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Update LSTM_LN.lua #1

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19 changes: 10 additions & 9 deletions torch_modules/LSTM_LN.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -9,18 +9,20 @@ function LSTM.lstm(inputSize, hiddenSize)
local prev_c = nn.Identity()()
local prev_h = nn.Identity()()

function new_input_sum_bias(bias)
function new_input_sum()
-- transforms input
local i2h = nn.Linear(inputSize, hiddenSize)(x)
local i2h = nn.Linear(inputSize, hiddenSize, false)(x) -- no bias
-- transforms previous timestep's output
local h2h = nn.Linear(hiddenSize, hiddenSize)(prev_h)
return nn.CAddTable()({i2h, h2h})
local h2h = nn.Linear(hiddenSize, hiddenSize, false)(prev_h) -- no bias

-- add a bias term here
return nn.Add(hiddenSize)(nn.CAddTable()({i2h, h2h}))
end

local in_gate = nn.Sigmoid()(new_input_sum_bias(0))
local forget_gate = nn.Sigmoid()(new_input_sum_bias(-4.))
local out_gate = nn.Sigmoid()(new_input_sum_bias(0))
local in_transform = nn.Tanh()(new_input_sum_bias(0))
local in_gate = nn.Sigmoid()(new_input_sum())
local forget_gate = nn.Sigmoid()(new_input_sum())
local out_gate = nn.Sigmoid()(new_input_sum())
local in_transform = nn.Tanh()(new_input_sum())

local next_c = nn.CAddTable()({
nn.CMulTable()({forget_gate, prev_c}),
Expand All @@ -34,4 +36,3 @@ function LSTM.lstm(inputSize, hiddenSize)
end

return LSTM