---
language:
- uz
- ru
task_categories:
- automatic-speech-recognition
tags:
- forced-alignment
- nemo
- stt-training
---

# Forced-Aligned STT Dataset

Source dataset: `instinct-org/default_voices_chunked`

Aligned dataset: `instinct-org/default_voices_chunked_nfa_aligned`

Rows: 134236 successfully aligned rows

This dataset adds NeMo Forced Aligner metadata for STT training and timestamp quality
control. Source rows that did not produce usable CTM alignments are excluded from the
published data.

Added columns:

- `nfa_token_alignments`: NeMo token/subword CTM spans
- `nfa_word_alignments`: word-level CTM spans
- `nfa_segment_alignments`: segment-level CTM spans
- `nfa_character_alignments`: character spans; true only when the model token CTM is character
  level, otherwise derived from word spans
- `nfa_character_alignment_source`
- `nfa_true_character_alignment`
- `nfa_alignment_model`
- `nfa_alignment_status`
- `nfa_alignment_error`

NeMo Forced Aligner emits token, word, and segment CTM levels for this model family. With
BPE/subword ASR models, token level is not the same as character level.

Model: `nvidia/stt_uz_fastconformer_hybrid_large_pc`