From 4d48cb10ba5bcd6e441a1919d61a64d0a6b4bee9 Mon Sep 17 00:00:00 2001
From: txh18 <cloudygooseg@gmail.com>
Date: Fri, 30 Oct 2015 00:21:40 +0800
Subject: still working in lmseqreader

---
 nerv/examples/lmptb/lmptb/lmseqreader.lua        | 61 ++++++++++++++++--------
 nerv/examples/lmptb/m-tests/lmseqreader_test.lua |  5 +-
 nerv/examples/lmptb/m-tests/some-text            | 20 ++++----
 3 files changed, 54 insertions(+), 32 deletions(-)

diff --git a/nerv/examples/lmptb/lmptb/lmseqreader.lua b/nerv/examples/lmptb/lmptb/lmseqreader.lua
index edc3ff4..26dc3be 100644
--- a/nerv/examples/lmptb/lmptb/lmseqreader.lua
+++ b/nerv/examples/lmptb/lmptb/lmseqreader.lua
@@ -7,10 +7,11 @@ local printf = nerv.printf
 --global_conf: table
 --batch_size: int
 --vocab: nerv.LMVocab
-function LMReader:__init(global_conf, batch_size, vocab)
+function LMReader:__init(global_conf, batch_size, seq_size, vocab)
     self.gconf = global_conf
     self.fh = nil --file handle to read, nil means currently no file
     self.batch_size = batch_size
+    self.seq_size = seq_size
     self.log_pre = "[LOG]LMFeeder:"
     self.vocab = vocab
     self.streams = nil
@@ -26,12 +27,12 @@ function LMReader:open_file(fn)
     self.fh = io.open(fn, "r")
     self.streams = {}
     for i = 1, self.batch_size, 1 do
-        self.streams[i] = {["store"] = {self.vocab.sen_end_token}, ["head"] = 1, ["tail"] = 1}
+        self.streams[i] = {["store"] = {}, ["head"] = 1, ["tail"] = 0}
     end
 end
    
 --id: int
---Refresh stream id,  read a line from file
+--Refresh stream id,  read a line from file, will check whether this line is cntklm-style
 function LMReader:refresh_stream(id)
     if (self.streams[id] == nil) then
         nerv.error("stream %d does not exit.", id)
@@ -40,41 +41,61 @@ function LMReader:refresh_stream(id)
     if (st.store[st.head] ~= nil) then return end
     if (self.fh == nil) then return end
     local list = self.vocab:read_line(self.fh)
-    if (list[1] ~= self.vocab.sen_end_token or list[#list] ~= self.vocab.sen_end_token) then --check for cntk style input
-        nerv.error("sentence not begin or end with </s> : %s", table.tostring(list));
-    end
     if (list == nil) then --file has end
         printf("%s file expires, closing.\n", self.log_pre)
         self.fh:close() 
         self.fh = nil 
         return 
     end
+
+    --some sanity check
+    if (list[1] ~= self.vocab.sen_end_token or list[#list] ~= self.vocab.sen_end_token) then --check for cntklm style input
+        nerv.error("%s sentence not begin or end with </s> : %s", self.log_pre, table.tostring(list));
+    end
+    for i = 2, #list - 1, 1 do
+        if (list[i] == self.vocab.sen_end_token) then
+            nerv.error("%s Got </s> in the middle of a line(%s) in file", self.log_pre, table.tostring(list))
+        end
+    end
+
     for i = 1, #list, 1 do
         st.tail = st.tail + 1
         st.store[st.tail] = list[i]
     end
 end
 
---Returns: nil/table
---If gets something, return a list of string, vocab.null_token indicates end of string
-function LMReader:get_batch()
+function LMReader:get_batch(input, label)
     local got_new = false
     local list = {}
-    for i = 1, self.batch_size, 1 do
-        self:refresh_stream(i)
+    for i = 1, self.seq_size, 1 do
         local st = self.streams[i]
-        list[i] = st.store[st.head]
-        if (list[i] == nil) then list[i] = self.vocab.null_token end
-        if (list[i] ~= nil and list[i] ~= self.vocab.null_token)then
-            got_new = true
-            st.store[st.head] = nil
-            st.head = st.head + 1
-        end 
+        for j = 1, self.batch_size, 1 do
+            self:refresh_stream(i)
+            if (st.store[st.head] ~= nil) then
+                input[i][j] = st.store[st.head]
+            else
+                input[i][j] = self.vocab.null_token
+            end
+            if (st.store[st.head + 1] ~= nil) then
+                label[i][j] = st.store[st.head + 1]
+            else
+                label[i][j] = self.vocab.null_token
+            end
+            if (input[i][j] ~= self.vocab.null_token) then
+                got_new = true
+                st.store[st.head] = nil
+                st.head = st.head + 1
+                if (label[i][j] == self.vocab.sen_end_token) then
+                    st.store[st.head] = nil --sentence end is passed
+                    st.head = st.head + 1
+                end
+            end 
+        end
     end
     if (got_new == false) then
-        return nil
+        return false
     else
-        return list
+        return true
     end
 end
 
diff --git a/nerv/examples/lmptb/m-tests/lmseqreader_test.lua b/nerv/examples/lmptb/m-tests/lmseqreader_test.lua
index b90e651..bdea740 100644
--- a/nerv/examples/lmptb/m-tests/lmseqreader_test.lua
+++ b/nerv/examples/lmptb/m-tests/lmseqreader_test.lua
@@ -6,8 +6,9 @@ local test_fn = "/home/slhome/txh18/workspace/nerv/nerv/nerv/examples/lmptb/m-te
 --local test_fn = "/home/slhome/txh18/workspace/nerv-project/nerv/examples/lmptb/PTBdata/ptb.train.txt"
 local vocab = nerv.LMVocab()
 vocab:build_file(test_fn)
-local batch_size = 3
-local reader = nerv.LMSeqReader({}, batch_size, vocab)
+local batch_size = 5
+local seq_size = 3
+local reader = nerv.LMSeqReader({}, batch_size, seq_size, vocab)
 reader:open_file(test_fn)
 while (1) do
     local list = reader:get_batch()
diff --git a/nerv/examples/lmptb/m-tests/some-text b/nerv/examples/lmptb/m-tests/some-text
index e905b60..cdfbd2c 100644
--- a/nerv/examples/lmptb/m-tests/some-text
+++ b/nerv/examples/lmptb/m-tests/some-text
@@ -1,10 +1,10 @@
-aa bb cc aa bb cc aa bb cc aa bb cc aa bb cc aa
-aa bb cc aa bb cc aa bb cc aa
-aa bbcc aa bb cc aa bb cc aa
-aa bb cc aa
-aa bb cc aa
-aa bb cc aa
-aa
-aa bb cc aa
-aa bb cc aa
-aa bb cc aa bb cc aa
+</s> aa bb cc aa bb cc aa bb cc aa bb cc aa bb cc aa </s>
+</s> aa bb cc aa bb cc aa bb cc aa </s>
+</s> aa bb cc aa bb cc aa bb cc aa </s>
+</s> aa bb cc aa </s>
+</s> aa bb cc aa </s>
+</s> aa bb cc aa </s>
+</s> aa </s>
+</s> aa bb cc aa </s>
+</s> aa bb cc aa </s>
+</s> aa bb cc aa bb cc aa </s>
-- 
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