diff --git a/.travis.yml b/.travis.yml
index 5b14f8e61e6143bb22a3aad5e0a9b11688b1b4be..047ca6ffe79bdaf013f6ef6dbf1a82bdb2f1f2b3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -56,7 +56,7 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo paddle/scripts/travis/before_install.linux.sh; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then paddle/scripts/travis/before_install.osx.sh; fi
   - if [[ "$JOB" == "PRE_COMMIT" ]]; then sudo ln -s /usr/bin/clang-format-3.8 /usr/bin/clang-format; fi
-  - pip install wheel protobuf sphinx recommonmark virtualenv numpy sphinx_rtd_theme pre-commit
+  - pip install wheel protobuf sphinx recommonmark virtualenv numpy sphinx_rtd_theme pre-commit requests==2.9.2 LinkChecker
 script:
   - paddle/scripts/travis/main.sh
 notifications:
diff --git a/paddle/gserver/tests/test_ConvTrans.cpp b/paddle/gserver/tests/test_ConvTrans.cpp
index 99202c2d5702a9569c3a9a92897a8a0e38b8e2a6..dd3378304b433c135881310eb89273b6bf492af2 100644
--- a/paddle/gserver/tests/test_ConvTrans.cpp
+++ b/paddle/gserver/tests/test_ConvTrans.cpp
@@ -206,8 +206,8 @@ TEST(Layer, convTransLayerFwd2) {
                  /* filter_size */ 5,
                  result);
 
-  float resultData[] = {1, 2, 2, 2, 1, 2, 4, 4, 4, 2, 2, 4, 4,
-                        4, 2, 2, 4, 4, 4, 2, 1, 2, 2, 2, 1};
+  real resultData[] = {1, 2, 2, 2, 1, 2, 4, 4, 4, 2, 2, 4, 4,
+                       4, 2, 2, 4, 4, 4, 2, 1, 2, 2, 2, 1};
   result->setData(resultData);
   doOneConvtTest(/* imgSize */ 5,
                  /* output_x */ 2,
@@ -216,8 +216,8 @@ TEST(Layer, convTransLayerFwd2) {
                  /* filter_size */ 4,
                  result);
 
-  float resultData2[] = {1, 2, 2, 2, 1, 2, 4, 4, 4, 2, 2, 4, 4,
-                         4, 2, 2, 4, 4, 4, 2, 1, 2, 2, 2, 1};
+  real resultData2[] = {1, 2, 2, 2, 1, 2, 4, 4, 4, 2, 2, 4, 4,
+                        4, 2, 2, 4, 4, 4, 2, 1, 2, 2, 2, 1};
   result->setData(resultData2);
   doOneConvtTest(/* imgSize */ 5,
                  /* output_x */ 2,
@@ -226,8 +226,8 @@ TEST(Layer, convTransLayerFwd2) {
                  /* filter_size */ 5,
                  result);
 
-  float resultData3[] = {1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 2, 2, 4,
-                         2, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1};
+  real resultData3[] = {1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 2, 2, 4,
+                        2, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1};
   result->setData(resultData3);
   doOneConvtTest(/* imgSize */ 5,
                  /* output_x */ 2,
diff --git a/paddle/gserver/tests/test_ConvUnify.cpp b/paddle/gserver/tests/test_ConvUnify.cpp
index 2ab18f886848d198b9063c7559790497ce131efe..ad99b50245cf56eb7db227fa582f6e3f41b47a7a 100644
--- a/paddle/gserver/tests/test_ConvUnify.cpp
+++ b/paddle/gserver/tests/test_ConvUnify.cpp
@@ -106,8 +106,8 @@ TEST(Layer, convParaUnified) {
 #ifndef PADDLE_ONLY_CPU
   MatrixPtr input, resultCpu, resultGpu;
   input = Matrix::create(1, 4 * 4, false, false);
-  float inputData[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
-  float param[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 8, 7, 6, 5, 4, 3, 2, 1};
+  real inputData[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
+  real param[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 8, 7, 6, 5, 4, 3, 2, 1};
 
   input->setData(inputData);
 
@@ -137,26 +137,9 @@ TEST(Layer, convParaUnified) {
   checkMatrixEqual(resultCpu, resultGpu);
 
   input = Matrix::create(1, 3 * 3 * 2, false, false);
-  float inputData2[] = {1,
-                        2,
-                        3,
-                        4,
-                        5,
-                        6,
-                        7,
-                        8,
-                        9,
-
-                        10,
-                        11,
-                        12,
-                        13,
-                        14,
-                        15,
-                        16,
-                        17,
-                        18};
-  float param2[] = {1, 2, 3, 4, 5, 6, 7, 8, 8, 7, 6, 5, 4, 3, 2, 1};
+  real inputData2[] = {
+      1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18};
+  real param2[] = {1, 2, 3, 4, 5, 6, 7, 8, 8, 7, 6, 5, 4, 3, 2, 1};
 
   input->setData(inputData2);
 
@@ -185,7 +168,7 @@ TEST(Layer, convParaUnified) {
                             true);
   checkMatrixEqual(resultCpu, resultGpu);
 
-  float param3[] = {1, 2, 3, 4, 4, 3, 2, 1};
+  real param3[] = {1, 2, 3, 4, 4, 3, 2, 1};
 
   resultCpu = doOneConvTest(/* imgSize */ 3,
                             /* output_x */ 2,
diff --git a/paddle/parameter/ParameterUpdaterBase.h b/paddle/parameter/ParameterUpdaterBase.h
index 88148d9b769e9b6eca90f9651a121e926543d7c2..b230e170c15f1b004c5357fb7d0ad2204d01f44b 100644
--- a/paddle/parameter/ParameterUpdaterBase.h
+++ b/paddle/parameter/ParameterUpdaterBase.h
@@ -38,7 +38,7 @@ public:
   virtual void startPass() {}
 
   // called by Trainer then finishing a pass, ruturn true if pass accepted
-  virtual bool finishPass(real cost = 0) { return true; }
+  virtual bool finishPass() { return true; }
 
   // called by Trainer before backward() of a batch
   // Return the type of pass it needs. This pass type will be passed
@@ -112,9 +112,9 @@ public:
         [&](int tid, size_t numThreads) { updaters_[tid]->startPass(); });
   }
 
-  virtual bool finishPass(real cost = 0) {
+  virtual bool finishPass() {
     syncThreadPool_->execPlusOwner(
-        [&](int tid, size_t numThreads) { updaters_[tid]->finishPass(cost); });
+        [&](int tid, size_t numThreads) { updaters_[tid]->finishPass(); });
     return true;
   }
 
diff --git a/paddle/scripts/travis/docs.sh b/paddle/scripts/travis/docs.sh
index 0bbb76a8a3caa27da0911af0fe87df7fbff617b4..8690fe1d40c935e119fefbc02f3a228d76d8c0f9 100755
--- a/paddle/scripts/travis/docs.sh
+++ b/paddle/scripts/travis/docs.sh
@@ -7,6 +7,10 @@ source ./common.sh
 cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_GPU=OFF -DWITH_DOC=ON
 make paddle_docs paddle_docs_cn
 
+# check websites for broken links
+linkchecker doc/en/html/index.html
+linkchecker doc/cn/html/index.html
+
 # Parse Github URL
 REPO=`git config remote.origin.url`
 SSH_REPO=${REPO/https:\/\/github.com\//git@github.com:}
@@ -35,8 +39,8 @@ git checkout $TARGET_BRANCH || git checkout --orphan $TARGET_BRANCH
 
 # remove old docs. mv new docs.
 rm -rf doc doc_cn
-mv ../doc_cn/html doc_cn
-mv ../doc/html doc
+mv ../doc/cn/html doc_cn
+mv ../doc/en/html doc
 
 # Check is there anything changed.
 set +e
diff --git a/paddle/trainer/ParameterUpdater.h b/paddle/trainer/ParameterUpdater.h
index 4dae77567f8f4d097c583567275d4b90122feb6a..c3207e63ce72b73a57c2e40c72c5259f0ae61bc9 100644
--- a/paddle/trainer/ParameterUpdater.h
+++ b/paddle/trainer/ParameterUpdater.h
@@ -102,9 +102,9 @@ public:
    * @param cost sum cost during one pass.
    * @return true if accept (used for owlqn).
    */
-  virtual bool finishPass(real cost) {
+  virtual bool finishPass() {
     optimizer_->finishPass();
-    return ParameterUpdater::finishPass(cost);
+    return ParameterUpdater::finishPass();
   }
 
   /**
@@ -220,9 +220,9 @@ public:
     averager_->startPass();
     SgdLocalUpdater::startPass();
   }
-  virtual bool finishPass(real cost) {
+  virtual bool finishPass() {
     averager_->finishPass();
-    return SgdLocalUpdater::finishPass(cost);
+    return SgdLocalUpdater::finishPass();
   }
 
   /// apply the averaged parameter to PARAMETER_VALUE
diff --git a/paddle/trainer/RemoteParameterUpdater.cpp b/paddle/trainer/RemoteParameterUpdater.cpp
index 630f55d998d9f5b5b2880aa02b025e6e56e1f064..6939738203f41e0c1f7204d54834e34b2cd90682 100644
--- a/paddle/trainer/RemoteParameterUpdater.cpp
+++ b/paddle/trainer/RemoteParameterUpdater.cpp
@@ -309,7 +309,7 @@ void RemoteParameterUpdater::startPass() {
   }
 }
 
-bool RemoteParameterUpdater::finishPass(real cost) {
+bool RemoteParameterUpdater::finishPass() {
   if (localUpdater_) {
     localUpdater_->finishPass();
   }
@@ -712,7 +712,7 @@ void SparseRemoteParameterUpdater::startPass() {
   }
 }
 
-bool SparseRemoteParameterUpdater::finishPass(real cost) {
+bool SparseRemoteParameterUpdater::finishPass() {
   if (config_.algorithm() == TrainAlgorithm::SGD) {
     parameterClient_->waitPassFinish();
   } else {
diff --git a/paddle/trainer/RemoteParameterUpdater.h b/paddle/trainer/RemoteParameterUpdater.h
index ec6ed443d33db1d695194092b34d6090a4b5ab94..7794b209009a3429e810074b61e1d5bffa8b3a4e 100644
--- a/paddle/trainer/RemoteParameterUpdater.h
+++ b/paddle/trainer/RemoteParameterUpdater.h
@@ -90,7 +90,7 @@ public:
    */
   virtual void finishBatch(real cost);
   virtual void startPass();
-  virtual bool finishPass(real cost);
+  virtual bool finishPass();
 
 #ifndef PADDLE_DISABLE_TIMER
   virtual void setForwardbackwardTime(uint64_t delta) {
@@ -281,7 +281,7 @@ public:
   /// send all sparse related parameters to all pservers
   virtual void finishBatch(real cost);
   virtual void startPass();
-  virtual bool finishPass(real cost);
+  virtual bool finishPass();
 
   virtual void apply();
   virtual void restore();
diff --git a/paddle/trainer/ThreadParameterUpdater.cpp b/paddle/trainer/ThreadParameterUpdater.cpp
index 2a76d5723ccb68896f8ddbfad31a9d7d84adcf55..870d4a4b0246fe244bbd3796ec14449eb181aad2 100644
--- a/paddle/trainer/ThreadParameterUpdater.cpp
+++ b/paddle/trainer/ThreadParameterUpdater.cpp
@@ -70,7 +70,7 @@ void SgdThreadUpdater::startPass() {
   }
 }
 
-bool SgdThreadUpdater::finishPass(real cost) {
+bool SgdThreadUpdater::finishPass() {
   catchUpWith();
 
   for (auto& para : parameters_) {
diff --git a/paddle/trainer/ThreadParameterUpdater.h b/paddle/trainer/ThreadParameterUpdater.h
index 198435c0f30056a9467b8a076c8443ae243e7c3f..880f1f9ddc49a1193ce23901419d988cae84eb88 100644
--- a/paddle/trainer/ThreadParameterUpdater.h
+++ b/paddle/trainer/ThreadParameterUpdater.h
@@ -47,7 +47,7 @@ public:
   virtual void startPass();
 
   // Use the finishPass() function of the base optimizer.
-  virtual bool finishPass(real cost);
+  virtual bool finishPass();
 
   virtual void init(const std::vector<ParameterPtr>& parameters);
   virtual PassType startBatch(int64_t batchSize);
diff --git a/paddle/trainer/Trainer.cpp b/paddle/trainer/Trainer.cpp
index 1eec2c432d235ef484b688db08aae8a39f878a85..031e3b7cf199c197a9cafbf809afe4dfab15b87b 100644
--- a/paddle/trainer/Trainer.cpp
+++ b/paddle/trainer/Trainer.cpp
@@ -537,7 +537,7 @@ void Trainer::trainOnePassBatch(int passId) {
 
   trainerInternal_.getGradientMachine()->onPassEnd();
 
-  bool accepted = trainerInternal_.getParameterUpdater()->finishPass(cost);
+  bool accepted = trainerInternal_.getParameterUpdater()->finishPass();
 
   globalStat.setThreadInfo(true);
   globalStat.printAllStatus();