ruby-fann gem doesn't work on 3.2.0/Ubuntu 22.04

[jcasu]

I believe I have a clean fann and ruby-fann install.
But for some reason, the test program which I copied from this site crashes as below.

rubyai@enterprise:~/d.ruby.stuff$ apt list | fgrep fann | fgrep installed

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libfann-dev/jammy,now 2.2.0+ds-6 amd64 [installed]
libfann-doc/jammy,jammy,now 2.2.0+ds-6 all [installed]
libfann2/jammy,now 2.2.0+ds-6 amd64 [installed,automatic]

rubyai@enterprise:~/d.ruby.stuff$ ruby --version
ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux]

rubyai@enterprise:~/d.ruby.stuff$ gem pristine ruby-fann
Restoring gems to pristine condition...
Building native extensions. This could take a while...
Restored ruby-fann-1.3.2

rubyai@enterprise:~/d.ruby.stuff$ more test2.rb
require 'ruby-fann'
train = RubyFann::TrainData.new(:inputs=>[[0.3, 0.4, 0.5], [0.1, 0.2, 0.3]], :desired_outputs=>[[0.7], [0.8]])
fann = RubyFann::Standard.new(:num_inputs=>3, :hidden_neurons=>[2, 8, 4, 3, 4], :num_outputs=>1)
fann.train_on_data(train, 1000, 10, 0.1) # 1000 max_epochs, 10 errors between reports and 0.1 desired MSE (mean-squared-error)
outputs = fann.run([0.3, 0.2, 0.4])

rubyai@enterprise:~/d.ruby.stuff$ ruby test2.rb
internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:88:in require': cannot load such file -- ruby_fann/ruby_fann (LoadError) from <internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:88:in require'
from /home/rubyai/local/lib/ruby/gems/3.2.0/gems/ruby-fann-1.3.2/lib/ruby_fann.rb:2:in <top (required)>' from <internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:88:in require'
from internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:88:in require' from /home/rubyai/local/lib/ruby/gems/3.2.0/gems/ruby-fann-1.3.2/lib/ruby-fann.rb:1:in <top (required)>'
from internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:162:in require' from <internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:162:in rescue in require'
from internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:152:in require' from test2.rb:1:in

'
internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:88:in require': cannot load such file -- ruby-fann (LoadError) from <internal:/home/rubyai/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:88:in require'
from test2.rb:1:in `'

[EntropicBlackhole]

I also have practically the same problem, however I have Ruby 3.1.3 (on Windows 11)
To replicate:
-Run gem install ruby-fann in the working dir terminal
-Make a .rb file, and require 'ruby-fann', run it and you get this error:

<internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:88:in `require': cannot load such file -- ruby_fann/ruby_fann (LoadError)
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:88:in `require'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/ruby-fann-1.3.2/lib/ruby_fann.rb:2:in `<top (required)>'
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:88:in `require'
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:88:in `require'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/ruby-fann-1.3.2/lib/ruby-fann.rb:1:in `<top (required)>'
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:162:in `require'
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:162:in `rescue in require'
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:152:in `require'
        from neural-net.rb:1:in `<main>'
<internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:88:in `require': cannot load such file -- ruby-fann (LoadError)
        from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:88:in `require'
        from neural-net.rb:1:in `<main>'

I'm literally new to Ruby as I just installed it yesterday, and was following a guide, when running I run into this error, although my conclusion would be that perhaps the gem isn't compatible with the Ruby version? Not sure, again I'm on 3.1.3, any help would be appreciated!

[cmirnow]

Probably a similar problem with ruby 3.2 on openSUSE Tumbleweed. Any ideas?

[SergeySc]

Same issue here.
Ruby: 3.2.1

<internal:C:/Apps/Ruby32-x64/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:88:in `require': cannot load such file -- ruby_fann/ruby_fann (LoadError)

[19CVn]

I am Windows user and have same issue too.
I moved the "ruby-fann.rb" and "ruby_fann.rb" files from the "ruby-fann-1.3.2\lib" directory to "ruby-fann-1.3.2\lib\ruby_fann". Afterwards, I wrote like this

$LOAD_PATH.unshift("D:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/ruby-fann-1.3.2/lib/ruby_fann")
require 'ruby-fann'

Then I ran the training example provided on https://tangledpath.github.io/ruby-fann/index.html, and it worked without issue. Ruby was able to successfully load both files.

However, a new error has since arisen. The following information pertains to this error:

n.rb:3:in `<main>': uninitialized constant RubyFann::TrainData (NameError)

  train = RubyFann::TrainData.new(:inputs=>[[0.3, 0.4, 0.5], [0.1, 0.2, 0.3]], :desired_outputs=>[[0.7], [0.8]])

[ustuntas]

Hello,

The problem is still here for me. How can i fix it? Any help.
My ruby version is 3.2.1 the gem file version 1.3.2.

The error:
internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:85:in require': cannot load such file -- ruby_fann/ruby_fann (LoadError) from <internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:85:in require'
from /home/ustuntas/.gem/ruby/3.2.0/gems/ruby-fann-1.3.2/lib/ruby_fann.rb:2:in <top (required)>' from <internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:85:in require'
from internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:85:in require' from /home/ustuntas/.gem/ruby/3.2.0/gems/ruby-fann-1.3.2/lib/ruby-fann.rb:1:in <top (required)>'
from internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:159:in require' from <internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:159:in rescue in require'
from internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:39:in require' from tester.rb:1:in

'
internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:85:in require': cannot load such file -- ruby-fann (LoadError) from <internal:/home/ustuntas/.rbenv/versions/3.2.1/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:85:in require'
from tester.rb:1:in `'

[xhs345]

I encountered the same issue on Ruby 2.7 and Debian 11. So far I seem to have gotten it fixed while the following change: master...xhs345:ruby-fann:master

[git-steven]

Fixed