evaluating and sampling from pdfs

I spoke with MJ Vakili today about how to turn his prior over galaxy images into a probabilistic weak lensing measurement system. Any time we write down a probabilistic model, we need to be able to evaluate the probability of some set of parameters given data, or some set of data given parameters, and we also need to be able to sample from it: We need to be able to generate fair samples of artificial data given parameters, and generate fair samples of parameters given data. Vakili is assigned with the task of making both kinds of operations first correct and second fast; the weak lensing community won't care that we are more righteous if we aren't practicable.

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