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Grammar rule crp_sample_obs//6
 crp_sample_obs(+GEM:gem_param, +Classes:classes(A), +X:A, +PBase:prob, -A:action, -P:prob)// is det
 crp_sample_obs(+GEM:gem_param, +Classes:classes(A), +X:A, +PBase:prob, -A:action)// is det
Sample action appropriate for observation of value X. PBase is the probability of X from the base distribution. Action A is new or old(N) where N is the class index. crp_sample_obs//6 additionally returns the probability of the observation, equivalent to calling crp_prob with X BEFORE calling crp_sample_obs//5. Operates in random state DCG.