Fixes to chain and relevant nnet3 python scripts to support python3.x#2629

danpovey merged 3 commits intokaldi-asr:masterkaldi-asr/kaldi:masterfrom

akshayc11:Python3x-fixes-for-chain-and-nnet3akshayc11/kaldi:Python3x-fixes-for-chain-and-nnet3Copy head branch name to clipboard