Hmmm, I see no reason why that would eat up memory. I just tried it out on my own system (numpy 1.6.1, CentOS 6, python 2.7.1), and had no issues, Memory usage stayed flat for the 10 seconds it took to go through the loop. Note, I am not using ATLAS or BLAS, so maybe the issue lies there? (i don't know if numpy defers the dot-product over to ATLAS or BLAS if they are available)
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