How to gather training data for simple voice commands?
What would librosa generate? If the sound clips it gives you aren't also words then I would worry about the effectiveness of the training. It'd be better to record samples of yourself saying the positive labelled words and saying a bunch of other words to use as negative labels. I recognize this is likely to be an irritating process; one approach I have read of in the past to maximise the use of small amounts of training data is to use transformations and distortions on training data to increase the effective number of samples. In this case, the training data were pictures of animals. Effectively what the researchers did was tweak the images slightly; they rotated the images various degrees, squeezed them (by lowering the height or width and not retaining aspect ratio) or stretched them and so on. You might be able to do the same;  record a smallish number of samples and then use distortions to raise the effective number of samples to a useful number.