Is the condition for the 'mono' function correct?

[Henglin-Liu]

audiotools/audiotools/data/datasets.py

Lines 116 to 117 in 7776c29

	if num_channels == 1:
	signal = signal.to_mono()

I see mono is to get the mean value across different channels，why we do this when the channel num_channels is 1? Is there any reasons?

[listener17]

@yuioqp do you know how to read in a stereo audio dataset?