diff --git a/.travis.yml b/.travis.yml
index e1bd940a3997ba4033a19462d291b4f719901b49..da7d1e3ee488931a58c1dcae0ed5aab13c986726 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ cache:
   directories:
     - $HOME/.ccache
     - $HOME/.cache/pip
-    - $TRAVIS_BUILD_DIR/build/third_party
 sudo: required
 dist: trusty
 os:
@@ -20,6 +19,9 @@ addons:
       - python-wheel
       - clang-format-3.8
       - ccache
+script:
+  /bin/bash ./tests.sh
+
 notifications:
   email:
     on_success: change
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 064e6b2076302eb72c6d02669a4de1a8b6be729a..b0fe4f0276cdeb3540b39a4d545a151e606a9bc7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,12 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.2)
 project(VisualDL)
 
+find_program(CCACHE_FOUND ccache)
+if(CCACHE_FOUND)
+  set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
+  set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
+endif(CCACHE_FOUND)
+
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_FLAGS "-fPIC")
@@ -25,16 +31,16 @@ include_directories(${PROJECT_SOURCE_DIR})
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${PROJECT_SOURCE_DIR}/thirdparty/local/include)
 
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/visualdl/backend/storage)
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/visualdl/backend/logic)
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/visualdl/storage)
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/visualdl/logic)
 
 add_executable(vl_test
-        ${PROJECT_SOURCE_DIR}/visualdl/backend/test.cc
-        ${PROJECT_SOURCE_DIR}/visualdl/backend/storage/storage_test.cc
-        ${PROJECT_SOURCE_DIR}/visualdl/backend/utils/test_concurrency.cc
-        ${PROJECT_SOURCE_DIR}/visualdl/backend/logic/im_test.cc
-        ${PROJECT_SOURCE_DIR}/visualdl/backend/utils/concurrency.h
-        ${PROJECT_SOURCE_DIR}/visualdl/backend/utils/filesystem.h
+        ${PROJECT_SOURCE_DIR}/visualdl/test.cc
+        ${PROJECT_SOURCE_DIR}/visualdl/storage/storage_test.cc
+        ${PROJECT_SOURCE_DIR}/visualdl/utils/test_concurrency.cc
+        ${PROJECT_SOURCE_DIR}/visualdl/logic/im_test.cc
+        ${PROJECT_SOURCE_DIR}/visualdl/utils/concurrency.h
+        ${PROJECT_SOURCE_DIR}/visualdl/utils/filesystem.h
         )
 target_link_libraries(vl_test storage im gtest glog protobuf gflags pthread)
 
diff --git a/tests.sh b/tests.sh
new file mode 100644
index 0000000000000000000000000000000000000000..7e51cb30e28d1597a5aa70db7fb64e3e46f6b3b9
--- /dev/null
+++ b/tests.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+set -ex
+
+sudo pip install numpy
+#sudo apt-get install --only-upgrade cmake -y
+mkdir -p build
+cd build
+cmake ..
+make
+make test
+
+#if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then bash ./travis/run_on_pull_requests; fi
+#if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash ./travis/run_on_non_pull_requests; fi
diff --git a/visualdl/backend/logic/CMakeLists.txt b/visualdl/backend/logic/CMakeLists.txt
deleted file mode 100644
index b28e299a98afe9970d6f9e654ecae39f95f8a6b7..0000000000000000000000000000000000000000
--- a/visualdl/backend/logic/CMakeLists.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-add_library(sdk ${PROJECT_SOURCE_DIR}/visualdl/backend/logic/sdk.cc)
-add_library(im ${PROJECT_SOURCE_DIR}/visualdl/backend/logic/im.cc)
-
-## pybind
-add_library(core SHARED ${PROJECT_SOURCE_DIR}/visualdl/backend/logic/pybind.cc)
-add_dependencies(core pybind python im storage sdk protobuf glog)
-target_link_libraries(core PRIVATE pybind python im storage sdk protobuf glog)
diff --git a/visualdl/logic/CMakeLists.txt b/visualdl/logic/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7f021af7015d585a2d713029323b445f6941cea4
--- /dev/null
+++ b/visualdl/logic/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_library(sdk ${PROJECT_SOURCE_DIR}/visualdl/logic/sdk.cc)
+add_library(im ${PROJECT_SOURCE_DIR}/visualdl/logic/im.cc)
+add_dependencies(im storage_proto)
+add_dependencies(sdk storage_proto)
+
+## pybind
+add_library(core SHARED ${PROJECT_SOURCE_DIR}/visualdl/logic/pybind.cc)
+add_dependencies(core pybind python im storage sdk protobuf glog)
+target_link_libraries(core PRIVATE pybind python im storage sdk protobuf glog)
diff --git a/visualdl/backend/logic/im.cc b/visualdl/logic/im.cc
similarity index 98%
rename from visualdl/backend/logic/im.cc
rename to visualdl/logic/im.cc
index 305fb42c73cf4c6992a7d7fbd71ccbb00f7f7a5d..76d55d225bafe1754d14c351436bfde97041665e 100644
--- a/visualdl/backend/logic/im.cc
+++ b/visualdl/logic/im.cc
@@ -1,7 +1,7 @@
 #include <glog/logging.h>
 #include <ctime>
 
-#include "visualdl/backend/logic/im.h"
+#include "visualdl/logic/im.h"
 
 namespace visualdl {
 
diff --git a/visualdl/backend/logic/im.h b/visualdl/logic/im.h
similarity index 92%
rename from visualdl/backend/logic/im.h
rename to visualdl/logic/im.h
index de884b0a890a97025e90a90342909e9b33a6ba18..5df59e2994807cdfe4a0a5e746f8bbc264759433 100644
--- a/visualdl/backend/logic/im.h
+++ b/visualdl/logic/im.h
@@ -1,12 +1,12 @@
-#ifndef VISUALDL_BACKEND_LOGIC_IM_H
-#define VISUALDL_BACKEND_LOGIC_IM_H
+#ifndef VISUALDL_LOGIC_IM_H
+#define VISUALDL_LOGIC_IM_H
 
 #include <glog/logging.h>
-#include <visualdl/backend/utils/concurrency.h>
 #include <memory>
 #include <string>
 
-#include "visualdl/backend/storage/storage.h"
+#include "visualdl/storage/storage.h"
+#include "visualdl/utils/concurrency.h"
 
 namespace visualdl {
 
diff --git a/visualdl/backend/logic/im_test.cc b/visualdl/logic/im_test.cc
similarity index 94%
rename from visualdl/backend/logic/im_test.cc
rename to visualdl/logic/im_test.cc
index c387565477ee9df0ae8d2872ae6416f79e08ca7e..deaab5e4704063cabb652b1a7940d6321ae93adb 100644
--- a/visualdl/backend/logic/im_test.cc
+++ b/visualdl/logic/im_test.cc
@@ -1,4 +1,4 @@
-#include "visualdl/backend/logic/im.h"
+#include "visualdl/logic/im.h"
 
 #include "gtest/gtest.h"
 
diff --git a/visualdl/backend/logic/pybind.cc b/visualdl/logic/pybind.cc
similarity index 98%
rename from visualdl/backend/logic/pybind.cc
rename to visualdl/logic/pybind.cc
index 4b114a53344c91102876b008f95c77ee797bfe05..7a79429a7dde5f11a9690ab326eb2cf2129610d6 100644
--- a/visualdl/backend/logic/pybind.cc
+++ b/visualdl/logic/pybind.cc
@@ -2,7 +2,7 @@
 #include <pybind11/pybind11.h>
 #include <pybind11/stl.h>
 
-#include "visualdl/backend/logic/sdk.h"
+#include "visualdl/logic/sdk.h"
 
 namespace py = pybind11;
 namespace vs = visualdl;
diff --git a/visualdl/backend/logic/sdk.cc b/visualdl/logic/sdk.cc
similarity index 99%
rename from visualdl/backend/logic/sdk.cc
rename to visualdl/logic/sdk.cc
index b5bebe56d17dcc454560158bade5360f725df07a..513541511d48adc00e1a95f5bf51974fb0b1988f 100644
--- a/visualdl/backend/logic/sdk.cc
+++ b/visualdl/logic/sdk.cc
@@ -1,4 +1,5 @@
-#include "visualdl/backend/logic/sdk.h"
+#include "visualdl/logic/sdk.h"
+
 #include <google/protobuf/text_format.h>
 
 namespace visualdl {
diff --git a/visualdl/backend/logic/sdk.h b/visualdl/logic/sdk.h
similarity index 97%
rename from visualdl/backend/logic/sdk.h
rename to visualdl/logic/sdk.h
index 9948ab709896784cea1c9294a2e4fac0586cee99..3937ffafbb91ac2792cb88a242a3833fa2bfc3e4 100644
--- a/visualdl/backend/logic/sdk.h
+++ b/visualdl/logic/sdk.h
@@ -1,11 +1,11 @@
-#ifndef VISUALDL_BACKEND_LOGIC_SDK_H
-#define VISUALDL_BACKEND_LOGIC_SDK_H
+#ifndef VISUALDL_LOGIC_SDK_H
+#define VISUALDL_LOGIC_SDK_H
 
 #include <glog/logging.h>
 #include <time.h>
 #include <map>
 
-#include "visualdl/backend/logic/im.h"
+#include "visualdl/logic/im.h"
 
 namespace visualdl {
 
diff --git a/visualdl/backend/python/__init__.py b/visualdl/python/__init__.py
similarity index 100%
rename from visualdl/backend/python/__init__.py
rename to visualdl/python/__init__.py
diff --git a/visualdl/backend/python/summary.py b/visualdl/python/summary.py
similarity index 100%
rename from visualdl/backend/python/summary.py
rename to visualdl/python/summary.py
diff --git a/visualdl/backend/python/test_read_service.py b/visualdl/python/test_read_service.py
similarity index 100%
rename from visualdl/backend/python/test_read_service.py
rename to visualdl/python/test_read_service.py
diff --git a/visualdl/backend/python/test_summary.py b/visualdl/python/test_summary.py
similarity index 100%
rename from visualdl/backend/python/test_summary.py
rename to visualdl/python/test_summary.py
diff --git a/visualdl/backend/python/test_write_service.py b/visualdl/python/test_write_service.py
similarity index 100%
rename from visualdl/backend/python/test_write_service.py
rename to visualdl/python/test_write_service.py
diff --git a/visualdl/backend/storage/CMakeLists.txt b/visualdl/storage/CMakeLists.txt
similarity index 100%
rename from visualdl/backend/storage/CMakeLists.txt
rename to visualdl/storage/CMakeLists.txt
diff --git a/visualdl/backend/storage/storage.cc b/visualdl/storage/storage.cc
similarity index 95%
rename from visualdl/backend/storage/storage.cc
rename to visualdl/storage/storage.cc
index 9ed2e20e245d72aba003ce4074bb684c69e11a2f..2b88ad091a9810fb7473c12fa6daa4c2a214017b 100644
--- a/visualdl/backend/storage/storage.cc
+++ b/visualdl/storage/storage.cc
@@ -1,9 +1,9 @@
 #include <glog/logging.h>
-#include <visualdl/backend/utils/concurrency.h>
 #include <fstream>
 
-#include "visualdl/backend/storage/storage.h"
-#include "visualdl/backend/utils/filesystem.h"
+#include "visualdl/storage/storage.h"
+#include "visualdl/utils/concurrency.h"
+#include "visualdl/utils/filesystem.h"
 
 namespace visualdl {
 
diff --git a/visualdl/backend/storage/storage.h b/visualdl/storage/storage.h
similarity index 98%
rename from visualdl/backend/storage/storage.h
rename to visualdl/storage/storage.h
index a827a6dbd8d936ff6f9c8de9c95289cd8cbff0ee..2787d9af87a9547921531b7dc509798a70001b71 100644
--- a/visualdl/backend/storage/storage.h
+++ b/visualdl/storage/storage.h
@@ -5,7 +5,7 @@
 #include <map>
 #include <string>
 
-#include "visualdl/backend/storage/storage.pb.h"
+#include "visualdl/storage/storage.pb.h"
 
 namespace visualdl {
 
diff --git a/visualdl/backend/storage/storage.proto b/visualdl/storage/storage.proto
similarity index 100%
rename from visualdl/backend/storage/storage.proto
rename to visualdl/storage/storage.proto
diff --git a/visualdl/backend/storage/storage_test.cc b/visualdl/storage/storage_test.cc
similarity index 95%
rename from visualdl/backend/storage/storage_test.cc
rename to visualdl/storage/storage_test.cc
index 91c2a59d47ed38f8f6a6eb5affc27305171bbf92..9ddf13a36153b8bbdb2b14ceabea7c79c971efbe 100644
--- a/visualdl/backend/storage/storage_test.cc
+++ b/visualdl/storage/storage_test.cc
@@ -1,4 +1,4 @@
-#include "visualdl/backend/storage/storage.h"
+#include "visualdl/storage/storage.h"
 
 #include <glog/logging.h>
 #include <gtest/gtest.h>
diff --git a/visualdl/backend/test.cc b/visualdl/test.cc
similarity index 100%
rename from visualdl/backend/test.cc
rename to visualdl/test.cc
diff --git a/visualdl/backend/test.py b/visualdl/test.py
similarity index 100%
rename from visualdl/backend/test.py
rename to visualdl/test.py
diff --git a/visualdl/backend/utils/concurrency.h b/visualdl/utils/concurrency.h
similarity index 94%
rename from visualdl/backend/utils/concurrency.h
rename to visualdl/utils/concurrency.h
index 45c8f88cc7b3bad8cb23752da62d3e894971baa9..5a8c320dfd4f57a28c1e420d92166504defd5c25 100644
--- a/visualdl/backend/utils/concurrency.h
+++ b/visualdl/utils/concurrency.h
@@ -1,5 +1,5 @@
-#ifndef VISUALDL_BACKEND_UTILS_CONCURRENCY_H
-#define VISUALDL_BACKEND_UTILS_CONCURRENCY_H
+#ifndef VISUALDL_UTILS_CONCURRENCY_H
+#define VISUALDL_UTILS_CONCURRENCY_H
 
 #include <glog/logging.h>
 #include <chrono>
diff --git a/visualdl/backend/utils/filesystem.h b/visualdl/utils/filesystem.h
similarity index 95%
rename from visualdl/backend/utils/filesystem.h
rename to visualdl/utils/filesystem.h
index 9a509407c12816f77a2a97f1d2ed5e2972a7c531..593013515ca5f0c3b60c47cd1e0476649dd070c4 100644
--- a/visualdl/backend/utils/filesystem.h
+++ b/visualdl/utils/filesystem.h
@@ -1,5 +1,5 @@
-#ifndef VISUALDL_BACKEND_UTILS_FILESYSTEM_H
-#define VISUALDL_BACKEND_UTILS_FILESYSTEM_H
+#ifndef VISUALDL_UTILS_FILESYSTEM_H
+#define VISUALDL_UTILS_FILESYSTEM_H
 
 #include <google/protobuf/text_format.h>
 #include <sys/stat.h>
diff --git a/visualdl/backend/utils/log.h b/visualdl/utils/log.h
similarity index 78%
rename from visualdl/backend/utils/log.h
rename to visualdl/utils/log.h
index 9aed0806d905079b09e37734224bbf2ddb3b376c..2ee54bd33efd665edddeb87ac3d5cf3eec1d6f64 100644
--- a/visualdl/backend/utils/log.h
+++ b/visualdl/utils/log.h
@@ -1,7 +1,8 @@
-#ifndef VISUALDL_BACKEND_UTILS_LOG_H
-#define VISUALDL_BACKEND_UTILS_LOG_H
+#ifndef VISUALDL_UTILS_LOG_H
+#define VISUALDL_UTILS_LOG_H
 
 #include <stdexcept>
+
 namespace visualdl {
 
 namespace log {
diff --git a/visualdl/backend/utils/test_concurrency.cc b/visualdl/utils/test_concurrency.cc
similarity index 81%
rename from visualdl/backend/utils/test_concurrency.cc
rename to visualdl/utils/test_concurrency.cc
index 9657e2d31e16453a790cf052703605da389999a2..96f18caabcf13a49fc4c98f31e3c0f7ff37cede2 100644
--- a/visualdl/backend/utils/test_concurrency.cc
+++ b/visualdl/utils/test_concurrency.cc
@@ -1,4 +1,4 @@
-#include "visualdl/backend/utils/concurrency.h"
+#include "visualdl/utils/concurrency.h"
 
 #include <glog/logging.h>
 #include <gtest/gtest.h>
@@ -16,4 +16,4 @@ TEST(concurrency, test) {
   cc::PeriodExector::Global()(std::move(task), 200);
 }
 
-}  // namespace visualdl
\ No newline at end of file
+}  // namespace visualdl