DataTrove

DataTrove is a library to process, filter and deduplicate text data at a very large scale. It provides a set of prebuilt commonly used processing blocks with a framework to easily add custom functionality.

DataTrove processing pipelines are platform-agnostic, running out of the box locally or on a slurm cluster. Its (relatively) low memory usage and multiple step design makes it ideal for large workloads, such as to process an LLM's training data.

Local, remote and other file systems are supported through fsspec.

Installation

git clone git@github.com:huggingface/datatrove.git && cd datatrove
pip install -e ".[FLAVOUR]"

Available flavours (combine them with , i.e. [processing,s3]:

• all installs everything
• io dependencies to read warc/arc/wet files and arrow/parquet formats
• processing dependencies for text extraction, filtering and tokenization
• s3 s3 support
• cli for command line tools

Quickstart examples

You can check the following examples:

• process_common_crawl_dump.py full pipeline to read commoncrawl warc files, extract their text content, filters and save the resulting data to s3. Runs on slurm
• tokenize_c4.py reads data directly from huggingface's hub to tokenize the english portion of the C4 dataset using the gpt2 tokenizer
• minhash_deduplication.py full pipeline to run minhash deduplication of text data
• sentence_deduplication.py example to run sentence level exact deduplication
• exact_substrings.py example to run ExactSubstr (requires this repo

Pipeline

DataTrove Document

Each pipeline block processes data in the datatrove Document format:

• text the actual text content for each sample
• id a unique id (string) for this sample
• metadata a dictionary where any additional info may be stored

Types of pipeline blocks

Each pipeline block takes a generator of Document as input and returns another generator of Document.

• readers read data from different formats and yield Document
• writers save Document to disk/cloud in different formats
• extractors extract text content from raw formats (such as webpage html)
• filters filter out (remove) some Documents based on specific rules/criteria
• stats blocks to collect statistics on the dataset
• tokens blocks to tokenize data or count tokens
• dedup blocks for deduplication

Full pipeline

A pipeline is defined as a list of pipeline blocks. As an example, the following pipeline would read data from disk, randomly filter (remove) some documents and write them back to disk:

from datatrove.pipeline.readers import CSVReader
from datatrove.pipeline.filters import SamplerFilter
from datatrove.pipeline.writers import JsonlWriter

pipeline = [
    CSVReader(
        data_folder="/my/input/path"
    ),
    SamplerFilter(rate=0.5),
    JsonlWriter(
        output_folder="/my/output/path"
    )
]

Executors

Pipelines are platform-agnostic, which means that the same pipeline can smoothly run on different execution environments without any changes to its steps. Each environment has its own PipelineExecutor. Some options common to all executors:

• pipeline a list consisting of the pipeline steps that should be run
• logging_dir a datafolder where log files, statistics and more should be saved
• skip_completed (bool, True by default) datatrove keeps track of completed tasks so that when you relaunch a job they can be skipped. Set this to False to disable this behaviour

Call an executor's run method to execute its pipeline.

LocalPipelineExecutor

This executor will launch a pipeline on a local machine. Options:

• tasks total number of tasks to run
• workers how many tasks to run simultaneously. If -1, no limit. Anything > 1 will use multiprocessing to execute the tasks.
• start_method method to use to spawn a multiprocessing Pool. Ignored if workers is 1

Example executor

from datatrove.executor import LocalPipelineExecutor
executor = LocalPipelineExecutor(
    pipeline=[
        ...
    ],
    logging_dir="logs/",
    tasks=10,
    workers=5
)
executor.run()

SlurmPipelineExecutor

This executor will launch a pipeline on a slurm cluster, using slurm job arrays to group and manage tasks. Options:

• tasks total number of tasks to run. required
• time slurm time limit string. required
• partition slurm partition. required
• workers how many tasks to run simultaneously. If -1, no limit. Slurm will run workers tasks at a time. (default: -1)
• job_name slurm job name (default: "data_processing)
• depends another SlurmPipelineExecutor instance, which will be a dependency of this pipeline (current pipeline will only start executing after the depended on pipeline successfully completes)
• sbatch_args dictionary with any other arguments you would like to pass to sbatch
• slurm_logs_folder where to save the slurm log files. If using a local path for logging_dir, they will be saved on logging_dir/slurm_logs. If not, they will be saved as a subdir of the current directory.

Other options

• cpus_per_task how many cpus to give each task (default: 1)
• qos slurm qos (default: "normal")
• mem_per_cpu_gb memory per cpu, in GB (default: 2)
• env_command custom command to activate a python environment, if needed
• condaenv conda environment to activate
• venv_path path to a python environment to activate
• max_array_size the MaxArraySize value in $ scontrol show config. If number of tasks exceeds this number, it will split into multiple array jobs (default: 1001)
• max_array_launch_parallel if we need multiple jobs due to max_array_size, whether to launch them all in one go (parallel) or sequentially (default: False)
• stagger_max_array_jobs when max_array_launch_parallel is True, this determines how many seconds to wait between launching each of the parallel jobs (default: 0)
• run_on_dependency_fail start executing when a job we depend on finishes even if it has failed (default: False)
• randomize_start randomize the start of each task in a job in a ~3 min window. Useful when heavily hitting an s3 bucket for example. (default: False)

Example executor

from datatrove.executor import SlurmPipelineExecutor
executor1 = SlurmPipelineExecutor(
    pipeline=[
        ...
    ],
    job_name="my_cool_job1",
    logging_dir="logs/job1",
    tasks=500,
    workers=100,  # omit to run all at once
    time="10:00:00",  # 10 hours
    partition="hopper-cpu"
)
executor2 = SlurmPipelineExecutor(
    pipeline=[
        ...
    ],
    job_name="my_cool_job2",
    logging_dir="logs/job2",
    tasks=1,
    time="5:00:00",  # 5 hours
    partition="hopper-cpu",
    depends=executor1  # this pipeline will only be launched after executor1 successfuly completes
)
# executor1.run()
executor2.run() # this will actually launch executor1, as it is a dependency, so no need to launch it explicitly

Logging

For a pipeline with logging_dir mylogspath/exp1, the following folder structure would be created:

See folder structure

└── mylogspath/exp1
    │── executor.json ⟵ json dump of the executor options and pipeline steps
    │── launch_script.slurm ⟵ the slurm config created and used to launch this job (if running on slurm)
    │── executor.pik ⟵ the slurm config created and used to launch this job (if running on slurm)
    │── ranks_to_run.json ⟵ list of tasks that are being run
    │── logs/
    │   └──[task_00000.log, task_00001.log, task_00002.log, ...] ⟵ individual logging files for each task
    │── completions/
    │   └──[00004, 00007, 00204, ...] ⟵ empty files marking a task as completed. Using when relaunching/resuming a job (only unfinished tasks will be run)
    │── stats/
    │   └──[00000.json, 00001.json, 00002.json, ...] ⟵ individual stats for each task (number of samples processed, filtered, removed, etc)
    └── stats.json ⟵ global stats from all tasks

DataFolder / paths

Datatrove supports a wide variety of input/output sources through fsspec.

There are a few ways to provide a path to a datatrove block (for input_folder, logging_dir, data_folder and so on arguments):

• str: the simplest way is to pass a single string. Example: /home/user/mydir, s3://mybucket/myinputdata, hf://datasets/allenai/c4/en/

• (str, fsspec filesystem instance): a string path and a fully initialized filesystem object. Example: ("s3://mybucket/myinputdata", S3FileSystem(client_kwargs={"endpoint_url": endpoint_uri}))

• (str, dict): a string path and a dictionary with options to initialize a fs. Example (equivalent to the previous line): ("s3://mybucket/myinputdata", {"client_kwargs": {"endpoint_url": endpoint_uri}})

• DataFolder: you can initialize a DataFolder object directly and pass it as an argument

Under the hood these argument combinations are parsed by get_datafolder.

Practical guides

Reading data

Usually, pipelines will start with a Reader block. Most readers take a data_folder argument — a path to a folder containing the data to be read.

These files will be distributed across each task. If you have N tasks, task with rank i (0-based) will process files i, i+N, i+2N, i+3N,....

Internally, each reader reads data and converts it into a dictionary before creating a Document object.

Some options common to most readers:

• text_key the dictionary key containing the text content for each sample. Default: text
• id_key the dictionary key containing the id for each sample. Default: id
• default_metadata a dictionary for any default metadata values you would like to add (such as their source, for example)
• recursive whether to look for files recursively in data_folder's subdirectories
• glob_pattern use this field to match specific files. For instance, glob_pattern="*/warc/*.warc.gz" will match files with a .warc.gz file extension on the warc/ folder of each of the data_folder's subdirectories
• adapter this function takes the raw dictionary obtained from the reader and returns a dictionary with Document's field names. You may overwrite this function (_default_adapter) if you would like.
• limit read only a certain number of samples. Useful for testing/debugging

Extracting text

You can use extractors to extract text content from raw html. The most commonly used extractor in datatrove is Trafilatura, which uses the trafilatura library.

Filtering data

Filters are some of the most important blocks of any data processing pipeline. Datatrove's filter blocks take a Document and return a boolean (True to keep a document, False to remove it). Removed samples do not continue to the next pipeline stage. You can also save the removed samples to disk by passing a Writer to the excluded_writer parameter.

Saving data

Once you are done processing your data you will probably want to save it somewhere. For this you can use a writer. Writers require an output_folder (the path where data should be saved). You can choose the compression to use (default: gzip) and the filename to save each file as. For the output_filename, a template is applied using the following arguments:

• ${rank} replaced with the current task's rank. Note that if this tag isn't present, different tasks may try to write to the same location
• ${id} replaced with the sample id
• metadata: any other ${tag} will be replaced with the corresponding document.metadata['tag'] value

An example to separate samples by language based on their lang metadata field:

JsonlWriter(
    f"{MAIN_OUTPUT_PATH}/non_english/",
    output_filename="${language}/" + DUMP + "/${rank}.jsonl.gz",  # folder structure: language/dump/file
)

Deduplicating data

For deduplication check the examples minhash_deduplication.py, sentence_deduplication.py and exact_substrings.py.

Contributing

pip install -e ".[dev]"

Install pre-commit code style hooks:

pre-commit install

Run the tests:

pytest -sv ./tests/