GigaAM: the family of open-source acoustic models for speech processing

Latest News

• 2024/12 — MIT License, GigaAM-v2 (-15% and -12% WER Reduction for CTC and RNN-T models, respectively), ONNX export support
• 2024/05 — GigaAM-RNNT (-19% WER Reduction), long-form inference using external Voice Activity Detection
• 2024/04 — GigaAM Release: GigaAM-CTC (SoTA Speech Recognition model for the Russian language), GigaAM-Emo

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Table of Contents

• Overview
• Installation
• GigaAM: The Foundational Model
• GigaAM for Speech Recognition
  • GigaAM-CTC
  • GigaAM-RNNT
• GigaAM-Emo: Emotion Recognition
• License
• Links

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Overview

GigaAM (Giga Acoustic Model) is a family of open-source models for Russian speech processing tasks, including speech recognition and emotion recognition. The models are built on top of the Conformer architecture and leverage self-supervised learning (wav2vec2-based for GigaAM-v1 and HuBERT-based for GigaAM-v2).

GigaAM models are state-of-the-art open-source solutions for their respective tasks in the Russian language.

This repository includes:

• GigaAM: A foundational self-supervised model pre-trained on massive Russian speech datasets.
• GigaAM-CTC and GigaAM-RNNT: Fine-tuned models for automatic speech recognition (ASR).
• GigaAM-Emo: A fine-tuned model for emotion recognition.

Installation

Requirements

• Python ≥ 3.8
• ffmpeg installed and added to your system's PATH

Install the GigaAM Package

1. Clone the repository:

   git clone https://github.com/salute-developers/GigaAM.git
   cd GigaAM
   

2. Install the package in editable mode:

   pip install -e .
   

3. Verify the installation:

   import gigaam
   model = gigaam.load_model("ctc")
   print(model)
   

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GigaAM: The Foundational Model

GigaAM is a Conformer-based foundational model (240M parameters) pre-trained on 50,000+ hours of diverse Russian speech data.

It serves as the backbone for the entire GigaAM family, enabling state-of-the-art fine-tuned performance in speech recognition and emotion recognition.

There are 2 available versions:

• GigaAM-v1 was trained with a wav2vec2-like approach and can be used by loading the
  v1_ssl
  model version.
• GigaAM-v2 was trained with a HuBERT-like approach and allows us to get GigaAM-v2 ASR model with better quality. It can be used by loading the
  v2_ssl
  or
  ssl
  model version.

More information about GigaAM-v1 can be found in our post on Habr.

GigaAM Usage Example

import gigaam
model = gigaam.load_model('ssl') # Options: "ssl", "v1_ssl"
embedding, _ = model.embed_audio(audio_path)

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GigaAM for Speech Recognition

We fine-tuned the GigaAM encoder for ASR using two different architectures:

• GigaAM-CTC was fine-tuned with Connectionist Temporal Classification and a character-based tokenizer.
• GigaAM-RNNT was fine-tuned with RNN Transducer loss.

Fine-tuning was done for both GigaAM-v1 and GigaAM-v2 SSL models, so we have 4 ASR models:

and

v2

versions for both CTC and RNNT.

Training Data

The models were trained on publicly available Russian datasets:

Dataset	Size (hours)	Weight
Golos	1227	0.6
SOVA	369	0.2
Russian Common Voice	207	0.1
Russian LibriSpeech	93	0.1

Performance Metrics (Word Error Rate)

Model	Parameters	Golos Crowd	Golos Farfield	OpenSTT YouTube	OpenSTT Phone Calls	OpenSTT Audiobooks	Mozilla Common Voice 12	Mozilla Common Voice 19	Russian LibriSpeech
Whisper-large-v3	1.5B	13.9	16.6	18.0	28.0	14.4	5.7	5.5	9.5
NVIDIA FastConformer	115M	2.2	6.6	21.2	30.0	13.9	2.7	5.7	11.3
GigaAM-CTC-v1	242M	3.0	5.7	16.0	23.2	12.5	2.0	10.5	7.5
GigaAM-RNNT-v1	243M	2.3	5.0	14.0	21.7	11.7	1.9	9.9	7.7
GigaAM-CTC-v2	242M	2.5	4.3	14.1	21.1	10.7	2.1	3.1	5.5
GigaAM-RNNT-v2	243M	2.2	3.9	13.3	20.0	10.2	1.8	2.7	5.5

Speech Recognition Example (GigaAM-ASR)

Basic usage: short audio transcribation (up to 30 seconds)

import gigaam
model_name = "rnnt"  # Options: "v2_ctc" or "ctc", "v2_rnnt" or "rnnt", "v1_ctc", "v1_rnnt"
model = gigaam.load_model(model_name)
transcription = model.transcribe(audio_path)

Long-form audio transcribation

1. Install external VAD dependencies (pyannote.audio library) with

   pip install gigaam[longform]
   

2. • Generate Hugging Face API token
   • Accept the conditions to access pyannote/voice-activity-detection files and content.
   • Accept the conditions to access pyannote/segmentation files and content.
3. Use the
   model.transcribe_longform
   method:

   import os
   import gigaam
   
   os.environ["HF_TOKEN"] = "<HF_TOKEN>"
   
   model = gigaam.load_model("ctc")
   recognition_result = model.transcribe_longform("long_example.wav")
   
   for utterance in recognition_result:
      transcription = utterance["transcription"]
      start, end = utterance["boundaries"]
      print(f"[{gigaam.format_time(start)} - {gigaam.format_time(end)}]: {transcription}")
   

ONNX inference example

1. Export the model to ONNX using the
   model.to_onnx
   method:

   onnx_dir = "onnx"
   model_type = "rnnt" # or "ctc"
   
   model = gigaam.load_model(
      model_type,
      fp16_encoder=False,  # only fp32 tensors
      use_flash=False,  # disable flash attention
   )
   model.to_onnx(dir_path=onnx_dir)
   

2. Run ONNX inference:

   from gigaam.onnx_utils import load_onnx_sessions, transcribe_sample
   
   sessions = load_onnx_sessions(onnx_dir, model_type)
   transcribe_sample("example.wav", model_type, sessions)
   

All these examples can also be found in inference_example.ipynb notebook.

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GigaAM-Emo: Emotion Recognition

GigaAM-Emo is a fine-tuned model for emotion recognition trained on the Dusha dataset. It significantly outperforms existing models on several metrics.

Performance Metrics

		Crowd			Podcast
	Unweighted Accuracy	Weighted Accuracy	Macro F1-score	Unweighted Accuracy	Weighted Accuracy	Macro F1-score
DUSHA baseline (MobileNetV2 + Self-Attention)	0.83	0.76	0.77	0.89	0.53	0.54
АБК (TIM-Net)	0.84	0.77	0.78	0.90	0.50	0.55
GigaAM-Emo	0.90	0.87	0.84	0.90	0.76	0.67

Emotion Recognition Example (GigaAM-Emo)

import gigaam
model = gigaam.load_model('emo')
emotion2prob: Dict[str, int] = model.get_probs("example.wav")

print(", ".join([f"{emotion}: {prob:.3f}" for emotion, prob in emotion2prob.items()]))

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License

GigaAM's code and model weights are released under the MIT License.

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Links

• [habr] GigaAM: класс открытых моделей для обработки звучащей речи
• [youtube] GigaAM: Семейство акустических моделей для русского языка
• [youtube] Speech-only Pre-training: обучение универсального аудиоэнкодера