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--[[
Copyright (c) 2019, Vsevolod Stakhov <vsevolod@highsecure.ru>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
-- This file contains functions to simplify bayes classifier auto-learning
local exports = {}
exports.can_learn = function(task, is_spam, is_unlearn)
local learn_type = task:get_request_header('Learn-Type')
if not (learn_type and tostring(learn_type) == 'bulk') then
local prob = task:get_mempool():get_variable('bayes_prob', 'double')
if prob then
local in_class = false
local cl
if is_spam then
cl = 'spam'
in_class = prob >= 0.95
else
cl = 'ham'
in_class = prob <= 0.05
end
if in_class then
return false,string.format(
'already in class %s; probability %.2f%%',
cl, math.abs((prob - 0.5) * 200.0))
end
end
end
return true
end
return exports
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