[JAVA] jblas on Arch Linux

I want to calculate the matrix even in Arch Linux! With Clojure (Java)!

procedure

1. Create an arch linux environment (latest java environment (openjdk), install Ruby as well) (https://qiita.com/elect/items/328c28c310b385de7d23)

2. Next, download the jblas jar file. (From Getting Started-> Download the jar from the downloads page)

3. Try java -server -jar jblas-1.4.2.jar normally.

4. An error like this is returned

    java -jar jblas-1.2.4.jar 
    -- org.jblas INFO jblas version is 1.2.4
    Simple benchmark for jblas
    Running sanity benchmarks.

    checking vector addition... ok
    -- org.jblas CONFIG BLAS native library not found in path. Copying native library from the archive. Consider installing the library somewhere in the path (for Windows: PATH, for Linux: LD_LIBRARY_PATH).
    -- org.jblas CONFIG ArchFlavor native library not found in path. Copying native library libjblas_arch_flavor from the archive. Consider installing the library somewhere in the path (for Windows: PATH, for Linux: LD_LIBRARY_PATH).
    -- org.jblas CONFIG Loading libjblas_arch_flavor.so from /lib/static/Linux/amd64/, copying to libjblas_arch_flavor.so.
    -- org.jblas ERROR Couldn't load copied link file: java.lang.UnsatisfiedLinkError: /tmp/jblas5239787082843388211/libjblas_arch_flavor.so: libgfortran.so.3: cannot open shared object file: No such file or directory.

    On Linux 64bit, you need additional support libraries.
    You need to install libgfortran3.

    For example for debian or Ubuntu, type "sudo apt-get install libgfortran3"

    For more information, see 
    https://github.com/mikiobraun/jblas/wiki/Missing-Libraries
    Exception in thread "main" java.lang.UnsatisfiedLinkError: org.jblas.NativeBlas.dgemm(CCIIID[DII[DIID[DII)V
	at org.jblas.NativeBlas.dgemm(Native Method)
	at org.jblas.SimpleBlas.gemm(SimpleBlas.java:247)
	at org.jblas.DoubleMatrix.mmuli(DoubleMatrix.java:1781)
	at org.jblas.DoubleMatrix.mmul(DoubleMatrix.java:3138)
	at org.jblas.util.SanityChecks.checkMatrixMultiplication(SanityChecks.java:91)
	at org.jblas.util.SanityChecks.main(SanityChecks.java:182)
	at org.jblas.benchmark.Main.main(Main.java:114)
    -- org.jblas INFO Deleting /tmp/jblas5239787082843388211/libjblas_arch_flavor.so
    -- org.jblas INFO Deleting /tmp/jblas5239787082843388211

In short, it means that libgfortran.so.3 cannot be found.

5. Install gcc-6. (yaourt -S gcc6) You will need the libgfortran.so.3 included in this

6. Link with sudo ln -s /usr/lib/gcc/x86_64-pc-linux-gnu/6.XX/libgfortran.so.3 /usr/lib/ (6.XX is the version name) / Paste it under usr / lib (write it with an absolute path)

7. Try java -server -jar jblas-1.2.4.jar again and it works fine

    java -server -jar jblas-1.2.4.jar
    -- org.jblas INFO jblas version is 1.2.4
    Simple benchmark for jblas
    Running sanity benchmarks.
    checking vector addition... ok
    -- org.jblas CONFIG BLAS native library not found in path. Copying native library from the archive. Consider installing the library somewhere in the path (for Windows: PATH, for Linux: LD_LIBRARY_PATH).
    -- org.jblas CONFIG ArchFlavor native library not found in path. Copying native library libjblas_arch_flavor from the archive. Consider installing the library somewhere in the path (for Windows: PATH, for Linux: LD_LIBRARY_PATH).
    -- org.jblas CONFIG Loading libjblas_arch_flavor.so from /lib/static/Linux/amd64/, copying to libjblas_arch_flavor.so.
    -- org.jblas CONFIG Loading libjblas.so from /lib/static/Linux/amd64/sse3/, copying to libjblas.so.
    checking matrix multiplication... ok
    checking existence of dsyev...... ok
    [-0.210656, -0.640445, -0.451188; -0.509085, -0.116445, 0.796815; -0.807515, 0.407556, -0.398408; 0.210656, 0.640445, -0.052780]
    [17.233688; 1.414214; 0.000000]
    [-0.470605, 0.782218, 0.408248; -0.571449, 0.082339, -0.816497; -0.672293, -0.617540, 0.408248]
    [17.233688; 1.414214; 0.000000]
    checking existence of dgesvd...... ok
    Checking complex return values... (z = -21.0 + 88.0i)
    Check whether we're catching XERBLA errors. If you see something like "** On entry to DGEMM  parameter number  4 had an illegal value", it didn't work!
    checking XERBLA... ok
    Sanity checks passed.

    Each benchmark will take about 5 seconds...

    Running benchmark "native matrix multiplication, single precision".
    n = 10   :  1.281 GFLOPS (3203374 iterations in 5.0 seconds)
    n = 100  : 11.192 GFLOPS (27980 iterations in 5.0 seconds)
    n = 1000 : 18.981 GFLOPS (48 iterations in 5.1 seconds)
    -- org.jblas INFO Deleting /tmp/jblas6793705967272229922/libjblas.so
    -- org.jblas INFO Deleting /tmp/jblas6793705967272229922/libjblas_arch_flavor.so
    -- org.jblas INFO Deleting /tmp/jblas6793705967272229922

Now you can use jblas.

Example using jblas (Clojure)

-clatrix Library -incanter Library etc. Matrix operations will be faster, and statistical processing, machine learning, etc. will be possible at higher speeds! Although neandertharl can calculate faster, it is a great advantage to be able to use Incanter, which has functions similar to R. I will.

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