ray.data.read_text#

ray.data.read_text(paths: str | List[str], *, encoding: str = 'utf-8', drop_empty_lines: bool = True, filesystem: pyarrow.fs.FileSystem | None = None, parallelism: int = -1, ray_remote_args: Dict[str, Any] | None = None, arrow_open_stream_args: Dict[str, Any] | None = None, meta_provider: BaseFileMetadataProvider | None = None, partition_filter: PathPartitionFilter | None = None, partitioning: Partitioning = None, include_paths: bool = False, ignore_missing_paths: bool = False, shuffle: Literal['files'] | FileShuffleConfig | None = None, file_extensions: List[str] | None = None, concurrency: int | None = None, override_num_blocks: int | None = None) → Dataset[source]#

Create a Dataset from lines stored in text files.

Examples

Read a file in remote storage.

>>> import ray
>>> ds = ray.data.read_text("s3://anonymous@ray-example-data/this.txt")
>>> ds.schema()
Column  Type
------  ----
text    string

Read multiple local files.

>>> ray.data.read_text( 
...    ["local:///path/to/file1", "local:///path/to/file2"])
Parameters:

  • paths – A single file or directory, or a list of file or directory paths. A list of paths can contain both files and directories.

  • encoding – The encoding of the files (e.g., “utf-8” or “ascii”).

  • filesystem – The PyArrow filesystem implementation to read from. These filesystems are specified in the PyArrow docs. Specify this parameter if you need to provide specific configurations to the filesystem. By default, the filesystem is automatically selected based on the scheme of the paths. For example, if the path begins with s3://, the S3FileSystem is used.

  • parallelism – This argument is deprecated. Use override_num_blocks argument.

  • ray_remote_args – kwargs passed to ray.remote() in the read tasks and in the subsequent text decoding map task.

  • arrow_open_stream_args – kwargs passed to pyarrow.fs.FileSystem.open_input_file. when opening input files to read.

  • meta_provider – [Deprecated] A file metadata provider. Custom metadata providers may be able to resolve file metadata more quickly and/or accurately. In most cases, you do not need to set this. If None, this function uses a system-chosen implementation.

  • partition_filter – A PathPartitionFilter. Use with a custom callback to read only selected partitions of a dataset. By default, no files are filtered.

  • partitioning – A Partitioning object that describes how paths are organized. Defaults to None.

  • include_paths – If True, include the path to each file. File paths are stored in the 'path' column.

  • ignore_missing_paths – If True, ignores any file paths in paths that are not found. Defaults to False.

  • shuffle – If setting to “files”, randomly shuffle input files order before read. If setting to FileShuffleConfig, you can pass a seed to shuffle the input files. Defaults to not shuffle with None.

  • file_extensions – A list of file extensions to filter files by.

  • concurrency – The maximum number of Ray tasks to run concurrently. Set this to control number of tasks to run concurrently. This doesn’t change the total number of tasks run or the total number of output blocks. By default, concurrency is dynamically decided based on the available resources.

  • override_num_blocks – Override the number of output blocks from all read tasks. By default, the number of output blocks is dynamically decided based on input data size and available resources. You shouldn’t manually set this value in most cases.

Returns:

Dataset producing lines of text read from the specified paths.