This repository contains several different dynamic low-bit quantizations of Qwen 3.5-2B. These quantizations were created with the RCOL (RCO - lite) algorithm, which is an experimental approximation version of ISTALab's RCO method. The principles of the algorithm can be found below. RCO‑lite (RCOL) A cheap stand‑in for RCO, the outer type‑allocation loop of ISTA's GSQ+RCO quantizer. RCO picks one GGUF quant type per tensor (Q4K, IQ3S, …) so the whole model minimizes end‑to‑end KL divergence from a BF16 teacher under an exact size budget - same target as traditional RCO. Full RCO does this with Gumbel‑STE and a Riemannian budget‑manifold search; RCO‑lite makes the absolute best approximation…