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What this is: redux2 EDGE variant -- max abliteration preservation under 4 GB
Trial: Best Pareto trial from redux2 (50-trial Heretic + projection_pass_v2)
Quant scheme:
tier1 (8-bit affine, group 64) : mlp.down_proj on ALL 36 layers
(residual-stream writer, heavily modified
by projection_pass_v2)
tier2 (6-bit affine, group 64) : self_attn.o_proj on LATE layers (12-35) only
(the layers projection_pass_v2 actually
touched -- their weights drifted enough
from ternary to tolerate affine quant)
rest : 2-bit ternary (zero-preserving custom scheme)
Why "Lo6": "Late-layer o_proj at 6-bit". Restricting to layers 12-35
avoids the redux1-mixed-do6 failure mode where ALL 36
attn.o_proj at 6-bit broke the model (early layers are
too-close-to-pure-ternary; 6-bit affine has no zero level).
Config: rope_theta=1000000.0, rope_scaling=yarn (MLX-LM compatible)