It is a concept used in discussion of the iterated amplification proposal to solve the alignment problem.
It was first described by Paul Christiano in his post Humans Consulting HCH:
Consider a human Hugh who has access to a question-answering machine. Suppose the machine answers question Q by perfectly imitating how Hugh would answer question Q, if Hugh had access to the question-answering machine.
That is, Hugh is able to consult a copy of Hugh, who is able to consult a copy of Hugh, who is able to consult a copy of Hugh…
Let’s call this process HCH, for “Humans Consulting HCH.”
The current description feels like it’s cut off at the middle. My next is question after reading the quote is “Why is this useful?”