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annotate mod_report_affiliations/traits.lib.lua @ 6513:5fb466693e85

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mod_storage_xmlarchive: Ensure list index files are removed using os.remove() on the list files leaves the new index files behind since util.datamanager does not know they are removed. Thanks Link Mauve
author Kim Alvefur <zash@zash.se>
date Tue, 07 Apr 2026 21:10:54 +0200
parents e905ef16efb7
children
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1 local known_traits = {};
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2
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3 local function trait_added(event)
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4 local trait = event.item;
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5 local name = trait.name;
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6 if known_traits[name] then return; end
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7
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8 known_traits[name] = trait.probabilities;
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9 end
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10
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11 local function trait_removed(event)
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12 local trait = event.item;
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13 known_traits[trait.name] = nil;
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14 end
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16 module:handle_items("account-trait", trait_added, trait_removed);
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17
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18 local function bayes_probability(prior, prob_given_true, prob_given_false)
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19 local numerator = prob_given_true * prior;
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20 local denominator = numerator + prob_given_false * (1 - prior);
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21 return numerator / denominator;
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22 end
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23
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24 local function prob_is_bad(traits, prior)
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25 prior = prior or 0.50;
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26
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27 for trait, state in pairs(traits) do
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28 local probabilities = known_traits[trait];
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29 if probabilities then
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30 if state then
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31 prior = bayes_probability(
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32 prior,
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33 probabilities.prob_bad_true,
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34 probabilities.prob_bad_false
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35 );
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36 else
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37 prior = bayes_probability(
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38 prior,
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39 1 - probabilities.prob_bad_true,
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40 1 - probabilities.prob_bad_false
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41 );
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42 end
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43 end
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44 end
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45
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46 return prior;
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47 end
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48
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49 local function get_probability_bad(username, prior)
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50 local user_traits = {};
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51 module:fire_event("get-account-traits", { username = username, host = module.host, traits = user_traits });
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52 local result = prob_is_bad(user_traits, prior);
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53 return result;
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54 end
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55
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56 return {
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57 get_probability_bad = get_probability_bad;
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58 };