Demos

July 27, 2026 ยท View on GitHub

This folder contains both interactive demos for experiencing Data-Juicer and functional examples that demonstrate specific features and workflows.

Sample datasets used by the demos and examples are available in the data subdirectory.

Interactive Demos

Run an interactive demo with its app.py:

cd <subdir_of_demos>
streamlit run app.py
  • Overview scan (overview_scan)

    • This demo introduces the basic concepts and functions of Data-Juicer, such as features, configuration, operators, and so on.
  • Data process loop (data_process_loop)

    • This demo analyzes and processes a dataset, providing a comparison of statistical information before and after the processing.
  • Data visualization diversity (data_visualization_diversity)

    • This demo analyzes the verb-noun structure of the CFT dataset and plots its diversity in sunburst format.
  • Data visualization op effect (data_visualization_op_effect)

    • This demo analyzes the statistics of dataset, and displays the effect of each Filter op by setting different thresholds.
  • Data visualization statistics (data_visualization_statistics)

    • This demo analyzes the dataset and obtain up to 13 statistics.
  • Process CFT Chinese data (process_cft_zh_data)

    • This demos analyzes and processes part of Chinese dataset in Alpaca-CoT to show how to process IFT or CFT data for LLM fine-tuning.
  • Process SCI data (process_sci_data)

    • This demos analyzes and processes part of arXiv dataset to show how to process scientific literature data for LLM pre-training.
  • Process code data (process_code_data)

    • This demos analyzes and processes part of Stack-Exchange dataset to show how to process code data for LLM pre-training.
  • Text quality classifier (tool_quality_classifier)

    • This demo provides 3 text quality classifier to score the dataset.
  • Dataset splitting by language (tool_dataset_splitting_by_language)

    • This demo splits a dataset to different sub-datasets by language.
  • Data mixture (data_mixture)

    • This demo selects and mixes samples from multiple datasets and exports them into a new dataset.

Functional Examples

Follow the instructions in the corresponding subdirectory to run these examples.

  • Partition and checkpoint (partition_and_checkpoint)

    • This demo showcases distributed processing with partitioning, checkpointing, and event logging. It demonstrates the new job management features including resource-aware partitioning, comprehensive event logging, and the processing snapshot utility for monitoring job progress.
  • Elastic sharding (elastic_sharding)

    • This demo pre-splits a JSONL dataset, launches any number of DLC workers with one command, dynamically claims shards through a shared POSIX filesystem, and processes each claimed shard with node-local Ray. It includes CPU-only and mixed CPU/GPU recipes.