As discussed on the corresponding Github issue[1], this is not going to be functionality that we add onto `choice()` nor is it likely something that we will add as a separate `Generator` method. The desired computation is straightforward to do by composing existing functionality.
[1] https://github.com/numpy/numpy/issues/22082 On Thu, Aug 4, 2022 at 2:07 PM Rodo-Singh <adityasinghd...@gmail.com> wrote: > Proposed new feature or change: > Objective: Sample elements from the given iterator (a list, a numpy array, > etc.) based upon pre-defined probabilities associated with each element > which may not sums upto 1. > > Overview > * In the numpy.random.choice function the cases where we're explicitly > providing the list of probabilistic values for an input sample, the > requirement expects the sum of the whole list to be 1. This makes sense > when all the elements are possible observation for a single random variable > whose pmf(probability mass function) is nothing but the p list. > * But when every element in that list can be regarded as observation of > separate independent Bernoulli r.v. (random variable), then the problem > falls into the category of multi-label. Intuitively speaking, for each > element in the list or array given to us, we'll toss a coin (may be biased > or unbiased) ~B(p) (i.e., follows Bernoulli with p as success probability > for head). > * The output array or list would probably be a proper subset or can be a > full list or can be an empty one. > * Plus, here the argument size should automatically get shut down as we > just want which all elements got selected into the output list after n coin > tossess (where len(list) = n). Also it may happen that each element is > independent as argued above, but the sum(p) = 1. Then we can probably put > an extra argument independence = True or independence = False. > _______________________________________________ > NumPy-Discussion mailing list -- numpy-discussion@python.org > To unsubscribe send an email to numpy-discussion-le...@python.org > https://mail.python.org/mailman3/lists/numpy-discussion.python.org/ > Member address: robert.k...@gmail.com > -- Robert Kern
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