tedlium prepare.sh file should be updated

[AlexandderGorodetski]

Hello

There is following error during running prepare.sh of tedlium recipe

ValueError: It seems that 'sph2pipe' binary is not installed; did you run 'lhotse install-sph2pipe'?

The command 'lhotse install-sph2pipe' can be added at the beginning of prepare.sh file, I guess.

Thanks, AlexG.

[csukuangfj]

Would you mind creating a PR to fix it?

[luomingshuang]

It seems lhotse assumes that you have installed sph2pipe (when you install kaldi.). By the way, maybe we can use one command to check if the users install sph2pipe or not in prepare.sh .

[luomingshuang]

When I build the tedlium recipe, I install the kaldi firstly. So this error doesn't happen to me.