---
license: other
license_name: anki-revlogs-10k
license_link: LICENSE
dataset_info:
  - config_name: revlogs
    splits:
      - name: all
        num_examples: 727738650
  - config_name: cards
    splits:
      - name: all
        num_examples: 208432491
  - config_name: decks
    splits:
      - name: all
        num_examples: 2066838
configs:
- config_name: revlogs
  data_files: 
  - split: all
    path: revlogs/user_id=*/data.parquet
- config_name: cards
  data_files: 
  - split: all
    path: cards/user_id=*/data.parquet
- config_name: decks
  data_files: 
  - split: all
    path: decks/user_id=*/data.parquet
tags:
- memory
- spaced repetition
- knowledge tracing
pretty_name: Anki Revlogs 10K
size_categories:
- 100M<n<1B
---

# Introduction

Anki Revlogs 10K is a dataset of 10k collections from Anki for FSRS project. It is a random sample of collections with 5000+ revlog entries, so it should contain a mix of older (still active) users, and newer users.

The dataset contains three parts: revlogs, cards, and decks.

## Revlogs

This dataset contains flashcard review records with the following fields:

- **card_id**: Unique identifier for each flashcard
- **day_offset**: Number of days since the start of user's first review
- **rating**: User's rating of their recall performance (1: again, 2: hard, 3: good, 4: easy)
- **state**: Card's learning state (0: new, 1: learning, 2: review, 3: relearning)
- **duration**: Time spent on the card review in milliseconds (range: 0-60000)
- **elapsed_days**: Days since the last review (-1 for new cards)
- **elapsed_seconds**: Seconds since the last review (-1 for new cards)

The records have been pre-sorted in chronological order.

## Cards

This dataset contains card-note-deck relationship mappings with the following fields:

- **card_id**: Unique identifier for each flashcard
- **note_id**: Unique identifier for each note, where a note can contain multiple cards
- **deck_id**: Unique identifier for each deck, representing different study categories or subjects

## Decks

This dataset contains deck hierarchy information with the following fields:

- **deck_id**: Unique identifier for each deck
- **parent_id**: ID of the parent deck, indicating the deck's position in the hierarchy
- **preset_id**: ID of the preset configuration applied to the deck

# License

This dataset is released under the [anki-revlogs-10k License](LICENSE).

# Related Projects

[Anki Revlogs Dataset Builder](https://github.com/open-spaced-repetition/anki-revlogs-dataset-builder)

[SRS Benchmark](https://github.com/open-spaced-repetition/fsrs-benchmark)