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"""
Simple categorical encoder
Authors:
Leo 2022
"""
from typing import List
class CategoryEncoder:
def __init__(self, category: List[str]) -> None:
self.category = list(sorted(set(category)))
def __len__(self) -> int:
return len(self.category)
def encode(self, label: str) -> int:
return self.category.index(label)
def decode(self, index: int) -> str:
return self.category[index]
class CategoryEncoders:
def __init__(self, categories: List[List[str]]) -> None:
self.categories = [CategoryEncoder(c) for c in categories]
def __len__(self) -> int:
return sum([len(c) for c in self.categories])
def __iter__(self):
for category in self.categories:
yield category
def encode(self, labels: List[str]) -> List[int]:
assert len(labels) == len(self.categories)
return [
encoder.encode(label) for label, encoder in zip(labels, self.categories)
]
def decode(self, indices: List[int]) -> List[str]:
return [
encoder.decode(index) for index, encoder in zip(indices, self.categories)
]
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