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LSTM: Move Wx matrix multiplication out of the loop in forward #187

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LSTM: Move Wx matrix multiplication out of the loop in forward #187

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5 changes: 2 additions & 3 deletions LSTM.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -143,7 +143,7 @@ function layer:updateOutput(input)
end
end

local bias_expand = self.bias:view(1, 4 * H):expand(N, 4 * H)
local bias_expand = self.bias:view(1, 4 * H):expand(N * T, 4 * H)
local Wx = self.weight[{{1, D}}]
local Wh = self.weight[{{D + 1, D + H}}]

Expand All @@ -152,12 +152,11 @@ function layer:updateOutput(input)
c:resize(N, T, H):zero()
local prev_h, prev_c = h0, c0
self.gates:resize(N, T, 4 * H):zero()
self.gates:view(N * T, 4 * H):addmm(bias_expand, x:view(N * T, D), Wx)
for t = 1, T do
local cur_x = x[{{}, t}]
local next_h = h[{{}, t}]
local next_c = c[{{}, t}]
local cur_gates = self.gates[{{}, t}]
cur_gates:addmm(bias_expand, cur_x, Wx)
cur_gates:addmm(prev_h, Wh)
cur_gates[{{}, {1, 3 * H}}]:sigmoid()
cur_gates[{{}, {3 * H + 1, 4 * H}}]:tanh()
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