add files

funasr_local/models/specaug/abs_specaug.py

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+from typing import Optional
+from typing import Tuple
+
+import torch
+
+
+class AbsSpecAug(torch.nn.Module):
+    """Abstract class for the augmentation of spectrogram
+
+    The process-flow:
+
+    Frontend  -> SpecAug -> Normalization -> Encoder -> Decoder
+    """
+
+    def forward(
+        self, x: torch.Tensor, x_lengths: torch.Tensor = None
+    ) -> Tuple[torch.Tensor, Optional[torch.Tensor]]:
+        raise NotImplementedError