arXiv AI By Rhea Sanjay Sukthanker, Pashmina Cameron

ThinkBit: Search Codewords, Recalibrate Scales, Select by Reasoning

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ThinkBit is a two‑bit scalar quantization framework designed to preserve reasoning capabilities in language models. It assigns each layer a ternary, 2‑bit, or 3‑bit tier based on sensitivity, then uses a Gumbel‑softmax search to find optimal codewords block‑by‑block. After freezing codewords, it recalibrates shared scales via knowledge‑distillation and performs a brief quantization‑aware training, finally selecting the best checkpoint with paired reasoning tests.

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