Duplicate from edugp/kenlm

Co-authored-by: Eduardo Gonzalez Ponferrada <edugp@users.noreply.huggingface.co>

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LICENSE

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+
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README.md

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+---
+language:
+- es
+- af
+- ar
+- arz
+- as
+- bn
+- fr
+- sw
+- eu
+- ca
+- zh
+- en
+- hi
+- ur
+- id
+- pt
+- vi
+- gu
+- kn
+- ml
+- mr
+- ta
+- te
+- yo
+tags:
+- kenlm
+- perplexity
+- n-gram
+- kneser-ney
+- bigscience
+license: mit
+datasets:
+- wikipedia
+- oscar
+duplicated_from: edugp/kenlm
+---
+
+# KenLM models
+This repo contains several KenLM models trained on different tokenized datasets and languages.  
+KenLM models are probabilistic n-gram languge models that models. One use case of these models consist on fast perplexity estimation for [filtering or sampling large datasets](https://huggingface.co/bertin-project/bertin-roberta-base-spanish). For example, one could use a KenLM model trained on French Wikipedia to run inference on a large dataset and filter out samples that are very unlike to appear on Wikipedia (high perplexity), or very simple non-informative sentences that could appear repeatedly (low perplexity).
+
+At the root of this repo you will find different directories named after the dataset models were trained on (e.g. `wikipedia`, `oscar`). Within each directory, you will find several models trained on different language subsets of the dataset (e.g. `en (English)`, `es (Spanish)`, `fr (French)`). For each language you will find three different files
+* `{language}.arpa.bin`: The trained KenLM model binary
+* `{language}.sp.model`: The trained SentencePiece model used for tokenization
+* `{language}.sp.vocab`: The vocabulary file for the SentencePiece model
+
+The models have been trained using some of the preprocessing steps from [cc_net](https://github.com/facebookresearch/cc_net), in particular replacing numbers with zeros and normalizing punctuation. So, it is important to keep the default values for the parameters: `lower_case`, `remove_accents`, `normalize_numbers` and `punctuation` when using the pre-trained models in order to replicate the same pre-processing steps at inference time.
+
+# Dependencies
+* KenLM: `pip install https://github.com/kpu/kenlm/archive/master.zip`
+* SentencePiece: `pip install sentencepiece`
+
+# Example:
+```
+from model import KenlmModel
+
+
+# Load model trained on English wikipedia
+model = KenlmModel.from_pretrained("wikipedia", "en")
+
+# Get perplexity
+model.get_perplexity("I am very perplexed")
+# 341.3 (low perplexity, since sentence style is formal and with no grammar mistakes)
+
+model.get_perplexity("im hella trippin")
+# 46793.5 (high perplexity, since the sentence is colloquial and contains grammar mistakes)
+```
+In the example above we see that, since Wikipedia is a collection of encyclopedic articles, a KenLM model trained on it will naturally give lower perplexity scores to sentences with formal language and no grammar mistakes than colloquial sentences with grammar mistakes.

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model.py

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+import os
+import re
+import unicodedata
+from typing import Dict
+
+import kenlm
+import sentencepiece
+from huggingface_hub import cached_download, hf_hub_url
+
+
+class SentencePiece:
+    def __init__(
+        self,
+        model: str,
+    ):
+        super().__init__()
+        self.sp = sentencepiece.SentencePieceProcessor()
+        self.sp.load(str(model))
+
+    def do(self, text: dict) -> dict:
+        tokenized = self.sp.encode_as_pieces(text)
+        return " ".join(tokenized)
+
+
+class KenlmModel:
+    digit_re: re.Pattern = re.compile(r"\d")
+    unicode_punct: Dict[str, str] = {
+        "，": ",",
+        "。": ".",
+        "、": ",",
+        "„": '"',
+        "”": '"',
+        "“": '"',
+        "«": '"',
+        "»": '"',
+        "１": '"',
+        "」": '"',
+        "「": '"',
+        "《": '"',
+        "》": '"',
+        "´": "'",
+        "∶": ":",
+        "：": ":",
+        "？": "?",
+        "！": "!",
+        "（": "(",
+        "）": ")",
+        "；": ";",
+        "–": "-",
+        "—": " - ",
+        "．": ". ",
+        "～": "~",
+        "’": "'",
+        "…": "...",
+        "━": "-",
+        "〈": "<",
+        "〉": ">",
+        "【": "[",
+        "】": "]",
+        "％": "%",
+        "►": "-",
+    }
+    unicode_punct_re = re.compile(f"[{''.join(unicode_punct.keys())}]")
+    non_printing_chars_re = re.compile(
+        f"[{''.join(map(chr, list(range(0,32)) + list(range(127,160))))}]"
+    )
+    kenlm_model_dir = None
+    sentence_piece_model_dir = None
+
+    def __init__(
+        self,
+        model_dataset: str,
+        language: str,
+        lower_case: bool = False,
+        remove_accents: bool = False,
+        normalize_numbers: bool = True,
+        punctuation: int = 1,
+    ):
+        self.model = kenlm.Model(os.path.join(model_dataset, f"{language}.arpa.bin"))
+        self.tokenizer = SentencePiece(os.path.join(model_dataset, f"{language}.sp.model"))
+        self.accent = remove_accents
+        self.case = lower_case
+        self.numbers = normalize_numbers
+        self.punct = punctuation
+
+    @classmethod
+    def from_pretrained(
+        cls,
+        model_dataset: str,
+        language: str,
+    ):
+        return cls(
+            model_dataset,
+            language,
+            False,
+            False,
+            True,
+            1,
+        )
+
+    def pp(self, log_score, length):
+        return 10.0 ** (-log_score / length)
+
+    def get_perplexity(self, doc: str, normalize_cc_net: bool = True):
+        if normalize_cc_net:
+            doc = self.normalize(
+                doc,
+                accent=self.accent,
+                case=self.case,
+                numbers=self.numbers,
+                punct=self.punct,
+            )
+        # Tokenize (after normalizing): See https://github.com/facebookresearch/cc_net/blob/bda555bd1cf1ee2e0b925363e62a61cd46c8b60d/cc_net/mine.py#L352 for full pipeline
+        doc = self.tokenizer.do(doc)
+        doc_log_score, doc_length = 0, 0
+        for line in doc.split("\n"):
+            log_score = self.model.score(line)
+            length = len(line.split()) + 1
+            doc_log_score += log_score
+            doc_length += length
+        return round(self.pp(doc_log_score, doc_length), 1)
+
+    def normalize(
+        self,
+        line: str,
+        accent: bool = True,
+        case: bool = True,
+        numbers: bool = True,
+        punct: int = 1,
+    ) -> str:
+        line = line.strip()
+        if not line:
+            return line
+        if case:
+            line = line.lower()
+        if accent:
+            line = self.strip_accents(line)
+        if numbers:
+            line = self.digit_re.sub("0", line)
+        if punct == 1:
+            line = self.replace_unicode_punct(line)
+        elif punct == 2:
+            line = self.remove_unicode_punct(line)
+        line = self.remove_non_printing_char(line)
+        return line
+
+    def strip_accents(self, line: str) -> str:
+        """Strips accents from a piece of text."""
+        nfd = unicodedata.normalize("NFD", line)
+        output = [c for c in nfd if unicodedata.category(c) != "Mn"]
+        if len(output) == line:
+            return line
+        return "".join(output)
+
+    def replace_unicode_punct(self, text: str) -> str:
+        return "".join(self.unicode_punct.get(c, c) for c in text)
+
+    def remove_unicode_punct(self, text: str) -> str:
+        """More aggressive version of replace_unicode_punct but also faster."""
+        return self.unicode_punct_re.sub("", text)
+
+    def remove_non_printing_char(self, text: str) -> str:
+        return self.non_printing_chars_re.sub("", text)

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