mirror of
https://github.com/ilri/csv-metadata-quality.git
synced 2024-11-22 13:55:03 +01:00
Alan Orth
f6018c51b6
Apply recommended fix from fixit:
RewriteToLiteral: It's slower to call list() than using the empty literal, because the name list must
be looked up in the global scope in case it has been rebound.
100 lines
3.8 KiB
Python
100 lines
3.8 KiB
Python
# SPDX-License-Identifier: GPL-3.0-only
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import re
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import langid
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import pandas as pd
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from colorama import Fore
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from pycountry import languages
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def correct_language(row, exclude):
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"""Analyze the text used in the title, abstract, and citation fields to pre-
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dict the language being used and compare it with the item's dc.language.iso
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field.
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Function prints an error if the language field does not match the detected
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language and returns the value in the language field if it does match.
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"""
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# Initialize some variables at global scope so that we can set them in the
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# loop scope below and still be able to access them afterwards.
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language = ""
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sample_strings = []
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title = None
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# Iterate over the labels of the current row's values. Before we transposed
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# the DataFrame these were the columns in the CSV, ie dc.title and dc.type.
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for label in row.axes[0]:
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# Skip fields with missing values
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if pd.isna(row[label]):
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continue
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# Check if current row has multiple language values (separated by "||")
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match = re.match(r"^.*?language.*$", label)
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if match is not None:
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# Skip fields with multiple language values
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if "||" in row[label]:
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return
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language = row[label]
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# Extract title if it is present (note that we don't allow excluding
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# the title here because it complicates things).
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match = re.match(r"^.*?title.*$", label)
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if match is not None:
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title = row[label]
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# Append title to sample strings
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sample_strings.append(row[label])
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# Extract abstract if it is present
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match = re.match(r"^.*?abstract.*$", label)
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if match is not None and label not in exclude:
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sample_strings.append(row[label])
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# Extract citation if it is present
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match = re.match(r"^.*?[cC]itation.*$", label)
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if match is not None and label not in exclude:
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sample_strings.append(row[label])
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# Make sure language is not blank and is valid ISO 639-1/639-3 before proceeding with language prediction
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if language != "":
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# Check language value like "es"
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if len(language) == 2:
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if not languages.get(alpha_2=language):
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return
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# Check language value like "spa"
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elif len(language) == 3:
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if not languages.get(alpha_3=language):
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return
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# Language value is something else like "Span", do not proceed
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else:
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return
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# Language is blank, do not proceed
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else:
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return
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# Concatenate all sample strings into one string
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sample_text = " ".join(sample_strings)
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# Restrict the langid detection space to reduce false positives
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langid.set_languages(
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["ar", "de", "en", "es", "fr", "hi", "it", "ja", "ko", "pt", "ru", "vi", "zh"]
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)
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langid_classification = langid.classify(sample_text)
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# langid returns an ISO 639-1 (alpha 2) representation of the detected language, but the current item's language field might be ISO 639-3 (alpha 3) so we should use a pycountry Language object to compare both represenations and give appropriate error messages that match the format used by in the input file.
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detected_language = languages.get(alpha_2=langid_classification[0])
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if len(language) == 2 and language != detected_language.alpha_2:
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print(
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f"{Fore.YELLOW}Possibly incorrect language {language} (detected {detected_language.alpha_2}): {Fore.RESET}{title}"
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)
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elif len(language) == 3 and language != detected_language.alpha_3:
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print(
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f"{Fore.YELLOW}Possibly incorrect language {language} (detected {detected_language.alpha_3}): {Fore.RESET}{title}"
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)
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else:
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return
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