Seeking Clarification on DemucsStreamer Logic

[sreezilosky]

Team, I want to express my immense gratitude for open sourcing your project. Your contribution has been a career-saving resource for me, and words cannot convey how thankful I am.

I've been delving into the DemucsStreamer logic, and while I've made progress, certain aspects, especially related to the decoder streaming, still elude me. Specifically, I'm seeking clarification on a few lines of code:

1. Subtracting Bias (Line 403):
   I'm curious about the motivation behind subtracting the bias in this line. Could you kindly explain the rationale behind this operation?

2. Operations: x = x[..., :-demucs.stride] and x[..., :demucs.stride] += prev:
   I'm struggling to grasp the purpose of these operations. Why do we modify x using these slices, and what role do they play in the overall functionality of the code?

I've been trying to understand these nuances for months, and any insights or explanations would be immensely valuable to me.
If at all there is an explanation for this somewhere in the web, kindly help me with the link.

[sreezilosky]

@adiyoss @adefossez I've tried to figure this for few months now - but i failed. Would be really helpful if some direction to this is given. Thanks in advance.