Fara-7B Abliterated v2

A refusal-direction-orthogonalized variant of microsoft/Fara-7B (Qwen2.5-VL based).

Built using:

Method

Using harmful + harmless probe sets, residual-stream activations were extracted across layers 0–27 to identify the strongest refusal direction.

Best layer:

  • 13

Orthogonalization was applied in fp32 to:

  • embed_tokens
  • every self_attn.o_proj
  • every mlp.down_proj

Total modified tensors:

  • 57

Formula:

W ← W - r rᵀ W

Results

Held-out harmful evaluation set:

  • Original Fara-7B: 5/160 compliance (~3.1%)
  • Abliterated v2: 158/160 compliance (~98.75%)

Held-out refusal probe:

  • Before: 155/160 refusals
  • After: 2/160 refusals

Notes

  • fp32 surgery used to avoid precision issues from v1
  • edits applied only to the language tower
  • held-out evaluation set was separate from the layer-selection probe set

Research artifact only. Use responsibly and follow upstream Fara/Qwen license terms.

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