identify the speaker while the negatives that are across the same waveform within the same speaker that you let's you learn like more fine-grained phoneme features which are useful for like phoneme classification so depending on the downstream task the kind of negatives you pick are going to be crucial so here's basically CPC at a high level the diagram is very very very clear you're just basically gonna try to do this across various audio waveforms various different numbers of time steps you should be very careful in picking