I’ve just installed your gem and played around with it:

require ‘rubygems’
require ‘lda-ruby’

corpus = Lda::TextCorpus.new(“wiki.yml”) #your wiki.yml sample from githum
lda = Lda::Lda.new(corpus)
lda.em(“random”)
lda.print_topics(20)

I am still getting mem-errors:
**** em iteration 18 ****
document 0
alpha maximization : -4287345.78872 -43327.81103
alpha maximization : -1548702.32296 -43323.21111
alpha maximization : -541382.27277 -43310.57142
alpha maximization : -170984.67685 -43275.21738
alpha maximization : -34908.82190 -43172.08169
alpha maximization : 14938.21277 -42849.82881
alpha maximization : 33017.35118 -41815.29136
alpha maximization : 39371.99323 -38767.30725
alpha maximization : 41421.31191 -31264.63627
alpha maximization : 41950.37711 -17795.42690
alpha maximization : 42029.01551 -4632.65941
alpha maximization : 42032.30393 -256.10453
alpha maximization : 42032.31270 -0.73255
alpha maximization : 42032.31270 -0.00001
new alpha = 0.01187
*** glibc detected *** ruby: double free or corruption (!prev): 0x085f9938 ***
======= Backtrace: =========
/lib/i686/cmov/libc.so.6[0xb7e2b764]
/lib/i686/cmov/libc.so.6(cfree+0×96)[0xb7e2d966]
/usr/local/lib/ruby/gems/1.8/gems/ealdent-lda-ruby-0.3.1/lib/lda-ruby/lda.so(free_lda_suffstats+0x4a)[0xb793b55f]
/usr/local/lib/ruby/gems/1.8/gems/ealdent-lda-ruby-0.3.1/lib/lda-ruby/lda.so(run_quiet_em+0x60b)[0xb793dfe1]
/usr/local/lib/ruby/gems/1.8/gems/ealdent-lda-ruby-0.3.1/lib/lda-ruby/lda.so[0xb793e4c8]
ruby[0x805fbd2]
ruby[0x8060891]
ruby[0x805e024]
ruby[0x806b24e]
ruby(ruby_exec+0×16)[0x806b286]
ruby(ruby_run+0×21)[0x806b2b1]
ruby[0x805363f]
/lib/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7dd3455]
ruby[0x8053571]
======= Memory map: ========
08048000-080fe000 r-xp 00000000 08:03 16942342 /usr/local/bin/ruby
080fe000-080ff000 rw-p 000b6000 08:03 16942342 /usr/local/bin/ruby
080ff000-08862000 rw-p 080ff000 00:00 0 [heap]
b7800000-b7821000 rw-p b7800000 00:00 0
b7821000-b7900000 —p b7821000 00:00 0
b791f000-b792b000 r-xp 00000000 08:03 5729301 /lib/libgcc_s.so.1
b792b000-b792c000 rw-p 0000b000 08:03 5729301 /lib/libgcc_s.so.1
b7939000-b7941000 r-xp 00000000 08:03 17928557 /usr/local/lib/ruby/gems/1.8/gems/ealdent-lda-ruby-0.3.1/lib/lda-ruby/lda.so
b7941000-b7942000 rw-p 00007000 08:03 17928557 /usr/local/lib/ruby/gems/1.8/gems/ealdent-lda-ruby-0.3.1/lib/lda-ruby/lda.so
b7942000-b7cff000 rw-p b7942000 00:00 0
b7cff000-b7d18000 r-xp 00000000 08:03 16977996 /usr/local/lib/ruby/1.8/i686-linux/syck.so
b7d18000-b7d19000 rw-p 00019000 08:03 16977996 /usr/local/lib/ruby/1.8/i686-linux/syck.so
b7d19000-b7da4000 rw-p b7d19000 00:00 0
b7da4000-b7db9000 r-xp 00000000 08:03 5755525 /lib/i686/cmov/libpthread-2.7.so
b7db9000-b7dbb000 rw-p 00014000 08:03 5755525 /lib/i686/cmov/libpthread-2.7.so
b7dbb000-b7dbd000 rw-p b7dbb000 00:00 0
b7dbd000-b7f12000 r-xp 00000000 08:03 5755533 /lib/i686/cmov/libc-2.7.so
b7f12000-b7f13000 r–p 00155000 08:03 5755533 /lib/i686/cmov/libc-2.7.so
b7f13000-b7f15000 rw-p 00156000 08:03 5755533 /lib/i686/cmov/libc-2.7.so
b7f15000-b7f18000 rw-p b7f15000 00:00 0
b7f18000-b7f3c000 r-xp 00000000 08:03 5755523 /lib/i686/cmov/libm-2.7.so
b7f3c000-b7f3e000 rw-p 00023000 08:03 5755523 /lib/i686/cmov/libm-2.7.so
b7f3e000-b7f47000 r-xp 00000000 08:03 5755524 /lib/i686/cmov/libcrypt-2.7.so
b7f47000-b7f49000 rw-p 00008000 08:03 5755524 /lib/i686/cmov/libcrypt-2.7.so
b7f49000-b7f71000 rw-p b7f49000 00:00 0
b7f71000-b7f73000 r-xp 00000000 08:03 5755527 /lib/i686/cmov/libdl-2.7.so
b7f73000-b7f75000 rw-p 00001000 08:03 5755527 /lib/i686/cmov/libdl-2.7.so
b7f75000-b7f7c000 r-xp 00000000 08:03 5755538 /lib/i686/cmov/librt-2.7.so
b7f7c000-b7f7e000 rw-p 00006000 08:03 5755538 /lib/i686/cmov/librt-2.7.so
b7f7e000-b7f7f000 rw-p b7f7e000 00:00 0
b7f7f000-b7f83000 r-xp 00000000 08:03 16977998 /usr/local/lib/ruby/1.8/i686-linux/stringio.so
b7f83000-b7f84000 rw-p 00003000 08:03 16977998 /usr/local/lib/ruby/1.8/i686-linux/stringio.so
b7f84000-b7f86000 r-xp 00000000 08:03 16978006 /usr/local/lib/ruby/1.8/i686-linux/etc.so
b7f86000-b7f87000 rw-p 00001000 08:03 16978006 /usr/local/lib/ruby/1.8/i686-linux/etc.so
b7f87000-b7f8a000 r-xp 00000000 08:03 16978002 /usr/local/lib/ruby/1.8/i686-linux/thread.so
b7f8a000-b7f8b000 rw-p 00002000 08:03 16978002 /usr/local/lib/ruby/1.8/i686-linux/thread.so
b7f8b000-b7f8d000 rw-p b7f8b000 00:00 0
b7f8d000-b7f8e000 r-xp b7f8d000 00:00 0 [vdso]
b7f8e000-b7fa8000 r-xp 00000000 08:03 5732794 /lib/ld-2.7.so
b7fa8000-b7faa000 rw-p 0001a000 08:03 5732794 /lib/ld-2.7.so
bfbd1000-bfbe6000 rw-p bfbd1000 00:00 0 [stack]