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local Util = nerv.class("nerv.LMUtil")
local mysplit = function(inputstr, sep)
if sep == nil then
sep = "%s"
end
local t={} ; i=1
for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
t[i] = str
i = i + 1
end
return t
end
--function rounds a number to the given number of decimal places.
function Util.round(num, idp)
local mult = 10^(idp or 0)
return math.floor(num * mult + 0.5) / mult
end
--fh: file_handle
--Returns: a list of tokens(string) in the line, if there is no "</s>" at the end, the function will at it, if nothing to read, returns nil
function Util.read_line(fh)
local l_str, list
repeat
l_str = fh:read("*line")
if (l_str == nil) then return nil end
list = mysplit(l_str)
until #list >= 1
return list
end
--list: table, list of string(word)
--vocab: nerv.LMVocab
--ty: nerv.CuMatrix
--Returns: nerv.CuMatrixFloat
--Create a matrix of type 'ty', size #list * vocab:size(). null_word will become a zero vector.
function Util.create_onehot(list, vocab, ty)
local m = ty(#list, vocab:size())
m:fill(0)
for i = 1, #list, 1 do
--index in matrix starts at 0
if (list[i] ~= vocab.null_token) then
m[i - 1][vocab:get_word_str(list[i]).id - 1] = 1
end
end
return m
end
--m: matrix
--list: table, list of string(word)
--vocab: nerv.LMVocab
--Returns: nerv.CuMatrixFloat
--Set the matrix, whose size should be size #list * vocab:size() to be one_hot according to the list. null_word will become a zero vector.
function Util.set_onehot(m, list, vocab)
if (m:nrow() ~= #list or m:ncol() ~= vocab:size()) then
nerv.error("size of matrix mismatch with list and vocab")
end
m:fill(0)
for i = 1, #list, 1 do
--index in matrix starts at 0
if (list[i] ~= vocab.null_token) then
m[i - 1][vocab:get_word_str(list[i]).id - 1] = 1
end
end
return m
end
--m: matrix
--list: table, list of string(word)
--vocab: nerv.LMVocab
--Returns: nerv.MMatrixInt
--Set the matrix to be ids of the words, id starting at 1, not 0
function Util.set_id(m, list, vocab)
if (m:nrow() ~= #list or m:ncol() ~= 1) then
nerv.error("nrow of matrix mismatch with list or its col not one")
end
for i = 1, #list, 1 do
--index in matrix starts at 0
if (list[i] ~= vocab.null_token) then
m[i - 1][0] = vocab:get_word_str(list[i]).id
else
m[i - 1][0] = 0
end
end
return m
end
function Util.wait(sec)
local start = os.time()
repeat until os.time() > start + sec
end
local Result = nerv.class("nerv.LMResult")
--global_conf: table
--vocab:nerv.LMVocab
function Result:__init(global_conf, vocab)
self.gconf = global_conf
self.vocab = vocab
end
--cla:string
--Initialize status of class cla
function Result:init(cla)
self[cla] = {logp_all = 0, logp_unk = 0, cn_w = 0, cn_unk = 0, cn_sen = 0}
end
--cla:string
--w:string
--prob:float, the probability
function Result:add(cla, w, prob, log10ed)
local lp
if log10ed == true then
lp = prob
else
lp = math.log10(prob)
end
self[cla].logp_all = self[cla].logp_all + lp
if (self.vocab:is_unk_str(w)) then
self[cla].logp_unk = self[cla].logp_unk + lp
self[cla].cn_unk = self[cla].cn_unk + 1
end
if (w == self.vocab.sen_end_token) then
self[cla].cn_sen = self[cla].cn_sen + 1
else
self[cla].cn_w = self[cla].cn_w + 1
end
end
function Result:ppl_net(cla)
local c = self[cla]
return math.pow(10, -(c.logp_all - c.logp_unk) / (c.cn_w - c.cn_unk + c.cn_sen))
end
function Result:ppl_all(cla)
local c = self[cla]
return math.pow(10, -(c.logp_all) / (c.cn_w + c.cn_sen))
end
function Result:logp_sample(cla)
local c = self[cla]
return c.logp_all / (c.cn_w + c.cn_sen)
end
function Result:status(cla)
return "LMResult status of " .. cla .. ": " .. "<SEN_CN " .. self[cla].cn_sen .. "> <W_CN " .. self[cla].cn_w .. "> <UNK_CN " .. self[cla].cn_unk .. "> <PPL_NET " .. self:ppl_net(cla) .. "> <PPL_OOV " .. self:ppl_all(cla) .. "> <LOGP " .. self[cla].logp_all .. ">"
end
local Timer = nerv.class("nerv.Timer")
function Timer:__init()
self.last = {}
self.rec = {}
end
function Timer:tic(item)
self.last[item] = os.clock()
end
function Timer:toc(item)
if (self.last[item] == nil) then
nerv.error("item not there")
end
if (self.rec[item] == nil) then
self.rec[item] = 0
end
self.rec[item] = self.rec[item] + os.clock() - self.last[item]
end
function Timer:flush()
for key, value in pairs(self.rec) do
self.rec[key] = nil
end
end
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