Test on AISHELL-4 dataset

[RamakrishnaChaitanya]

Thanks for the amazing work.

I'm trying to reproduce the results on the AISHELL-4 test dataset. I could only see the single set of transcriptions and the 8-channel WAV files in the AI SHELL 4 Test corpus. So, wondering which channel you could have used along with the transcriptions while deriving the AUCROC scores.