diff --git a/Dockerfile b/Dockerfile
index 13642de1a74e1dbb428725af259e7edc6c0a9de6..5db7fa50747d1998054a1704e5f4d18ca901ea93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -25,6 +25,17 @@ RUN apt-get update && \
     libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
     xz-utils tk-dev libffi-dev liblzma-dev
 
+# Downgrade gcc&&g++
+RUN apt-get update
+WORKDIR /usr/bin
+RUN apt install -y gcc-4.8 g++-4.8
+RUN cp gcc gcc.bak
+RUN cp g++ g++.bak
+RUN rm gcc
+RUN rm g++
+RUN ln -s gcc-4.8 gcc
+RUN ln -s g++-4.8 g++
+
 # Install Python3.6
 RUN mkdir -p /root/python_build/ && wget -q https://www.sqlite.org/2018/sqlite-autoconf-3250300.tar.gz && \
     tar -zxf sqlite-autoconf-3250300.tar.gz && cd sqlite-autoconf-3250300 && \
@@ -56,6 +67,43 @@ RUN apt-get update && \
     net-tools libtool ccache && \
     apt-get clean -y
 
+# Install Python2.7.15 to replace original python
+WORKDIR /home
+ENV version=2.7.15
+RUN wget https://www.python.org/ftp/python/$version/Python-$version.tgz
+RUN tar -xvf Python-$version.tgz
+WORKDIR /home/Python-$version
+RUN ./configure --enable-unicode=ucs4 --enable-shared CFLAGS=-fPIC --prefix=/usr/local/python2.7.15
+RUN make && make install
+
+RUN echo "export PATH=/usr/local/python2.7.15/include:${PATH}" >> ~/.bashrc
+RUN echo "export PATH=/usr/local/python2.7.15/bin:${PATH}" >> ~/.bashrc
+RUN echo "export LD_LIBRARY_PATH=/usr/local/python2.7.15/lib:${LD_LIBRARY_PATH}" >> ~/.bashrc
+RUN echo "export CPLUS_INCLUDE_PATH=/usr/local/python2.7.15/include/python2.7:$CPLUS_INCLUDE_PATH" >> ~/.bashrc
+ENV PATH=/usr/local/python2.7.15/include:${PATH}
+ENV PATH=/usr/local/python2.7.15/bin:${PATH}
+ENV LD_LIBRARY_PATH=/usr/local/python2.7.15/lib:${LD_LIBRARY_PATH}
+ENV CPLUS_INCLUDE_PATH=/usr/local/python2.7.15/include/python2.7:$CPLUS_INCLUDE_PATH
+RUN mv /usr/bin/python /usr/bin/python.bak
+RUN ln -s /usr/local/python2.7.15/bin/python2.7 /usr/local/bin/python
+RUN ln -s /usr/local/python2.7.15/bin/python2.7 /usr/bin/python
+WORKDIR /home
+RUN wget https://files.pythonhosted.org/packages/b0/d1/8acb42f391cba52e35b131e442e80deffbb8d0676b93261d761b1f0ef8fb/setuptools-40.6.2.zip
+RUN apt-get -y install unzip
+RUN unzip setuptools-40.6.2.zip
+WORKDIR /home/setuptools-40.6.2
+RUN python setup.py build
+RUN python setup.py install
+WORKDIR /home
+RUN wget https://files.pythonhosted.org/packages/69/81/52b68d0a4de760a2f1979b0931ba7889202f302072cc7a0d614211bc7579/pip-18.0.tar.gz
+RUN tar -zxvf pip-18.0.tar.gz
+WORKDIR pip-18.0
+RUN python setup.py install
+
+WORKDIR /home
+RUN rm Python-$version.tgz setuptools-40.6.2.zip pip-18.0.tar.gz && \
+    rm -r Python-$version setuptools-40.6.2 pip-18.0
+
 # Install Go and glide
 RUN wget -qO- https://storage.googleapis.com/golang/go1.8.1.linux-amd64.tar.gz | \
     tar -xz -C /usr/local && \
@@ -92,17 +140,16 @@ RUN localedef -i en_US -f UTF-8 en_US.UTF-8
 # specify sphinx version as 1.5.6 and remove -U option for [pip install -U
 # sphinx-rtd-theme] since -U option will cause sphinx being updated to newest
 # version(1.7.1 for now), which causes building documentation failed.
-RUN pip3 --no-cache-dir install -U wheel && \
+RUN pip3 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
     pip3 --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
     pip3 --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark && \
-    pip3.6 --no-cache-dir install -U wheel && \
+    pip3.6 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
     pip3.6 --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
     pip3.6 --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark && \
-    pip3.7 --no-cache-dir install -U wheel && \
+    pip3.7 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
     pip3.7 --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
     pip3.7 --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark && \
-    easy_install -U pip && \
-    pip --no-cache-dir install -U pip setuptools wheel && \
+    pip --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
     pip --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
     pip --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark
 
@@ -125,12 +172,6 @@ RUN pip3.6 --no-cache-dir install pylint pytest astroid isort
 RUN pip3.7 --no-cache-dir install pylint pytest astroid isort
 RUN pip --no-cache-dir install pylint pytest astroid isort LinkChecker
 
-# for coverage
-RUN pip3 --no-cache-dir install coverage
-RUN pip3.6 --no-cache-dir install coverage
-RUN pip3.7 --no-cache-dir install coverage
-RUN pip --no-cache-dir install coverage
-
 COPY ./python/requirements.txt /root/
 RUN pip3 --no-cache-dir install -r /root/requirements.txt
 RUN pip3.6 --no-cache-dir install -r /root/requirements.txt
@@ -166,4 +207,5 @@ RUN mkdir /var/run/sshd
 RUN echo 'root:root' | chpasswd
 RUN sed -ri 's/^PermitRootLogin\s+.*/PermitRootLogin yes/' /etc/ssh/sshd_config
 RUN sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config
+CMD source ~/.bashrc
 EXPOSE 22
diff --git a/cmake/external/eigen.cmake b/cmake/external/eigen.cmake
index dfe81d8f9bf2e25900b2548c707ea778e6aacf09..d6d4b79c7608434f7980e5a7dbc940d9c5a253e8 100644
--- a/cmake/external/eigen.cmake
+++ b/cmake/external/eigen.cmake
@@ -12,6 +12,7 @@ if(NOT WITH_FAST_MATH)
   add_definitions(-DEIGEN_FAST_MATH=0)
 endif()
 
+
 if(WIN32)
     set(EIGEN_GIT_REPOSITORY https://github.com/wopeizl/eigen-git-mirror)
     set(EIGEN_GIT_TAG support_cuda9_win)