From 620c1971c3c821337cd16cca20cddd27f7bc6085 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Thu, 18 Feb 2016 18:04:06 +0800
Subject: generalize softmax_ce.lua (to softmax_ce_t.lua)

---
 nerv/layer/softmax_ce.lua | 44 +++++++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 13 deletions(-)

diff --git a/nerv/layer/softmax_ce.lua b/nerv/layer/softmax_ce.lua
index 31a2ad7..d7d650e 100644
--- a/nerv/layer/softmax_ce.lua
+++ b/nerv/layer/softmax_ce.lua
@@ -17,31 +17,46 @@ function SoftmaxCELayer:__init(id, global_conf, layer_conf)
     self:check_dim_len(2, -1) -- two inputs: nn output and label
 end
 
-function SoftmaxCELayer:init(batch_size)
+function SoftmaxCELayer:init(batch_size, chunk_size)
     if not self.compressed and (self.dim_in[1] ~= self.dim_in[2]) then
         nerv.error("mismatching dimensions of previous network output and labels")
     end
+    if chunk_size == nil then
+        chunk_size = 1
+    end
     self.total_ce = 0.0
     self.total_correct = 0
     self.total_frames = 0
-    self.softmax = self.mat_type(batch_size, self.dim_in[1])
-    self.ce = self.softmax:create()
+    self.softmax = {}
+    self.ce = {}
+    for t = 1, chunk_size do
+        self.softmax[t] = self.mat_type(batch_size, self.dim_in[1])
+        self.ce[t] = self.softmax[t]:create()
+    end
 end
 
-function SoftmaxCELayer:batch_resize(batch_size)
-    if self.softmax:nrow() ~= batch_resize then
-        self.softmax = self.mat_type(batch_size, self.dim_in[1])
-        self.ce = self.softmax:create()
+function SoftmaxCELayer:batch_resize(batch_size, chunk_size)
+    if chunk_size == nil then
+        chunk_size = 1
+    end
+    for t = 1, chunk_size do
+        if self.softmax[t]:nrow() ~= batch_size then
+            self.softmax[t] = self.mat_type(batch_size, self.dim_in[1])
+            self.ce[t] = self.softmax:create()
+        end
     end
 end
 
-function SoftmaxCELayer:update(bp_err, input, output)
+function SoftmaxCELayer:update(bp_err, input, output, t)
     -- no params, therefore do nothing
 end
 
-function SoftmaxCELayer:propagate(input, output)
-    local softmax = self.softmax
-    local ce = self.ce
+function SoftmaxCELayer:propagate(input, output, t)
+    if t == nil then
+        t = 1
+    end
+    local softmax = self.softmax[t]
+    local ce = self.ce[t]
     local classified = softmax:softmax(input[1])
     local label = input[2]
     ce:log_elem(softmax)
@@ -62,14 +77,17 @@ function SoftmaxCELayer:propagate(input, output)
     end
 end
 
-function SoftmaxCELayer:back_propagate(bp_err, next_bp_err, input, output)
+function SoftmaxCELayer:back_propagate(bp_err, next_bp_err, input, output, t)
     -- softmax output - label
+    if t == nil then
+        t = 1
+    end
     local label = input[2]
     if self.compressed then
         label = label:decompress(input[1]:ncol())
     end
     local nbe = next_bp_err[1]
-    nbe:add(self.softmax, label, 1.0, -1.0)
+    nbe:add(self.softmax[t], label, 1.0, -1.0)
     if bp_err[1] ~= nil then
         nbe:scale_rows_by_col(bp_err[1])
     end
-- 
cgit v1.2.3