support UTF-8 start_text

[maraoz]

I was trying to run stuff like:

th sample.lua -checkpoint $(ls -t cv/check*.t7 | head -1) -length 200 -temperature 0.75 -start_text "El país necesita"

And kept getting a Got invalid idx error. After digging a while I found that lua doesn't work correctly with utf-8 strings 😠, so I had to add a package to solve this.

Please review. This PR might be controversial, as it adds a dependency, but I think that given that the main use-case for this lib is character-based learning, it should properly handle UTF-8 inputs both in the input files (#7) and CLI arguments (this PR).

[ostrosablin]

Oh, that solves #47 issue I have started! Many thanks! Hope this gets merged into the main project, but for now I'm cloning your fork.

[jcjohnson]

Thanks for figuring this one out! It seems like a relatively innocent dependency, so I think I'm onboard. Does this require any change to the decode_string method in the LanguageModel? Will it still work properly if we sample a non-ASCII character?

[maraoz]

It does! Actually, that worked even without this PR

On Thu, Mar 31, 2016, 14:22 Justin notifications@github.com wrote:

Thanks for figuring this one out! It seems like a relatively innocent
dependency, so I think I'm onboard. Does this require any change to the
decode_string method in the LanguageModel? Will it still work properly if
we sample a non-ASCII character?

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#52 (comment)

[drcege]

Why this comment has not been merged?

[mcr-ksh]

did the same. works but the Problem with "132: Got invalid idx" remains as the index is not found due to a bad preprocessing for the voc_table. However, I managed to get this fixed by #29