README.md

---
configs:
- config_name: default
  data_files:
  - split: train
    path: data/train-*
  - split: test
    path: data/test-*
library_name: datasets
tags:
- audio
- croissant
dataset_info:
  features:
  - name: audio
    dtype:
      audio:
        sampling_rate: 16000
  - name: text
    dtype: string
  - name: speaker_id
    dtype: string
  - name: gender
    dtype: string
  - name: age_group
    dtype: string
  - name: duration_ms
    dtype: int32
  - name: is_noise
    dtype: bool
  - name: tags
    list: string
  - name: entry_id
    dtype: string
  - name: segment_id
    dtype: string
  - name: start_ms
    dtype: int32
  - name: end_ms
    dtype: int32
  - name: annotator
    dtype: string
  splits:
  - name: train
    num_bytes: 101593759705
    num_examples: 1659246
  - name: test
    num_bytes: 13984403336
    num_examples: 215297
  download_size: 114499980027
  dataset_size: 115578163041
license: cc-by-4.0
task_categories:
- text-to-speech
- automatic-speech-recognition
language:
- lt
pretty_name: LIEPA-2
---
# Dataset Card for LIEPA-2

## Dataset Summary

The **LIEPA-2** dataset is a large-scale annotated speech corpus for the Lithuanian language, developed under the project "Development of Services Controlled by Lithuanian Speech" (LIEPA-2). It is a phonetically representative, structured collection of data (audio recordings and annotations) designed for scientific research in speech technologies and the development of electronic services.

* **Total Duration:** 1000 hours
* **Access:** Due to the large size of the dataset, it is not available for direct download. Interested parties are requested to contact the creators at **gediminas.navickas@mif.vu.lt**.

The dataset was created by **Vilnius University** (Institute of Data Science and Digital Technologies, Faculty of Philology) and partners.

## Dataset Statistics

* **Total Duration:** 1000 hours
* **Total Speakers:** 2,621
* **Speech Types:**
    * Read speech: 91%
    * Spontaneous speech: 9%

### Recording Environments
* **Studio recordings:** 62%
* **Dictaphone recordings:** 28%
* **Audio books:** 3%
* **TV broadcasts:** 3%
* **Radio broadcasts:** 2%
* **Telephone recordings:** 2%

### Speaker Demographics
* **Gender Distribution:**
    * Female: 56%
    * Male: 44%
* **Age Distribution:**
    * Under 12 years: 8%
    * 13–17 years: 3%
    * 18–25 years: 18%
    * 26–60 years: 61%
    * Over 60 years: 10%

## Dataset Structure

### Data Format
This dataset is **SLICED** for ASR training. Each row represents a single audio segment (utterance or noise event).

*   **Audio**: The sliced audio segment (WAV, 16kHz).
*   **Text**: The transcription of the segment.
    *   For **Noise Segments** (`is_noise=True`), the text contains the noise label (e.g., `+BREATH+`, `+SMACK+`, `+GARBAGE+`).
*   **Metadata Fields**:
    *   `is_noise`: **Boolean**. `True` if the segment represents a noise event, `False` for speech. **Note**: The dataset explicitely includes noise segments as separate rows for training stability/negative sampling.
    *   `speaker_id`: Unique speaker identifier.
    *   `gender`: `Female` / `Male`.
    *   `age_group`: e.g., `26-60`, `0-12`.
    *   `duration_ms`: Length of segment in milliseconds.
    *   `tags`: List of entry-level tags (e.g., `['abc']` for alphabet reading).
    *   `annotator`: 2-letter code of the annotator (derived from Speaker ID).
    *   `entry_id`: ID of the original recording (EAF file).
    *   `segment_id`: ID of the segment within the recording.
    *   `start_ms` / `end_ms`: Timestamp in the original file.

### Original Documentation
For the full labeling protocol and noise class definitions, please refer to the **[readme.pdf](./docs/LIEPA-2-readme.pdf)** included in the repository root.

## Additional Information

### Licensing Information
The LIEPA-2 dataset is distributed under the **CC BY (Creative Commons Attribution)** license.

### Citation Information
When using this dataset for the development of other products, please mention in your product description that the dataset was created at **Vilnius University** under the project **"Lietuvių šneka valdomų paslaugų plėtra – LIEPA 2"**.

### Contact
For access to the original dataset, please contact: **gediminas.navickas@mif.vu.lt**

* **Project Website:** [liepa2.rastija.lt](http://liepa2.rastija.lt)
* **Creators:** Vilnius University (Institute of Mathematics and Informatics, Faculty of Philology).

### References
- [Garsynas LIEPA-2](https://xn--ratija-ckb.lt/liepa-2/infrastrukturines-paslaugos/garsynas/)