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e4b9a7b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | # -*- coding: utf-8 -*-
# SPDX-FileCopyrightText: 2016-2025 PyThaiNLP Project
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: Apache-2.0
# ruff: noqa: C901
from typing import List
def remove_repeated_ngrams(string_list: List[str], n: int = 2) -> List[str]:
"""
Remove repeated n-grams
:param List[str] string_list: List of string
:param int n: n-gram size
:return: List of string
:rtype: List[str]
:Example:
::
from pythainlp.lm import remove_repeated_ngrams
remove_repeated_ngrams(['เอา', 'เอา', 'แบบ', 'ไหน'], n=1)
# output: ['เอา', 'แบบ', 'ไหน']
"""
if not string_list or n <= 0:
return string_list
unique_ngrams = set()
output_list = []
for i in range(len(string_list)):
if i + n <= len(string_list):
ngram = tuple(string_list[i:i + n])
if ngram not in unique_ngrams:
unique_ngrams.add(ngram)
if not output_list or output_list[-(n - 1):] != list(ngram[:-1]):
output_list.extend(ngram)
else:
output_list.append(ngram[-1])
else:
for char in string_list[i:]:
if not output_list or output_list[-1] != char:
output_list.append(char)
return output_list
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