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authorGustaf Rydholm <gustaf.rydholm@gmail.com>2021-10-27 22:10:14 +0200
committerGustaf Rydholm <gustaf.rydholm@gmail.com>2021-10-27 22:10:14 +0200
commit07a5b84b001756b06c6dc0c54f396ea42b11067b (patch)
treed878d498d7bd4aebab1194e6d9851dc16e0b6b8e /text_recognizer/data/mappings/emnist_mapping.py
parenteb672fa209d4a34124cce06bd8737164647a2b1b (diff)
Rename mappings
Diffstat (limited to 'text_recognizer/data/mappings/emnist_mapping.py')
-rw-r--r--text_recognizer/data/mappings/emnist_mapping.py60
1 files changed, 0 insertions, 60 deletions
diff --git a/text_recognizer/data/mappings/emnist_mapping.py b/text_recognizer/data/mappings/emnist_mapping.py
deleted file mode 100644
index 3eed3d8..0000000
--- a/text_recognizer/data/mappings/emnist_mapping.py
+++ /dev/null
@@ -1,60 +0,0 @@
-"""Emnist mapping."""
-from typing import List, Optional, Set, Union
-
-import torch
-from torch import Tensor
-
-from text_recognizer.data.mappings.base_mapping import AbstractMapping
-from text_recognizer.data.emnist import emnist_mapping
-
-
-class EmnistMapping(AbstractMapping):
- """Mapping for EMNIST labels."""
-
- def __init__(
- self, extra_symbols: Optional[Set[str]] = None, lower: bool = True
- ) -> None:
- self.extra_symbols = set(extra_symbols) if extra_symbols is not None else None
- self.mapping, self.inverse_mapping, self.input_size = emnist_mapping(
- self.extra_symbols
- )
- if lower:
- self._to_lower()
- super().__init__(self.input_size, self.mapping, self.inverse_mapping)
-
- def _to_lower(self) -> None:
- """Converts mapping to lowercase letters only."""
-
- def _filter(x: int) -> int:
- if 40 <= x:
- return x - 26
- return x
-
- self.inverse_mapping = {v: _filter(k) for k, v in enumerate(self.mapping)}
- self.mapping = [c for c in self.mapping if not c.isupper()]
-
- def get_token(self, index: Union[int, Tensor]) -> str:
- """Returns token for index value."""
- if (index := int(index)) <= len(self.mapping):
- return self.mapping[index]
- raise KeyError(f"Index ({index}) not in mapping.")
-
- def get_index(self, token: str) -> Tensor:
- """Returns index value of token."""
- if token in self.inverse_mapping:
- return torch.LongTensor([self.inverse_mapping[token]])
- raise KeyError(f"Token ({token}) not found in inverse mapping.")
-
- def get_text(self, indices: Union[List[int], Tensor]) -> str:
- """Returns the text from a list of indices."""
- if isinstance(indices, Tensor):
- indices = indices.tolist()
- return "".join([self.mapping[index] for index in indices])
-
- def get_indices(self, text: str) -> Tensor:
- """Returns tensor of indices for a string."""
- return Tensor([self.inverse_mapping[token] for token in text])
-
- def __getitem__(self, x: Union[int, Tensor]) -> str:
- """Returns text for a list of indices."""
- return self.get_token(x)