Selected strict-small checkpoint from the controlled FACTORIZED study. The model uses an LTG-BERT-style encoder trained with whole-word masking and an auxiliary replaced-token objective. Its 384-dimensional representation is partitioned into three 128-dimensional factor readouts. In this natural-dense control the factor readout is dormant during language-model inference.

Model summary

Property	Value
Parameters	approximately 33.3M
Layers / hidden size	12 / 384
Attention heads	6
FFN size	1,280
Context length	512
Tokenizer	byte-level BPE, 16,384 tokens
Training corpus	BabyLM strict-small, conservatively counted as 10M words
Total exposure	100M words
Optimizer	LAMB
Peak learning rate	3.5e-3

Usage

python

from transformers import AutoModelForMaskedLM, AutoTokenizer

repo_id = "miguelcsx/factorized-natural-dense"
revision = "chck_100M"

tokenizer = AutoTokenizer.from_pretrained(repo_id, revision=revision)
model = AutoModelForMaskedLM.from_pretrained(
    repo_id,
    revision=revision,
    trust_remote_code=True,
)

Remote code is required for the custom TOLM architecture. Review tolm.py before loading it in a security-sensitive environment.

Development evaluation

The selected chck_100M checkpoint led the FACTORIZED tournament on the pre-registered shared full-task mean among the three finalists.

Evaluation	Score
BLiMP	70.01
BLiMP Supplement	60.63
Entity Tracking	17.70
COMPS	51.41
GlobalPIQA	36.09

These are development measurements, not a claim of an official leaderboard placement. The complete official BabyLM 2026 evaluation is being regenerated for submission.

Checkpoint revisions

The repository contains all strict-small challenge revisions: chck_1M through chck_10M, then chck_20M through chck_100M. The final submission checkpoint is chck_100M.

Provenance

Final checkpoint model SHA-256: ba89940028a902f4aa09385966b8e83bb346a0abaab6899feec1fa2d3a4b7e13.
Evaluation backend: mntp.
Fast-evaluation parity maximum absolute logit delta: 0.0.
Training and compliance details are recorded in training_manifest.json.

Limitations

This is a small English developmental language model trained for controlled BabyLM experiments. It is not a general-purpose assistant. The factorized readout in this control is dormant during ordinary masked-language-model inference.