Description #

Whitespace character normalizer - replaces different types of whitespace characters in text with standard spaces

Key features #

• Whitespace character recognition: Automatically identifies various Unicode whitespace characters
• Normalization processing: Replaces all whitespace characters with standard spaces

Application scenarios #

• Text preprocessing
• Data cleaning and normalization
• Format unification
• Text standardization

Technical features #

• Supports multiple types of whitespace characters: spaces, tabs, line breaks, full-width spaces, and more
• Intelligent processing: Retains text content and only replaces whitespace characters
• Leading and trailing cleanup: Automatically removes whitespace characters at the beginning and end of text
• Preserves structure: Does not alter the basic structure or content of the text

Operator parameters #

Input #

Output #

Normalized text column

Examples #

The following code demonstrates how to use daft to run the operator to normalize whitespace characters in text.

from __future__ import annotations

import os

import daft
from daft import col
from daft.las.functions.text.whitespace_normalizer import WhitespaceNormalizer
from daft.las.functions.udf import las_udf

if __name__ == "__main__":

    if os.getenv("DAFT_RUNNER", "native") == "ray":
        import logging

        import ray

        def configure_logging():
            logging.basicConfig(
                level=logging.INFO,
                format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
                datefmt="%Y-%m-%d %H:%M:%S.%s".format(),
            )
            logging.getLogger("tracing.span").setLevel(logging.WARNING)
            logging.getLogger("daft_io.stats").setLevel(logging.WARNING)
            logging.getLogger("DaftStatisticsManager").setLevel(logging.WARNING)
            logging.getLogger("DaftFlotillaScheduler").setLevel(logging.WARNING)
            logging.getLogger("DaftFlotillaDispatcher").setLevel(logging.WARNING)

        ray.init(dashboard_host="0.0.0.0", runtime_env={"worker_process_setup_hook": configure_logging})
        daft.set_runner_ray()
    daft.set_execution_config(actor_udf_ready_timeout=600)
    daft.set_execution_config(min_cpu_per_task=0)

    samples = {
        "text": [
            "Hello\u2000World\u2001Test",
            "中文\u2002文本\u2003测试",
            "English\u2004中文\u2005Mixed",
            "Multiple\u2006\u2007\u2008Spaces",
        ]
    }

    ds = daft.from_pydict(samples)
    ds = ds.with_column(
        "normalized_text",
        las_udf(WhitespaceNormalizer)(col("text")),
    )

    ds.show()
    # ╭──────────────────────────────────────────────┬──────────────────────────────────────────────╮
    # │ text                                         ┆ normalized_text                             │
    # │ ---                                          ┆ ---                                          │
    # │ Utf8                                         ┆ Utf8                                         │
    # ╞══════════════════════════════════════════════╪══════════════════════════════════════════════╡
    # │ Hello World Test                             ┆ Hello World Test                             │
    # ├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
    # │ 中文 文本 测试                                ┆ 中文 文本 测试                               │
    # ├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
    # │ English 中文 Mixed                            ┆ English 中文 Mixed                            │
    # ├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
    # │ Multiple   Spaces                            ┆ Multiple Spaces                              │
    # ╰──────────────────────────────────────────────┴──────────────────────────────────────────────╯