Thanks! So machine differences in their FP units drives the entropy, and the code doesn't handle that when picking eigenvectors?

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saagarjha 10 months ago | parent | next [-]

It doesn't have to be their FP units; it could be that they run the operations in different orders, or that some different modes were set. I don't think the blog post goes into detail as to why but it does explain how this "cascades" into very different results coming out of the actual operation being performed.

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pfortuny 10 months ago | parent | prev [-]

Implementations of IEEE-754 can differ between machines, and the order of operations in a library/compiled function can also be different. It is not entropy, it is the nature of floating-point arithmetic.

	▲	coolcase 10 months ago \| parent [-]
		Thanks. So sounds like the same machine should run the same calculations and get the same results each time, but differences may appear between machines.