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FAQ

• Q1:I get error ./configure --> cannot find blas_segmm() function even I have installed OpenBLAS.

A1: This means the compiler cannot find the OpenBLAS library. If you installed it to $PREFIX (e.g., /opt/OpenBLAS), then you need to export it as

  $ export LIBRARY_PATH=$PREFIX/lib:$LIBRARY_PATH
  # e.g.,
  $ export LIBRARY_PATH=/opt/OpenBLAS/lib:$LIBRARY_PATH

• Q2: I get error cblas.h no such file or directory exists.

Q2: You need to include the folder of the cblas.h into CPLUS_INCLUDE_PATH, e.g.,

  $ export CPLUS_INCLUDE_PATH=$PREFIX/include:$CPLUS_INCLUDE_PATH
  # e.g.,
  $ export CPLUS_INCLUDE_PATH=/opt/OpenBLAS/include:$CPLUS_INCLUDE_PATH
  # then reconfigure and make SINGA
  $ ./configure
  $ make

• Q3:While compiling SINGA, I get error SSE2 instruction set not enabled

A3:You can try following command:

  $ make CFLAGS='-msse2' CXXFLAGS='-msse2'

• Q4:I get ImportError: cannot import name enum_type_wrapper from google.protobuf.internal when I try to import .py files.

A4:After install google protobuf by make install, we should install python runtime libraries. Go to protobuf source directory, run:

  $ cd /PROTOBUF/SOURCE/FOLDER
  $ cd python
  $ python setup.py build
  $ python setup.py install

You may need sudo when you try to install python runtime libraries in the system folder.

• Q5: I get a linking error caused by gflags.

A5: SINGA does not depend on gflags. But you may have installed the glog with gflags. In that case you can reinstall glog using thirdparty/install.sh into a another folder and export the LDFLAGS and CPPFLAGS to include that folder.

• Q6: While compiling SINGA and installing glog on mac OS X, I get fatal error 'ext/slist' file not found

A6:Please install glog individually and try :

  $ make CFLAGS='-stdlib=libstdc++' CXXFLAGS='stdlib=libstdc++'

• Q7: When I start a training job, it reports error related with “ZOO_ERROR…zk retcode=-4…”.

A7: This is because the zookeeper is not started. Please start the zookeeper service

  $ ./bin/zk-service start

If the error still exists, probably that you do not have java. You can simple check it by

  $ java --version

• Q8: When I build OpenBLAS from source, I am told that I need a fortran compiler.

A8: You can compile OpenBLAS by

  $ make ONLY_CBLAS=1

or install it using

    $ sudo apt-get install openblas-dev

or

    $ sudo yum install openblas-devel

It is worth noting that you need root access to run the last two commands. Remember to set the environment variables to include the header and library paths of OpenBLAS after installation (please refer to the Dependencies section).

• Q9: When I build protocol buffer, it reports that GLIBC++_3.4.20 not found in /usr/lib64/libstdc++.so.6.

A9: This means the linker found libstdc++.so.6 but that library belongs to an older version of GCC than was used to compile and link the program. The program depends on code defined in the newer libstdc++ that belongs to the newer version of GCC, so the linker must be told how to find the newer libstdc++ shared library. The simplest way to fix this is to find the correct libstdc++ and export it to LD_LIBRARY_PATH. For example, if GLIBC++_3.4.20 is listed in the output of the following command,

  $ strings /usr/local/lib64/libstdc++.so.6|grep GLIBC++

then you just set your environment variable as

  $ export LD_LIBRARY_PATH=/usr/local/lib64:$LD_LIBRARY_PATH