privacy-filter-multilingual-v2-mlx

OpenMed Privacy Filter Multilingual v2 - MLX BF16

A native MLX port of OpenMed/privacy-filter-multilingual-v2 for Apple Silicon PII detection and de-identification with OpenMed. This is the unquantized BF16 reference artifact. For the 8-bit sibling, see OpenMed/privacy-filter-multilingual-v2-mlx-8bit.

Family at a glance:

• PyTorch source: OpenMed/privacy-filter-multilingual-v2
• MLX BF16 (this repo): Apple Silicon, full precision, 2.6 GiB weights
• MLX 8-bit: OpenMed/privacy-filter-multilingual-v2-mlx-8bit - Apple Silicon, 1.4 GiB weights

At a glance

• Source checkpoint: OpenMed/privacy-filter-multilingual-v2
• OpenMed MLX repo: OpenMed/privacy-filter-multilingual-v2-mlx
• Label schema: 54 fine-grained multilingual PII categories
• Output space: 217 BIOES classes (O plus B/I/E/S for each category)
• Languages: 16 languages from the source card: ar, bn, de, en, es, fr, hi, it, ja, ko, nl, pt, te, tr, vi, zh
• Weight format: safetensors
• Quantization: none (BF16 reference)

Q8 sibling validation

The 8-bit sibling was compared against this BF16 artifact on 10 golden PII samples. Decoded entity spans matched across all samples. Average Q8/BF16 argmax agreement was 100.00% with average logit MAE 0.1902; average local forward time was 15.1 ms for BF16 vs 8.4 ms for Q8.

What it does

This model is an MLX packaging of OpenMed/privacy-filter-multilingual-v2, the second-generation multilingual checkpoint for fine-grained PII extraction across 16 languages. It uses OpenAI's Privacy Filter architecture and predicts 217 BIOES classes (O plus B/I/E/S for each category). The OpenMed PrivacyFilterMLXPipeline runs BIOES-aware Viterbi decoding so callers receive grouped spans instead of raw token tags.

Label coverage highlights:

• Identity: FIRSTNAME, MIDDLENAME, LASTNAME, AGE, GENDER, USERNAME, OCCUPATION, ORGANIZATION
• Contact and address: EMAIL, PHONE, URL, STREET, BUILDINGNUMBER, CITY, COUNTY, STATE, ZIPCODE
• Financial and crypto: BANKACCOUNT, IBAN, BIC, CREDITCARD, CVV, PIN, BITCOINADDRESS, ETHEREUMADDRESS
• Vehicle, digital, and auth: VIN, VRM, IPADDRESS, MACADDRESS, IMEI, PASSWORD
• Date and amount labels such as DATE, DATEOFBIRTH, TIME, AMOUNT, CURRENCY, and CURRENCYCODE

The full label map is included in id2label.json.

Architecture

File set

The MLX runtime uses the tiktoken-compatible o200k_base tokenizer path. tokenizer.json and tokenizer_config.json are bundled so consumers can inspect the tokenizer assets and keep the artifact self-contained.

Quick start

With OpenMed

pip install -U "openmed[mlx]"

from openmed import extract_pii, deidentify
from openmed.core import OpenMedConfig

model_name = "OpenMed/privacy-filter-multilingual-v2-mlx"
text = (
    "Patient Sarah Johnson (DOB 03/15/1985), MRN 4872910, "
    "phone 415-555-0123, email [email protected]."
)

result = extract_pii(
    text,
    model_name=model_name,
    config=OpenMedConfig(backend="mlx"),
)
for ent in result.entities:
    print(ent.label, ent.text, round(ent.confidence, 4))

masked = deidentify(
    text,
    method="mask",
    model_name=model_name,
    config=OpenMedConfig(backend="mlx"),
)
print(masked.deidentified_text)

For non-MLX hosts, use the source PyTorch checkpoint OpenMed/privacy-filter-multilingual-v2.

Direct MLX usage

from huggingface_hub import snapshot_download
from openmed.mlx.inference import PrivacyFilterMLXPipeline

model_path = snapshot_download("OpenMed/privacy-filter-multilingual-v2-mlx")
pipe = PrivacyFilterMLXPipeline(model_path)

print(pipe("Email me at [email protected] after 5pm."))

Loading from a local snapshot

from openmed.mlx.models import load_model
import mlx.core as mx

model = load_model("/path/to/privacy-filter-multilingual-v2-mlx")
ids = mx.array([[1, 100, 200, 300]], dtype=mx.int32)
mask = mx.ones((1, 4), dtype=mx.bool_)
logits = model(ids, attention_mask=mask)
print(logits.shape)

Hardware notes

• Designed for Apple Silicon with MLX.
• CPU inference may work, but GPU-backed MLX on M-series Macs is the intended runtime.
• The Python package path is pip install -U "openmed[mlx]".

Credits

This artifact builds on:

• OpenMed/privacy-filter-multilingual-v2 by OpenMed
• openai/privacy-filter and OpenAI's opf training/evaluation tooling
• The datasets listed in the model-card metadata above
• Apple's MLX framework

License

Apache 2.0, matching the source checkpoint metadata.