GitLab

- removing 'Cache' class, replaced by 'Randomizer'
- removing obsolete training tools using 'Cache' class
- adding 2d convolutional components from Harish
- removing scaled inv-prior-weighted cross-entropy Class, not helpful




git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@3551 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8