what does one mean by numerical integration is too expensive?

by discretetimeisnice   Last Updated October 25, 2016 09:08 AM

I am reading about Bayesian inference and I came across the phrase "numerical integration of the marginal likelihood is too expensive"

I do not have a background in mathematics and I was wondering what exactly does expensive mean here? Is it just in terms of computation power or is there something more. Thanks!

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