smajji/nemotron-hinglish-v3

Nemotron Hinglish v3

Nemotron-Hinglish-v3 is a fine-tune of nvidia/nemotron-3.5-asr-streaming-0.6b specialized for English, Hindi and Hinglish (Hindi-English code-switching), built for cache-aware streaming ASR, with improved number / phone-number / digit accuracy.

It preserves the base model's FastConformer-Transducer (RNNT) cache-aware streaming architecture (24 layers, 1024 hidden, 600M params) and its multi-lingual 13088 BPE vocab + 128 language prompts, including the auto language-detection prompt.

Model Details

• Base model: nvidia/nemotron-3.5-asr-streaming-0.6b
• Architecture: FastConformer-Transducer (RNNT), cache-aware streaming, 8x subsampling
• Parameters: ~600M
• Sampling rate: 16 kHz mono
• Target languages: English (en), Hindi (hi), Hinglish code-switched (auto prompt for code-mixing)
• Streaming: cache-aware, chunk sizes 80/160/320/560/1120 ms

Training Data

Fine-tuned on a large bilingual + code-mixed mix with number/symbol-dense corpora added for digit & phone-number accuracy:

Slice	Language	Role
SPGISpeech	en	clean English
IISc_SPICOR	en	Indian-accent English
Peoples Speech	en	large English
SPRING Hindi-1482Hrs + Shrutilipi	hi	Hindi
IndicVoices-R Hindi	hi	Hindi
UJS + Hinglish-CC	hinglish	code-mixed
FLEURS (en + hi)	en/hi	~21% digit-dense
earnings22	en	~22% digit, ~7.7% symbol — phone/number rich

Trained with auto language self-detection (0.9 ratio) for code-switching, punctuation/casing preserved.

Benchmark

Greedy decode, punctuation-insensitive WER (held-out sample, auto prompt). Compared to previous releases:

Language	Nemotron-Hinglish-v3	v2	v1
English	4.0%	5.1%	4.2%
Hindi	12.2%	13.4%	12.4%
Hinglish	29.2%	30.0%	22.6%

• Digit / phone-number accuracy improved ~32% (fewer digit-sequence errors than v2), from added number-dense corpora.

Usage (NeMo)

import nemo.collections.asr as nemo_asr
model = nemo_asr.models.ASRModel.restore_from("nvidia/nemotron-hinglish-v3")
model.eval()
transcriptions = model.transcribe(["audio.wav"], batch_size=4)
print(transcriptions)