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Open-weight model · Token classification

LondonLB

by J jmcewan3/LondonLB

LondonLB is an open-weight model for token classification from J, released under MIT License. It has 184M parameters and a 512-token context. At 16-bit it needs about 0.4 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index. It draws 25 downloads a month.

LondonLB is a fine-tuned version of microsoft/deberta-v3-base that identifies personal names in Reginald R. Sharpe's Calendar of Letter-Books of the City of London, volumes A to I (c. 1275–1422).

Parameters184M
Context512
Weights735.4 MB
Licensemit
AccessOpen weights
Monthly Downloads25

Runs On

What it takes to serve LondonLB (184M parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.

PrecisionWeightsMemory neededCheapest setupPer hourAlso fits
16-bit 0.4 GB 0.4 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 0.2 GB 0.2 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 0.1 GB 0.1 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00

Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Oct 8, 2026.

LondonLB on every accelerator the SAVRN Index prices, at every precision

Model Card

By J, published under mit, revision cc021e06f33e.

LondonLB: personal-name recognition for the London Letter-Books

LondonLB is a fine-tuned version of microsoft/deberta-v3-base that identifies personal names in Reginald R. Sharpe's Calendar of Letter-Books of the City of London, volumes A to I (c. 1275–1422). It was built to support research on medieval London naming practices, in particular the transition from by-names to hereditary family names, by making it possible to extract every named individual from roughly 14,800 calendar entries.

On a held-out gold-standard set of 200 entries containing 1,136 names, the model reaches an exact-match F1 of 0.977, and finds 1,135 of the 1,136 names at least partially.

Model details

Read the full model card (1,524 words)

Configuration

Architecture
DebertaV2ForTokenClassification
Context length (tokens)
512
Layers
12
Hidden size
768
Feed-forward size
3,072
Attention heads
12
Vocabulary size
128,100
Model type
deberta-v2

Identity and Version

Repository
jmcewan3/LondonLB
Publisher
J
Task
Token classification
Modality
Text
Library
transformers
Parameters
184M parameters
Languages
en
Revision
cc021e06f33e6df4fc4d48b995f0bfc8210fe8b9
First published
2026-09-26
Last updated
2026-10-08

Files and Weights

10 files, 746.5 MB in total. The weights are 1 file totalling 735.4 MB in safetensors.

Weights1 file · 735.4 MB
Configuration3 files · 1.4 KB
Tokenizer2 files · 8.7 MB
Documentation1 file · 11.1 KB
Other2 files · 2.5 MB
Repository1 file · 1.5 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights735.4 MB eeb6ea2a4c97
added_tokens.jsonConfiguration26 B —
config.jsonConfiguration1.1 KB —
special_tokens_map.jsonConfiguration301 B —
README.mdDocumentation11.1 KB —
2026_oct2_convertandtrain.ipynbOther25.8 KB —
spm.modelOther2.5 MB c679fbf93643
.gitattributesRepository1.5 KB —
tokenizer.jsonTokenizer8.7 MB —
tokenizer_config.jsonTokenizer1.3 KB —

License and Download

License
mit
Access
Open weights, no gate
Download size
735.4 MB
Download from J

Released by J through its official repository on Hugging Face. Read the license.

Built From

Memory Requirements

PrecisionWeights in memory
As published735.4 MB
16-bit0.4 GB
8-bit0.2 GB
4-bit0.1 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Questions About LondonLB

How much GPU memory does LondonLB need?

About 0.4 GB at 16-bit and 0.1 GB at 4-bit: the weights (184M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run LondonLB on?

At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.

Can I use LondonLB commercially?

Yes. LondonLB is released under MIT License. The MIT License is a short permissive license. It permits commercial use, modification and redistribution, provided the copyright notice and permission notice are included.

What is LondonLB's context length?

512 tokens, from the maximum position embeddings in its published configuration.

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