On Tue, May 17, 2011 at 6:47 PM, Wieland Brendel <wielandbrendel@gmx.net>wrote:
Hello, I am encountering a very strange behaviour of einsum on my machine. I tracked the problem down to the following test code:
from numpy import *
T = random.random((3,10,10)) W = random.random((3,10,7,275))
print all(einsum('ij...,j...->i...',T[0],W[0]) + einsum('ij...,j...->i...',T[1],W[1]) + einsum('ij...,j...->i...',T[2],W[2]) - einsum('pij,pjts->its',T,W)< 1e-10) print sum(abs(einsum('ij...,j...->i...',T[0],W[0]) + einsum('ij...,j...->i...',T[1],W[1]) + einsum('ij...,j...->i...',T[2],W[2]) - einsum('pij,pjts->its',T,W)))
On my machine the equality is not fulfilled. However, this depends, strange enough, on the dimensions of W: if the last dimension e.g. is 500 instead of 275, things work again and the equality is fulfilled.
The equality being that the expression should be ~0? I see the problem when the last index is in the range 235 - 390.
Are you encountering similar problems or is this just my machine/installation?
Out of curiosity, which machine/OS are you using? I'm on 64 bit fedora 14, AMD 940. Chuck