true, but my point still holds: there is very little randomness in the way brain works. yes, it is present, but not as a primary device to deal with large sear

true, but my point still holds: there is very little randomness in the way brain works. yes, it is present, but not as a primary device to deal with large search space. we don't have a definitive answers on how the brain works, but I think, in this discussion, sparsity and hierarchy are those devices.