Fast Artificial Neural Network Library

Installing FANN

Copies of FANN can be obtained from our Download page.

FANN is available under the terms of the GNU Lesser General Public License.

FANN bindings to several other programming languages is also available from the Language Bindings page.

Windows Installation

FANN includes prebuilt DLL and LIB files as well as prebuilt executables for some of the examples. To use these in your own project, simply reference the DLL/LIB files as well as the header files.

To compile FANN and the examples yourself, you will need Visual Studio 2010 or use the Cross Platform Install method described below.

To build the library and examples with Visual Studio 2010, first navigate to the VS2010 directory in the FANN distribution and open the fann.sln solution. In the Visual Studio menu bar, choose “Build” -> “Build Solution”. When the build process is complete, the library and examples can be found in the “bin” directory.

Cross Platform Install

The FANN cross platform install system is based on CMAKE and have been tested on ubuntu Linux and Mac OSX, but should work on other platforms too. Once you have installed CMAKE, you can execute the following commands, in the FANN directory, to compile and install FANN.

cmake .
sudo make install

Once you have installed the library you can test it out by going to the examples directory and type make runtest, which will compile the examples and run a few of them to test that everything is working.

Sometimes you want to install to a different location than the default /usr/local. You can do that by adding the CMAKE_INSTALL_PREFIX to cmake, by for example installing to /usr like this cmake -D CMAKE_INSTALL_PREFIX:PATH=/usr .

When all else fails

FANN is pretty simple and does not require a lot of extra stuff, so when all else fails, simply include the file doublefann.c or floatfann.c in your project and everything should work.

An example of how this is done can be seen in the rundebugtest target in examples/Makefile.

29 Comments

  1. February 9, 2012    

    ./xor_train: error while loading shared libraries: libfann.so.2: cannot open shared object file: No such file or directory
    make: *** [runtest] Error 127

    what this error about?

    • Yas Yas
      March 15, 2012    

      I got the same error when installing in Ubuntu. Can any one help on this matter?

      • Igor Igor
        October 7, 2012    

        run “ldconfig” command

        • November 1, 2012    

          Running ldconfig with sudo worked for me! Thanks.

          • fafa fafa
            November 13, 2013    

            thanks. good job.

        • Kaël Kaël
          December 13, 2012    

          This works fine for me too, thx!

          • Andres Andres
            April 10, 2015    

            Worked for me aswell!

  2. ryan ryan
    March 13, 2012    

    @Dek Wan :
    You got this error because the /usr/local/lib isn’t in your library path, a simple solution could be to add a symbolic link to your actual library path, try this out :

    $> ln -s /usr/local/lib/*fann* /usr/lib/

  3. Yas Yas
    March 15, 2012    

    Actually installation was successful but when running the example given above gave this error

    Training network
    ./xor_train
    ./xor_train: error while loading shared libraries: libfann.so.2: cannot open shared object file: No such file or directory
    make: *** [runtest] Error 127

    • ryan ryan
      March 16, 2012    

      Try this out :
      $> ln -s /usr/local/lib/*fann* /usr/lib/

      or simply copy by hand all the installed files in the /local/lib/library (if you didn’t change the install path) to the /usr/lib folder, it’s actually the simplest solution I got, with no need to change the library path of your system.

  4. John John
    March 19, 2012    

    I install fann correctly, also xor example works fine. But I modify the xor.data in the example directory to be
    5 2 1
    1.200000 1.133333
    0
    1.266667 1.000000
    0
    1.266667 1.200000
    0
    2.066667 5.266667
    1
    0.594595 1.513514
    2
    Also, xor_train.c: max_epochs to be 500000. The others are the same. But the result is not that right:
    XOR test (1.200000,1.133333) -> 0.014159, should be 0.000000, difference=0.014159
    XOR test (1.266667,1.000000) -> 0.014159, should be 0.000000, difference=0.014159
    XOR test (1.266667,1.200000) -> 0.014159, should be 0.000000, difference=0.014159
    XOR test (2.066667,5.266667) -> 1.000000, should be 1.000000, difference=-0.000000
    XOR test (0.594595,1.513514) -> 1.000000, should be 2.000000, difference=1.000000
    Any ideas what should I do now? Many thanks.

  5. Dan Dan
    March 30, 2012    

    To anyone seeing the error:

    ./xor_train: error while loading shared libraries: libfann.so.2: cannot open shared object file: No such file or directory
    make: *** [runtest] Error 127

    This happens when you install a shared library and don’t run ldconfig after. I was able to get it to work by running “sudo ldconfig” after installation.

  6. Søren Hilmer Søren Hilmer
    June 6, 2012    

    When I do the cmake . on Ubuntu 12.04, I get:


    CMake Error at CMakeLists.txt:13 (SET_TARGET_PROPERTIES):
    set_target_properties called with incorrect number of arguments.

    CMake Error at CMakeLists.txt:14 (INSTALL):
    install TARGETS given no LIBRARY DESTINATION for shared library target
    "floatfann".

    CMake Error at CMakeLists.txt:25 (SET_TARGET_PROPERTIES):
    set_target_properties called with incorrect number of arguments.

    CMake Error at CMakeLists.txt:26 (INSTALL):
    install TARGETS given no LIBRARY DESTINATION for shared library target
    "doublefann".

    CMake Error at CMakeLists.txt:37 (SET_TARGET_PROPERTIES):
    set_target_properties called with incorrect number of arguments.

    CMake Error at CMakeLists.txt:38 (INSTALL):
    install TARGETS given no LIBRARY DESTINATION for shared library target
    "fixedfann".

    CMake Error at CMakeLists.txt:49 (SET_TARGET_PROPERTIES):
    set_target_properties called with incorrect number of arguments.

    CMake Error at CMakeLists.txt:50 (INSTALL):
    install TARGETS given no LIBRARY DESTINATION for shared library target
    "fann".

    CMake Warning (dev) in CMakeLists.txt:
    No cmake_minimum_required command is present. A line of code such as

    cmake_minimum_required(VERSION 2.8)

    should be added at the top of the file. The version specified may be lower
    if you wish to support older CMake versions for this project. For more
    information run "cmake --help-policy CMP0000".
    This warning is for project developers. Use -Wno-dev to suppress it.

    -- Configuring incomplete, errors occurred!

    How can I fix this?

    • Venkata Gadde Venkata Gadde
      October 8, 2012    

      I have the same error message. I have Ubuntu 12.04 64-bit on my desktop.

      • Ann Ann
        November 27, 2012    

        I had the same problem. The problem was that I run cmake inside src/ directory. But you should cmake it in the top level of unzipped FANN code.

    • Jessey Jessey
      November 28, 2012    

      I had this problem, and I think it was caused by the fact that I did not know how to use cmake properly. Initially, I tried running “cmake src/” instead of “cmake .” I just re-extracted the zip folder and tried again running the correct command and it worked.

  7. jigar jigar
    September 22, 2012    

    After i installed the program, When i try to run the sample train program, it is giving error
    nn_training.c:(.text+0x62): undefined reference to `fann_create_standard’
    nn_training.c:(.text+0x7a): undefined reference to `fann_set_activation_function_hidden’
    nn_training.c:(.text+0x8e): undefined reference to `fann_set_activation_function_output’
    nn_training.c:(.text+0xba): undefined reference to `fann_train_on_file’
    nn_training.c:(.text+0xce): undefined reference to `fann_save’
    nn_training.c:(.text+0xda): undefined reference to `fann_destroy’

    This is because the file “fann.h” is not getting linked properly.
    How to solve this error??

  8. dhivya dhivya
    January 27, 2013    

    this is very easy manner to search details about fann

  9. Bhupendra Bhupendra
    March 15, 2013    

    Im using FANN on my Macbookpro. I have installed it very easily but testrun is failed. Can someone have a look at it tell me if there is any issue with my installation?
    Console output follows:

    bhupendra@vpn examples$ make runtest
    gcc -O3 xor_train.c -o xor_train -lfann -lm
    gcc -O3 xor_test.c -o xor_test -lfann -lm
    gcc -O3 -DFIXEDFANN xor_test.c -o xor_test_fixed -lfixedfann -lm
    gcc -O3 simple_train.c -o simple_train -lfann -lm
    gcc -O3 steepness_train.c -o steepness_train -lfann -lm
    gcc -O3 simple_test.c -o simple_test -lfann -lm
    gcc -O3 robot.c -o robot -lfann -lm
    gcc -O3 mushroom.c -o mushroom -lfann -lm
    gcc -O3 cascade_train.c -o cascade_train -lfann -lm
    gcc -O3 scaling_test.c -o scaling_test -lfann -lm
    gcc -O3 scaling_train.c -o scaling_train -lfann -lm

    Training network
    ./xor_train
    Creating network.
    Training network.
    Max epochs 1000. Desired error: 0.0000000000.
    Epochs 1. Current error: 0.2998471856. Bit fail 4.
    Epochs 10. Current error: 0.1645403504. Bit fail 4.
    Epochs 20. Current error: 0.1343973279. Bit fail 4.
    Epochs 30. Current error: 0.1321901083. Bit fail 4.
    Epochs 40. Current error: 0.1320076436. Bit fail 4.
    Epochs 50. Current error: 0.1318376809. Bit fail 4.
    Epochs 60. Current error: 0.1316868365. Bit fail 4.
    Epochs 70. Current error: 0.1314437091. Bit fail 4.
    Epochs 80. Current error: 0.1314807087. Bit fail 4.
    Epochs 90. Current error: 0.1314186156. Bit fail 4.
    Epochs 100. Current error: 0.1313483715. Bit fail 4.
    Epochs 110. Current error: 0.1314515471. Bit fail 4.
    Epochs 120. Current error: 0.1313693523. Bit fail 4.
    Epochs 130. Current error: 0.1314102709. Bit fail 4.
    Epochs 140. Current error: 0.1313417256. Bit fail 4.
    Epochs 150. Current error: 0.1313553154. Bit fail 4.
    Epochs 160. Current error: 0.1313396096. Bit fail 4.
    Epochs 170. Current error: 0.1313699782. Bit fail 4.
    Epochs 180. Current error: 0.1313713491. Bit fail 4.
    Epochs 190. Current error: 0.1313034594. Bit fail 4.
    Epochs 200. Current error: 0.1313286722. Bit fail 4.
    Epochs 210. Current error: 0.1313354671. Bit fail 4.
    Epochs 220. Current error: 0.1313285679. Bit fail 4.
    Epochs 230. Current error: 0.1312805712. Bit fail 4.
    Epochs 240. Current error: 0.1312561035. Bit fail 4.
    Epochs 250. Current error: 0.1312738359. Bit fail 4.
    Epochs 260. Current error: 0.1312966943. Bit fail 4.
    Epochs 270. Current error: 0.1312941313. Bit fail 4.
    Epochs 280. Current error: 0.1312871873. Bit fail 4.
    Epochs 290. Current error: 0.1312831491. Bit fail 4.
    Epochs 300. Current error: 0.1312471628. Bit fail 4.
    Epochs 310. Current error: 0.1312719584. Bit fail 4.
    Epochs 320. Current error: 0.1312411875. Bit fail 4.
    Epochs 330. Current error: 0.1312507540. Bit fail 4.
    Epochs 340. Current error: 0.1312562227. Bit fail 4.
    Epochs 350. Current error: 0.1312428415. Bit fail 4.
    Epochs 360. Current error: 0.1312461942. Bit fail 4.
    Epochs 370. Current error: 0.1312564313. Bit fail 4.
    Epochs 380. Current error: 0.1312440932. Bit fail 4.
    Epochs 390. Current error: 0.1312446594. Bit fail 4.
    Epochs 400. Current error: 0.1312422752. Bit fail 4.
    Epochs 410. Current error: 0.1312395483. Bit fail 4.
    Epochs 420. Current error: 0.1312251985. Bit fail 4.
    Epochs 430. Current error: 0.1311910152. Bit fail 4.
    Epochs 440. Current error: 0.1311998963. Bit fail 4.
    Epochs 450. Current error: 0.1312367022. Bit fail 4.
    Epochs 460. Current error: 0.1312312782. Bit fail 4.
    Epochs 470. Current error: 0.1312316060. Bit fail 4.
    Epochs 480. Current error: 0.1312264204. Bit fail 4.
    Epochs 490. Current error: 0.1312348247. Bit fail 4.
    Epochs 500. Current error: 0.1311919093. Bit fail 4.
    Epochs 510. Current error: 0.1312199533. Bit fail 4.
    Epochs 520. Current error: 0.1312156916. Bit fail 4.
    Epochs 530. Current error: 0.1312299967. Bit fail 4.
    Epochs 540. Current error: 0.1312159747. Bit fail 4.
    Epochs 550. Current error: 0.1312028170. Bit fail 4.
    Epochs 560. Current error: 0.1311953217. Bit fail 4.
    Epochs 570. Current error: 0.1312059760. Bit fail 4.
    Epochs 580. Current error: 0.1312075257. Bit fail 4.
    Epochs 590. Current error: 0.1312050819. Bit fail 4.
    Epochs 600. Current error: 0.1312092394. Bit fail 4.
    Epochs 610. Current error: 0.1311953366. Bit fail 4.
    Epochs 620. Current error: 0.1312166899. Bit fail 4.
    Epochs 630. Current error: 0.1312093884. Bit fail 4.
    Epochs 640. Current error: 0.1312118769. Bit fail 4.
    Epochs 650. Current error: 0.1312177479. Bit fail 4.
    Epochs 660. Current error: 0.1311965585. Bit fail 4.
    Epochs 670. Current error: 0.1311824322. Bit fail 4.
    Epochs 680. Current error: 0.1311974674. Bit fail 4.
    Epochs 690. Current error: 0.1311904341. Bit fail 4.
    Epochs 700. Current error: 0.1312078834. Bit fail 4.
    Epochs 710. Current error: 0.1312024593. Bit fail 4.
    Epochs 720. Current error: 0.1312027872. Bit fail 4.
    Epochs 730. Current error: 0.1312017739. Bit fail 4.
    Epochs 740. Current error: 0.1312023550. Bit fail 4.
    Epochs 750. Current error: 0.1311884224. Bit fail 4.
    Epochs 760. Current error: 0.1311852485. Bit fail 4.
    Epochs 770. Current error: 0.1312024593. Bit fail 4.
    Epochs 780. Current error: 0.1311842203. Bit fail 4.
    Epochs 790. Current error: 0.1311897635. Bit fail 4.
    Epochs 800. Current error: 0.1311981380. Bit fail 4.
    Epochs 810. Current error: 0.1311885417. Bit fail 4.
    Epochs 820. Current error: 0.1311869621. Bit fail 4.
    Epochs 830. Current error: 0.1311998963. Bit fail 4.
    Epochs 840. Current error: 0.1312031895. Bit fail 4.
    Epochs 850. Current error: 0.1311789453. Bit fail 4.
    Epochs 860. Current error: 0.1311890185. Bit fail 4.
    Epochs 870. Current error: 0.1311903894. Bit fail 4.
    Epochs 880. Current error: 0.1311752647. Bit fail 4.
    Epochs 890. Current error: 0.1311975718. Bit fail 4.
    Epochs 900. Current error: 0.1312029064. Bit fail 4.
    Epochs 910. Current error: 0.1311938316. Bit fail 4.
    Epochs 920. Current error: 0.1311802417. Bit fail 4.
    Epochs 930. Current error: 0.1311967373. Bit fail 4.
    Epochs 940. Current error: 0.1311729103. Bit fail 4.
    Epochs 950. Current error: 0.1311972737. Bit fail 4.
    Epochs 960. Current error: 0.1311960965. Bit fail 4.
    Epochs 970. Current error: 0.1312002838. Bit fail 4.
    Epochs 980. Current error: 0.1312011927. Bit fail 4.
    Epochs 990. Current error: 0.1311844289. Bit fail 4.
    Epochs 1000. Current error: 0.1312025189. Bit fail 4.
    Testing network. 0.131195
    XOR test (-1.000000,-1.000000) -> -0.845081, should be -1.000000, difference=0.154919
    XOR test (-1.000000,1.000000) -> -0.012242, should be 1.000000, difference=1.012242
    XOR test (1.000000,-1.000000) -> 0.843651, should be 1.000000, difference=0.156349
    XOR test (1.000000,1.000000) -> 0.012936, should be -1.000000, difference=1.012936
    Saving network.
    Cleaning up.

    Testing network with floats
    ./xor_test
    Creating network.
    Layer / Neuron 0123456
    L 1 / N 3 Abb….
    L 1 / N 4 ACC….
    L 1 / N 5 ACC….
    L 1 / N 6 …….
    L 2 / N 7 …FECa
    L 2 / N 8 …….
    Input layer : 2 neurons, 1 bias
    Hidden layer : 3 neurons, 1 bias
    Output layer : 1 neurons
    Total neurons and biases : 8
    Total connections : 13
    Connection rate : 1.000
    Network type : FANN_NETTYPE_LAYER
    Training algorithm : FANN_TRAIN_RPROP
    Training error function : FANN_ERRORFUNC_TANH
    Training stop function : FANN_STOPFUNC_BIT
    Bit fail limit : 0.010
    Learning rate : 0.700
    Learning momentum : 0.000
    Quickprop decay : -0.000100
    Quickprop mu : 1.750
    RPROP increase factor : 1.200
    RPROP decrease factor : 0.500
    RPROP delta min : 0.000
    RPROP delta max : 50.000
    Cascade output change fraction : 0.010000
    Cascade candidate change fraction : 0.010000
    Cascade output stagnation epochs : 12
    Cascade candidate stagnation epochs : 12
    Cascade max output epochs : 150
    Cascade min output epochs : 50
    Cascade max candidate epochs : 150
    Cascade min candidate epochs : 50
    Cascade weight multiplier : 0.400
    Cascade candidate limit :1000.000
    Cascade activation functions[0] : FANN_SIGMOID
    Cascade activation functions[1] : FANN_SIGMOID_SYMMETRIC
    Cascade activation functions[2] : FANN_GAUSSIAN
    Cascade activation functions[3] : FANN_GAUSSIAN_SYMMETRIC
    Cascade activation functions[4] : FANN_ELLIOT
    Cascade activation functions[5] : FANN_ELLIOT_SYMMETRIC
    Cascade activation functions[6] : FANN_SIN_SYMMETRIC
    Cascade activation functions[7] : FANN_COS_SYMMETRIC
    Cascade activation functions[8] : FANN_SIN
    Cascade activation functions[9] : FANN_COS
    Cascade activation steepnesses[0] : 0.250
    Cascade activation steepnesses[1] : 0.500
    Cascade activation steepnesses[2] : 0.750
    Cascade activation steepnesses[3] : 1.000
    Cascade candidate groups : 2
    Cascade no. of candidates : 80
    Testing network.
    XOR test (-1.000000, -1.000000) -> -0.845081, should be -1.000000, difference=0.154919
    XOR test (-1.000000, 1.000000) -> -0.012242, should be 1.000000, difference=1.012242
    XOR test (1.000000, -1.000000) -> 0.843651, should be 1.000000, difference=0.156349
    XOR test (1.000000, 1.000000) -> 0.012936, should be -1.000000, difference=1.012936
    Cleaning up.

    Testing network with fixed points
    ./xor_test_fixed
    Creating network.
    Layer / Neuron 0123456
    L 1 / N 3 Abb….
    L 1 / N 4 ACC….
    L 1 / N 5 ACC….
    L 1 / N 6 …….
    L 2 / N 7 …FECa
    L 2 / N 8 …….
    Input layer : 2 neurons, 1 bias
    Hidden layer : 3 neurons, 1 bias
    Output layer : 1 neurons
    Total neurons and biases : 8
    Total connections : 13
    Connection rate : 1.000
    Network type : FANN_NETTYPE_LAYER
    Decimal point : 13
    Multiplier :8192
    Bit fail limit : 82
    Testing network.
    XOR test (-8192, -8192) -> -6287, should be -8192, difference=0.232544
    Test failed
    XOR test (-8192, 8192) -> -122, should be 8192, difference=1.014893
    Test failed
    XOR test (8192, -8192) -> 6037, should be 8192, difference=0.263062
    Test failed
    XOR test (8192, 8192) -> -122, should be -8192, difference=0.985107
    Test failed
    Cleaning up.
    make: *** [runtest] Error 255
    bhupendra@vpn examples$

    • Bhupendra Bhupendra
      March 15, 2013    

      Got it!!! :)
      Posting it for anyone having same issue on Mac. 😛
      For OSX you need to change optimization to ‘0’ instead of ‘3’. Just change these two lines in the ./example/Makefile
      >>
      %: %.c Makefile
      $(GCC) -O0 $< -o $@ -lfann -lm

      %_fixed: %.c Makefile
      $(GCC) -O0 -DFIXEDFANN $>

      Output of the testrun:
      bhupendra@vpn examples$ make runtest
      gcc -O0 xor_train.c -o xor_train -lfann -lm
      gcc -O0 xor_test.c -o xor_test -lfann -lm
      gcc -O0 -DFIXEDFANN xor_test.c -o xor_test_fixed -lfixedfann -lm
      gcc -O0 simple_train.c -o simple_train -lfann -lm
      gcc -O0 steepness_train.c -o steepness_train -lfann -lm
      gcc -O0 simple_test.c -o simple_test -lfann -lm
      gcc -O0 robot.c -o robot -lfann -lm
      gcc -O0 mushroom.c -o mushroom -lfann -lm
      gcc -O0 cascade_train.c -o cascade_train -lfann -lm
      gcc -O0 scaling_test.c -o scaling_test -lfann -lm
      gcc -O0 scaling_train.c -o scaling_train -lfann -lm

      Training network
      ./xor_train
      Creating network.
      Training network.
      Max epochs 1000. Desired error: 0.0000000000.
      Epochs 1. Current error: 0.2865722179. Bit fail 4.
      Epochs 10. Current error: 0.1378555745. Bit fail 4.
      Epochs 20. Current error: 0.0009042433. Bit fail 4.
      Epochs 28. Current error: 0.0000391395. Bit fail 0.
      Testing network. 0.000023
      XOR test (-1.000000,-1.000000) -> -0.991215, should be -1.000000, difference=0.008785
      XOR test (-1.000000,1.000000) -> 0.988305, should be 1.000000, difference=0.011695
      XOR test (1.000000,-1.000000) -> 0.991032, should be 1.000000, difference=0.008968
      XOR test (1.000000,1.000000) -> -0.991266, should be -1.000000, difference=0.008734
      Saving network.
      Cleaning up.

      Testing network with floats
      ./xor_test
      Creating network.
      Layer / Neuron 0123456
      L 1 / N 3 CCB….
      L 1 / N 4 CCC….
      L 1 / N 5 BBb….
      L 1 / N 6 …….
      L 2 / N 7 …BCdd
      L 2 / N 8 …….
      Input layer : 2 neurons, 1 bias
      Hidden layer : 3 neurons, 1 bias
      Output layer : 1 neurons
      Total neurons and biases : 8
      Total connections : 13
      Connection rate : 1.000
      Network type : FANN_NETTYPE_LAYER
      Training algorithm : FANN_TRAIN_RPROP
      Training error function : FANN_ERRORFUNC_TANH
      Training stop function : FANN_STOPFUNC_BIT
      Bit fail limit : 0.010
      Learning rate : 0.700
      Learning momentum : 0.000
      Quickprop decay : -0.000100
      Quickprop mu : 1.750
      RPROP increase factor : 1.200
      RPROP decrease factor : 0.500
      RPROP delta min : 0.000
      RPROP delta max : 50.000
      Cascade output change fraction : 0.010000
      Cascade candidate change fraction : 0.010000
      Cascade output stagnation epochs : 12
      Cascade candidate stagnation epochs : 12
      Cascade max output epochs : 150
      Cascade min output epochs : 50
      Cascade max candidate epochs : 150
      Cascade min candidate epochs : 50
      Cascade weight multiplier : 0.400
      Cascade candidate limit :1000.000
      Cascade activation functions[0] : FANN_SIGMOID
      Cascade activation functions[1] : FANN_SIGMOID_SYMMETRIC
      Cascade activation functions[2] : FANN_GAUSSIAN
      Cascade activation functions[3] : FANN_GAUSSIAN_SYMMETRIC
      Cascade activation functions[4] : FANN_ELLIOT
      Cascade activation functions[5] : FANN_ELLIOT_SYMMETRIC
      Cascade activation functions[6] : FANN_SIN_SYMMETRIC
      Cascade activation functions[7] : FANN_COS_SYMMETRIC
      Cascade activation functions[8] : FANN_SIN
      Cascade activation functions[9] : FANN_COS
      Cascade activation steepnesses[0] : 0.250
      Cascade activation steepnesses[1] : 0.500
      Cascade activation steepnesses[2] : 0.750
      Cascade activation steepnesses[3] : 1.000
      Cascade candidate groups : 2
      Cascade no. of candidates : 80
      Testing network.
      XOR test (-1.000000, -1.000000) -> -0.991215, should be -1.000000, difference=0.008785
      XOR test (-1.000000, 1.000000) -> 0.988305, should be 1.000000, difference=0.011695
      XOR test (1.000000, -1.000000) -> 0.991032, should be 1.000000, difference=0.008968
      XOR test (1.000000, 1.000000) -> -0.991266, should be -1.000000, difference=0.008734
      Cleaning up.

      Testing network with fixed points
      ./xor_test_fixed
      Creating network.
      Layer / Neuron 0123456
      L 1 / N 3 CCB….
      L 1 / N 4 CCC….
      L 1 / N 5 BBb….
      L 1 / N 6 …….
      L 2 / N 7 …BCdd
      L 2 / N 8 …….
      Input layer : 2 neurons, 1 bias
      Hidden layer : 3 neurons, 1 bias
      Output layer : 1 neurons
      Total neurons and biases : 8
      Total connections : 13
      Connection rate : 1.000
      Network type : FANN_NETTYPE_LAYER
      Decimal point : 13
      Multiplier :8192
      Bit fail limit : 82
      Testing network.
      XOR test (-8192, -8192) -> -8192, should be -8192, difference=0.000000
      XOR test (-8192, 8192) -> 7888, should be 8192, difference=0.037109
      XOR test (8192, -8192) -> 7967, should be 8192, difference=0.027466
      XOR test (8192, 8192) -> -8192, should be -8192, difference=0.000000
      Cleaning up.
      bhupendra@vpn examples$

  10. February 24, 2014    

    Hello,
    Im using FANN on my Ubuntu. I have installed it very easily but testrun is failed.
    Console output follows:

    root@Pear-TOSHIBA-NB500:/home/ocastell/Baixades/FANN-2.2.0-Source/examples# make runtest

    Training network
    ./xor_train
    Creating network.
    ./xor_train: symbol lookup error: /usr/local/lib/libfann.so.2: undefined symbol: pow
    make: *** [runtest] Error 127
    root@Pear-TOSHIBA-NB500:/home/ocastell/Baixades/FANN-2.2.0-Source/examples#

    • Mohafiz Khan Mohafiz Khan
      March 31, 2015    

      Thats the problem caused during dynamic linking… Instead use static linking.
      Just use command gcc -lfann -lm -static.

  11. naj naj
    April 23, 2014    

    When i tried to make runtest in Examples directory I got:libfann.so undefined reference to sqrt, sin, log, cos, floor, pow !!!!!!! please help

  12. April 27, 2014    

    “The CXX compiler identification is unknown” error.

    I’m using Ubuntu 14.04LTS.
    I downloaded the package, unzipped into a folder under /home//AI
    I then opened a terminal window, cd’d to ~/AI/FANN-2.2.0-Source
    Ran “cmake .”
    Got the following:

    ct@Magister:~/AI/FANN-2.2.0-Source$ cmake .
    — The C compiler identification is GNU 4.8.2
    — The CXX compiler identification is unknown
    — Check for working C compiler: /usr/bin/cc
    — Check for working C compiler: /usr/bin/cc — works
    — Detecting C compiler ABI info
    — Detecting C compiler ABI info – done
    CMake Error: your CXX compiler: “CMAKE_CXX_COMPILER-NOTFOUND” was not found. Please set CMAKE_CXX_COMPILER to a valid compiler path or name.
    — FANN is used as APPLICATION_NAME
    — Configuring incomplete, errors occurred!
    See also “/home/ct/AI/FANN-2.2.0-Source/CMakeFiles/CMakeOutput.log”.
    See also “/home/ct/AI/FANN-2.2.0-Source/CMakeFiles/CMakeError.log”.

    Obviously the relevant log files are all greek to me…

    Can anyone help with this?

  13. mckenzie mckenzie
    November 27, 2014    

    Hi Fann Team! I have a problem relevant to installing fann in ubuntu mate 14.04 . firstly I have checked ” cmake . ” its OK. no problem. but I have took a ” 1 error” when I run “sudo make install ” command. This Error is including below statement:

    ” CMake Error at src/include/cmake_install.cmake:36 (FILE):
    file INSTALL cannot find
    “/home/mckenzie34/Program_files/fann-code/src/include/compat_time.h”.
    Call Stack (most recent call first):
    src/cmake_install.cmake:197 (INCLUDE)
    cmake_install.cmake:41 (INCLUDE)

    How to solve its problem?? please help me guyss!! also thanks for your interest. Best regards.

  14. Rene CM Rene CM
    March 10, 2015    

    Hi all,

    I’ve been trying to include the source c files in a Visual C++ project and compile them however I’m getting some errors like some functions using “FANN_EXTERNAL” can not be defined there or something like that, also I tried to add as a reference the dll’s files provided but VS doesn’t let me to add them, it says that those files are not a valid dll or com object.

    So I would like to know how can I compile the library in such a way that I can use it from a VS C++ or C# project, by the way, I’m using VS 2005. Should I create the dll files first?
    I also tried to do that but I got so many errors when I created the Win32 project and included the .h and .c files and tried to build it.
    I would thank any hint any one can give me about his.

    Thanks,

  15. Marcos Marcos
    October 7, 2015    

    one of the developers could do us the favor of publishing a video which shows each of the different installations

  16. NNfan NNfan
    November 17, 2015    

    Has anyone used FANN in Visual C++? If yes, please help me with the guidelines to install and use it.

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