I'm not trying to DoSing a wolframalpha web services or their
asserts. but try this expression , click this link and say
to slove ( clusters ) ,
probably it will ever lasting and non terminating the calculation.
Why is that ? anyone curious , how it works ? I think the reason is
zig zag behaviour of the Gradient descent http://en.wikipedia.org/wiki/Gradient_descent
The sampling rate Delta(Err)/Delta(x) is too much higher so it's
what is you're ideas , please analyze that flaw of wolfram alpha.