pub fn dequant_q2_k(src: &[u8]) -> Result<Vec<f32>, QuantError>Expand description
Dequantize a Q2_K buffer into f32. Formula verified against real
ggml-quants.c::dequantize_row_q2_K: 16 sub-blocks of 16 elements,
each sub-block’s (scale, min) packed one byte per sub-block
(sc & 0xF = 4-bit scale, sc >> 4 = 4-bit min – much simpler
than Q4_K’s cross-byte 6-bit packing), value = d*scale*raw2bit - dmin*min, raw2bit in 0..=3 (2 bits per element from qs, 4
elements packed per byte).