add files

funasr_local/models/encoder/abs_encoder.py

@@ -0,0 +1,21 @@
+from abc import ABC
+from abc import abstractmethod
+from typing import Optional
+from typing import Tuple
+
+import torch
+
+
+class AbsEncoder(torch.nn.Module, ABC):
+    @abstractmethod
+    def output_size(self) -> int:
+        raise NotImplementedError
+
+    @abstractmethod
+    def forward(
+        self,
+        xs_pad: torch.Tensor,
+        ilens: torch.Tensor,
+        prev_states: torch.Tensor = None,
+    ) -> Tuple[torch.Tensor, torch.Tensor, Optional[torch.Tensor]]:
+        raise NotImplementedError