AbstractPhil/geolip-captionbert-8192

GEOLIP CaptionBERT-8192-anchored

This will be the real prototype, fingerprinting was the earlier thought and the full upcoming prototype is ready for train.

The upcoming checkpoints will push after the process is successful, likely 1 hour per epoch for 5 epochs or so should be more than eneough.

This marks the first use of a new prototype object dubbed AnchorBank, which is designed specifically to house the necessary implications that the model is distilled with, while specifically aligning the expectation of those distillation valuations into the bank itself.

This allows the model to POTENTIALLY solve nth token lookup without a head, so a head will allow finetuning. If successful, the anchor bank will contain all the knowledge the model requires to geomewtrically represent it's data into expanded structures - if the losses and training process is correctly aligned to the task.

GEOLIP CaptionBERT-8192-fingerprinted

The next iteration will require an expanded fingerprinting axis-based relational bank, specifically to the alignment of the data and the teachers at training time.

The differentiation between what is learned and what is retained specifically expert-to-expert will enable this fingerprint to preserve the student model's integrity, which should allow cross_entropy training without complete geometric collapse and rapid overffiting.

As it stands this model is too rigid to train heads on, but I will directly improve it today and instill a core memory of geometry.

This geometry will be ever-learning, meaning when the core model trains from any experts, the bank must train as well. This geometry houses the entire internalized geometric embedding anchored fingerprinting spectrum, and this will likely evolve over the coming hours until the functional prototype comes to full fruition. Wish me luck as I design the reusable compact mechanism.

The final state of this will be a transparent embedding system with a transformer, specifically aligned stepwise.

No tricks, no gimmicks, just pure alignment math through solid and careful hypersphere rigidity analysis.

This alignment will allow the student to learn independently, without collapsing to overfitting due to exceeding internal utility, while the external heads still have more than a reasonable amount of information to access.

GEOLIP CaptionBERT-8192

A 26M-parameter caption encoder whose embedding space is the geometric intersection of five independently trained language models. Trained from scratch via consensus distillation — no pretrained weights, no expert models at inference.

Benchmarks

Evaluated against all five consensus teachers on STS-B, SICK-R, and MRPC. All models use mean-pooled embeddings with cosine similarity. No fine-tuning on any benchmark task.

Semantic Textual Similarity (STS-B)

Model	Params	Spearman ρ	Pearson r
DistilBERT-base	66M	0.5717	—
RoBERTa-base	125M	0.5436	—
CaptionBERT-8192	26M	0.5032	0.5100
ALBERT-base-v2	12M	0.4784	—
BERT-base	110M	0.4729	—
ModernBERT-base	149M	0.4215	—

Beats BERT-base (4.2× larger) and ModernBERT-base (5.7× larger) on general sentence similarity despite being trained exclusively on image captions.

SICK-R (Compositional Similarity)

Model	Params	Spearman ρ	Pearson r
DistilBERT-base	66M	0.6424	—
RoBERTa-base	125M	0.6296	—
CaptionBERT-8192	26M	0.6138	0.6645
BERT-base	110M	0.5865	—
ModernBERT-base	149M	0.5479	—
ALBERT-base-v2	12M	0.5364	—

#3/6 on compositional/syntactic similarity. Beats BERT-base, ModernBERT-base, and ALBERT on a task requiring structural language understanding.

MRPC (Paraphrase Detection)

Model	Params	F1	Accuracy	Threshold
RoBERTa-base	125M	0.8122	—	—
CaptionBERT-8192	26M	0.8068	0.6881	0.71
ALBERT-base-v2	12M	0.8067	—	—
BERT-base	110M	0.8062	—	—
DistilBERT-base	66M	0.8055	—	—
ModernBERT-base	149M	0.8038	—	—

#2/6 on paraphrase detection. 0.005 F1 behind RoBERTa, ahead of every other teacher. No classification head — pure cosine similarity with auto-discovered threshold. A model that has never seen a paraphrase pair during training nearly wins paraphrase detection.

Caption Embedding Quality

Metric	Value
Self-similarity mean	0.0040
Self-similarity max	0.7181
Top-1 retrieval cosine	0.5477
Top-5 retrieval cosine	0.4853

Near-zero average self-similarity across 1000 random captions — the embedding space has excellent discrimination. Every caption occupies its own distinct region on the hypersphere.

Consensus Fidelity

Metric	Value
Val cosine to consensus	0.862
Val R@1	1.000
Pentachoron CV	0.082
Training data	500K CC12M captions
Epochs	30
Position capacity	8,192 tokens
Parameters	25,958,016

How It Works

Five language models were aligned into a shared geometric space via whitened Procrustes rotation. Their normalized centroid — the geometric consensus — was proven to be a mathematical constant: five different random seeds produced the same consensus point to three decimal places.

This model was trained from scratch to reproduce that consensus directly from text. It distills the geometric intersection of five experts into a single small transformer.

The distillation is not standard knowledge distillation. It is multi-teacher geometric consensus distillation: the target is not any single teacher's output but the fixed point where all five teachers agree. Individual model errors cancel. What remains is the structural invariant of language understanding that five different architectures and training objectives independently discovered.

The alignment itself is directly distillable. The geometric structure is so robust that a from-scratch model learns it with R@1=1.000 from 18K examples in 80 seconds. The consensus manifold has pentachoron CV=0.084 — the tightest geometric regularity measured across all GEOLIP experiments — which means the function from text to embedding is smooth enough that sparse sampling covers it completely.

5 Expert Models (frozen)
    │
    ├── BERT-base-uncased        (110M, MLM)
    ├── ModernBERT-base          (149M, MLM + rotary, 8192 ctx)
    ├── RoBERTa-base             (125M, MLM + dynamic masking)
    ├── ALBERT-base-v2           (12M, MLM + SOP + factorized)
    └── DistilBERT-base          (66M, distilled from BERT)
        │
        ├── Extract pooled embeddings on 500K CC12M captions
        ├── Whitened Procrustes alignment to shared space
        ├── Consensus = normalized centroid (geometric constant)
        │
        └── Train student with:
            ├── InfoNCE(student, consensus)   — retrieval alignment
            ├── MSE(student, consensus)       — direct regression
            └── Pentachoron CV → 0.084        — geometric regularity

Planned Task Heads

The 768-dim consensus embedding serves as a frozen feature extractor. Linear heads trained on task-specific data snap on top.

Priority Heads

Head	Architecture	Training Data	Use Case
NLI / Entailment	cat(a, b, |a-b|, a*b) → Linear(3072, 3)	MNLI, SNLI	Agent reasoning validation
Semantic Similarity	Linear(768, 1) → sigmoid×5	STS-B train	Push STS-B toward 0.80+
Multi-Label Tagging	Linear(768, n_tags) → sigmoid	COCO categories, Visual Genome	Predict objects/attributes from captions
Paraphrase Detection	cos(a, b) → threshold (already works)	MRPC, QQP	Deduplication, reformulation detection
Sentiment	Linear(768, n_classes)	SST-2, IMDB	Content routing, sentiment analysis

Extended Heads

Head	Architecture	Training Data	Use Case
Caption Quality	Linear(768, 2)	Hallucination-annotated captions	Filter AI-generated training data
Cross-Encoder Reranker	cat(query, doc) → Linear(1536, 1)	MS MARCO	Two-stage retrieval scoring
Clustering	Linear(768, 256) → normalize	Unsupervised	Caption taxonomy, dataset organization
Relation Extraction	cat(subj_emb, obj_emb) → Linear(1536, n_rel)	Visual Genome relationships	Structured scene understanding
Caption-Image Score	Linear(768, 256) → cos with CLIP visual	CC12M image-caption pairs	Cross-modal retrieval without CLIP

Consensus Head Distillation

The same consensus trick applies to task heads. Train five separate NLI heads on the five frozen expert models, take the consensus prediction, distill into a single head on CaptionBERT. The head learns where all five experts agree on entailment — same noise cancellation, one layer instead of five.

Training Datasets — Current and Planned

Current

Dataset	Samples Used	Content	Notes
CC12M LLaVA-Next	500K	Re-captioned CC12M with LLaVA-Next	Primary training data, mean ~92 tokens

Planned — Caption Saturation

The model tokenizes to 512 but has 8,192 position capacity. Longer, more complex captions will exercise the full context window and push v_cos beyond 0.862.

Dataset	Size	Content	Why
ShareGPT4V	1.2M	GPT-4V detailed image descriptions	Longer captions (200-500 tokens), richer vocabulary
DOCCI	15K	Expert-written dense image descriptions	Extremely detailed, 100-300 words per image
Localized Narratives	850K	Spoken descriptions with mouse traces	Narrative structure, temporal ordering
DenseCap	5.4M	Region-level dense captions	Fine-grained spatial descriptions
TextCaps	145K	Captions requiring OCR reading	Text-in-image understanding
VizWiz	32K	Captions from blind/low-vision users	Diverse, real-world, often longer descriptions
COCO Captions	600K	5 captions per image, human-written	Short but high-quality, broad coverage
SBU Captions	1M	Web-crawled image-caption pairs	Scale and diversity

Planned — Domain Extension

Dataset	Size	Content	Why
BookCorpus	11K books	Long-form narrative text	Exercise 8K context, literary language
Wikipedia	6M articles	Encyclopedic text	General knowledge, factual density
Natural Questions	300K	Question-answer pairs	QA capability for retrieval heads
MS MARCO	1M	Passages + queries	Retrieval training for reranker head

Architecture

Input text
    │
    ├── BERT WordPiece tokenizer (30,522 vocab)
    ├── Token embeddings (384-dim)
    ├── Position embeddings (8,192 capacity)
    │
    ├── 6× Transformer Encoder Layer
    │   (384-dim, 6 heads, 1536 FFN, GELU, pre-norm)
    │
    ├── Mean pool over non-padding tokens
    ├── Projection: 384 → 384 → GELU → LN → 768
    └── L2 normalize
        │
        └── (B, 768) consensus-aligned embedding

Usage

import torch
from transformers import AutoTokenizer
from caption_encoder import CaptionEncoder

# Load
tokenizer = AutoTokenizer.from_pretrained("google-bert/bert-base-uncased")
model = CaptionEncoder(
    vocab_size=30522, max_len=8192, d_model=384,
    n_heads=6, n_layers=6, d_ff=1536, output_dim=768,
    dropout=0.0, pad_token_id=0)
model.load_state_dict(torch.load("best_model.pt", weights_only=True))
model.eval()

# Encode
texts = ["A cat sitting on a windowsill", "A dog playing fetch on the beach"]
tokens = tokenizer(texts, max_length=512, padding="max_length",
                   truncation=True, return_tensors="pt")
with torch.no_grad():
    embeddings = model(tokens["input_ids"], tokens["attention_mask"])

# embeddings: (2, 768) L2-normalized
similarity = embeddings[0] @ embeddings[1]
print(f"Similarity: {similarity:.3f}")

Training Curve

Epoch	t_cos	v_cos	v_cv	Time
1	0.804	0.803	0.104	689s
5	0.819	0.819	0.086	689s
10	0.831	0.829	0.087	689s
15	0.842	0.840	0.078	688s
20	0.851	0.849	0.078	690s
25	0.860	0.859	0.092	689s
30	0.863	0.862	0.082	689s

R@1=1.000 and t_acc=1.000 throughout all 30 epochs. Train/val gap < 0.002 — no overfitting on 500K samples.

GEOLIP Family

System	Type	Params	Output
CLIP-L ctx576	Memory bank	34M	pooled (768,)
CLIP-L seq77	Memory + sequence	53M	pooled + seq (77, 768)
Meridian bigG	Memory + sequence	167M	pooled + seq (77, 1280)
Conduit v0	Multi-expert hub	8.8M	aligned (1024,)
CaptionBERT-8192	Consensus distilled	26M	consensus (768,)

Citation

See Geometric Memory Part I and Part II for the full methodology, including the pentachoron consensus proof, whitened Procrustes alignment, compositional convolution experiments, and the path from accumulation-based memory to alignment-based distillation.

License

Apache 2.0