fact: Definition type_choice_f (A : finType) n (f : {ffun A -> 'I_n.+1}) : option (P_ n ( A )).
imports: mathcomp(all_ssreflect ssralg ssrnum perm) mathcomp(matrix) mathcomp(Rstruct) Reals ssrR Reals_ext realType_ext ssr_ext ssralg_ext logb fdist proba entropy num_occ channel_code channel typ_seq