privacy-filter-nemotron-v2-mlx

OpenMed Privacy Filter Nemotron v2 - MLX BF16

A native MLX port of OpenMed/privacy-filter-nemotron-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-nemotron-v2-mlx-8bit.

Family at a glance:

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

At a glance

• Source checkpoint: OpenMed/privacy-filter-nemotron-v2
• OpenMed MLX repo: OpenMed/privacy-filter-nemotron-v2-mlx
• Label schema: 55 fine-grained Nemotron-style PII categories
• Output space: 221 BIOES classes (O plus B/I/E/S for each category)
• Languages: 20-language metadata from the source card: bg, cs, da, de, el, en, es, et, fi, fr, hr, hu, it, lt, lv, nl, pl, pt, ro, sk
• 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 99.55% with average logit MAE 0.1769; average local forward time was 14.2 ms for BF16 vs 7.9 ms for Q8.

What it does

This model is an MLX packaging of OpenMed/privacy-filter-nemotron-v2, the second-generation Nemotron-schema checkpoint with a broader training mix and a more recall-oriented adaptation recipe than the first Nemotron branch. It uses OpenAI's Privacy Filter architecture and predicts 221 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 and demographics: first_name, last_name, age, gender, nationality, language
• Contact and address: email, phone_number, street_address, city, country, postcode
• Government and regulated IDs: ssn, national_id, tax_id, certificate_license_number
• Financial and secrets: account_number, credit_debit_card, cvv, pin, password, swift_bic
• Medical, workplace, online, vehicle, and time identifiers such as medical_record_number, employee_id, ipv4, url, license_plate, date, and time

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-nemotron-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-nemotron-v2.

Direct MLX usage

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

model_path = snapshot_download("OpenMed/privacy-filter-nemotron-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-nemotron-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-nemotron-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

The source checkpoint model card currently declares license: other; this MLX packaging follows that source license metadata. Review the source model card before redistribution.