Output .ctm of Speech Data Simulator has channel and spk_id swapped 
https://github.com/NVIDIA/NeMo/blob/2cc09425aba3e9b3cfdba43a3188eaef58227055/nemo/collections/asr/data/data_simulation.py#L1057

But according to https://web.archive.org/web/20170119114252/http://www.itl.nist.gov/iad/mig/tests/rt/2009/docs/rt09-meeting-eval-plan-v2.pdf it should be: 

```
<SOURCE><SP><CHANNEL><SP> <BEG-TIME><SP><DURATION><SP><TOKEN><SP>
<CONF><SP><TYPE><SP><SPEAKER><NEWLINE>
```