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local SL = nerv.class('nerv.SelectLinearLayer', 'nerv.Layer')
--id: string
--global_conf: table
--layer_conf: table
--Get Parameters
function SL:__init(id, global_conf, layer_conf)
self.id = id
self.dim_in = layer_conf.dim_in
self.dim_out = layer_conf.dim_out
self.gconf = global_conf
self.ltp = layer_conf.ltp
self.vocab = layer_conf.vocab
self:check_dim_len(1, 1)
end
--Check parameter
function SL:init(batch_size)
if (self.dim_in[1] ~= 1) then --one word id
nerv.error("mismatching dimensions of ltp and input")
end
if (self.dim_out[1] ~= self.ltp.trans:ncol()) then
nerv.error("mismatching dimensions of bp and output")
end
self.batch_size = bath_size
self.ltp:train_init()
end
function SL:update(bp_err, input, output)
for i = 1, input[1]:nrow(), 1 do
if (input[1][i - 1][0] ~= 0) then
local word_vec = self.ltp.trans[input[1][i - 1][0] - 1]
word_vec:add(word_vec, bp_err[1][i - 1], 1, - self.gconf.lrate / self.gconf.batch_size)
end
end
end
function SL:propagate(input, output)
for i = 0, input[1]:nrow() - 1, 1 do
if (input[1][i][0] > 0) then
output[1][i]:copy_fromd(self.ltp.trans[input[1][i][0] - 1])
else
output[1][i]:fill(0)
end
end
end
function SL:back_propagate(bp_err, next_bp_err, input, output)
--input is compressed, do nothing
end
function SL:get_params()
local paramRepo = nerv.ParamRepo({self.ltp})
return paramRepo
end
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