1 files changed, 37 insertions, 0 deletions
diff --git a/text_recognizer/data/mappings/base.py b/text_recognizer/data/mappings/base.py
new file mode 100644
index 0000000..572ac95
--- /dev/null
+++ b/text_recognizer/data/mappings/base.py
@@ -0,0 +1,37 @@
+"""Mapping to and from word pieces."""
+from abc import ABC, abstractmethod
+from typing import Dict, List
+
+from torch import Tensor
+
+
+class AbstractMapping(ABC):
+    def __init__(
+        self, input_size: List[int], mapping: List[str], inverse_mapping: Dict[str, int]
+    ) -> None:
+        self.input_size = input_size
+        self.mapping = mapping
+        self.inverse_mapping = inverse_mapping
+
+    def __len__(self) -> int:
+        return len(self.mapping)
+
+    @property
+    def num_classes(self) -> int:
+        return self.__len__()
+
+    @abstractmethod
+    def get_token(self, *args, **kwargs) -> str:
+        ...
+
+    @abstractmethod
+    def get_index(self, *args, **kwargs) -> Tensor:
+        ...
+
+    @abstractmethod
+    def get_text(self, *args, **kwargs) -> str:
+        ...
+
+    @abstractmethod
+    def get_indices(self, *args, **kwargs) -> Tensor:
+        ...