add files

funasr_local/models/postencoder/abs_postencoder.py

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+from abc import ABC
+from abc import abstractmethod
+from typing import Tuple
+
+import torch
+
+
+class AbsPostEncoder(torch.nn.Module, ABC):
+    @abstractmethod
+    def output_size(self) -> int:
+        raise NotImplementedError
+
+    @abstractmethod
+    def forward(
+        self, input: torch.Tensor, input_lengths: torch.Tensor
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        raise NotImplementedError