Teen-Different/arc-agi-2-encoded-sft
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Tarun Reddi PRO
Teen-Different
AI & ML interests
Generative AI, Modular AI Systems, Reinforcement Learning
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3 days ago
Adaptive Attention at Inference Time: Does It Actually Work?
A hypernetwork that rewires GPT's value heads on every forward pass. The answer: not a clean win — but not a failure either.
Blog post: https://teendifferent.substack.com/p/adaptive-attention-at-inference-time
Code: https://github.com/REDDITARUN/a-gpt
Weights: https://huggingface.co/Teen-Different/adaptive-gpts
What This Is
Five small language model variants trained for 12k steps on a 300M token mixed corpus, answering one question: can the residual stream be used to slightly rewrite the model's own computation while it's running?
Instead of a fixed W_v for every context, a TinyHeadTransformer hypernetwork generates low-rank (LoRA-style) updates to the value projection of each attention head — conditioned on the current residual stream. Each token gets a dynamically adapted value transformation.
The Five Models
Base GPT — 28.9M params, 139 tok/s, val loss ~3.82
Matched GPT (+2 layers) — 30.5M params, 204 tok/s, val loss ~3.80
Adaptive GPT — 30.5M params, 38.7 tok/s, val loss ~3.88–3.92
Diffusion GPT — 28.9M params, 110 tok/s, val loss ~5.0–5.2
Adaptive Diffusion GPT — 30.5M params, 40.4 tok/s, val loss ~5.0–5.2
Architecture: 4 layers, 4 heads, d_model=256, context=256, RoPE, GPT-2 tokenizer.
How the Hypernetwork Works
For each attention head, a TinyHeadTransformer encodes the head's residual stream slice, mean-pools it to a conditioning vector, then projects into low-rank factors A (d×r) and B (r×d) at rank=8. The dynamic value update follows LoRA conventions with alpha/r scaling. B is zero-initialized so the adaptive path starts inert and the model begins as a vanilla GPT — critical for training stability.
The diffusion variant uses bidirectional attention, RMSNorm, squared ReLU, and a learned timestep embedding.
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