Eh, before saying that, go ahead and read some recent research.  <a href="http:&#x2F;&#x2F;www.cs.toronto.edu&#x2F;~rgrosse&#x2F;phd-thesis.pdf" rel="nofollow">http:&#x2F;&#x2F;www.cs.toronto.edu&#x2F;~rgrosse&#x2F;phd-thesis.pdf</a>, for example.