fix output paths for decoding results

[toruurakawa]

[ashutoshml]

Hi @toruurakawa

Thanks for sending in the pull request. I am not sure entirely if this wouldn't break or overwrite anything during the training and testing process.

I'll revisit and review these changes for any possible errors later since this doesn't result in any runtime error.

[toruurakawa]

Thanks for your comment.

Certainly it is necessary to make sure the behavior other than the decoding process. Okay, I would be grateful if you could check it when you have time.