New architecture: TMT — dynamic graph attention + adaptive depth routing, 29.4 PPL at 48% compute (120M params)

by vigneshwar234 - opened 21 days ago

TemporalMesh Transformer (TMT v3) — New efficient transformer: 29.4 PPL, 48% compute, 5 innovations

Hi everyone! I'm releasing TemporalMesh Transformer (TMT v3), an open-source PyTorch transformer architecture that achieves state-of-the-art efficiency at 120M parameters.

The problem with current transformers

Standard transformers have three hard inefficiencies that haven't been fixed together:

Attention is O(S²) — quadratic in sequence length
Attention topology is static — fully connected, never adapts to semantic content
Every token uses all N layers regardless of complexity

TMT fixes all three simultaneously

Innovation	What it does	Cost
Mesh Attention	Dynamic kNN graph rebuilt per-layer from cosine similarity	O(S·k)
Temporal Decay	Learned multiplicative attenuation of distant tokens post-softmax	~0 overhead
Adaptive Exit	Per-token gate: punctuation exits layer 2, rare words layer 12	−52% compute
Dual-Stream FFN	Parallel syntax + semantic streams, sigmoid fusion	Same FLOPs
EMA Anchors	16 persistent fast-weight vectors, cross-sequence recall	32KB params

Key results (120M params, all seeds 42/1337/2024)

WikiText-2: 29.4 PPL (vs 42.1 vanilla, 31.8 Mamba, 33.1 RWKV)
WikiText-103: 36.1 PPL (vs 51.3 vanilla, 38.4 Mamba)
LongBench: 53.4 avg score (vs 51.3 Mamba, 49.8 Longformer)
C4: 27.4 PPL, The Pile: 35.8 PPL, OpenWebText: 30.1 PPL
Throughput: 138K tokens/sec A100 FP16
Superadditive gain: 12.7 PPL improvement vs 8.6 from summing components individually

Quick start

from tmt.model.config import TMTConfig
from tmt.model.model import TMTModel
model = TMTModel(TMTConfig(vocab_size=50257, d_model=512, n_heads=8, n_layers=12))
out = model(tokens)  # out.logits, out.exit_masks, out.graph_edges, out.confidences

EleutherAI
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pythia-70m