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chartensorizer.py
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chartensorizer.py
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import numpy as np
from typing import Optional
__all__ = ['CharTensorizer']
class CharTensorizer:
"""Tensorize strings into characters"""
def __init__(self, max_num_chars: Optional[int], lower_case_all: bool, include_space: bool):
self.__max_num_chars = max_num_chars
self.__lower_case_all = lower_case_all
self.__ALPHABET = "abcdefghijklmnopqrstuvwxyz0123456789,;.!?:'\"/\\|_@#$%^&*~`+-=<>()[]{}"
if not self.__lower_case_all:
self.__ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + self.__ALPHABET
if include_space:
self.__ALPHABET += ' '
self.__ALPHABET_DICT = {char: idx + 2 for (idx, char) in enumerate(self.__ALPHABET)} # "0" is PAD, "1" is UNK
self.__ALPHABET_DICT['PAD'] = 0
self.__ALPHABET_DICT['UNK'] = 1
@property
def max_char_length(self) -> Optional[int]:
return self.__max_num_chars
def num_chars_in_vocabulary(self)-> int:
return len(self.__ALPHABET_DICT)
def __get_char_idx(self, character: str) -> int:
idx = self.__ALPHABET_DICT.get(character)
if idx is not None:
return idx
return self.__ALPHABET_DICT['UNK']
def get_word_from_ids(self, ids: np.ndarray)-> str:
return ''.join(self.__ALPHABET[i] if i!=1 else '<UNK>' for i in ids)
def tensorize_str(self, input: str) -> np.ndarray:
if self.__lower_case_all:
input = input.lower()
def char_iterator():
for i, c in enumerate(input):
if self.__max_num_chars is not None and i >= self.__max_num_chars:
break
yield self.__get_char_idx(c)
if self.__max_num_chars is not None and len(input) < self.__max_num_chars:
pad_id = self.__get_char_idx('PAD')
yield from (pad_id for _ in range(self.__max_num_chars - len(input)))
return np.fromiter(char_iterator(), dtype=np.uint8)