Question regarding bit allocation

[Ali-Flt]

Hi,

In your paper you mention that you allocated 2, 3, or 4 bits to each layer of the model using a criteria. But in Fig. 1(d): Construct LUT and Query&Add, the binary weights are shown to be 8-bit. This has confused me a bit. Is the figure created with 8-bit weights in mind instead of <= 4 bit weights? Or am I misunderstanding the flow?

Another way I tried to interpret Fig. 1 is that the FP16 Shift and Query&Add blocks have to run once for every bit of W. For instance, if we have allocated 3 bits to a weight W, the ShiftAddLLM block runs 3 times, each time for one bit of the W. In this interpretation, each bit in the 8-bit binary weights in Fig. 1(d) correspond to one of the activation (x) values.

Could you please elaborate more on how the bit allocation maps to the ShiftAddLLM architecture?

[xlim1997]

Hi,
Could you find the code how they use this shift&add during inference?
I could only find that they unpacked the alpha and binary weight back to FP16 format, which is contradicting the methodology as shown in figure 1.

Best regards,
Lucas