[FlaxSpeechEncoderDecoder] Fix input shape bug in weights init (#16728)

* [FlaxSpeechEncoderDecoder] Fix input shape bug in weights init

* make style

src/transformers/models/speech_encoder_decoder/modeling_flax_speech_encoder_decoder.py

@@ -226,11 +226,15 @@ class FlaxSpeechEncoderDecoderModule(nn.Module):
         else:
             self.enc_to_dec_proj = None
 
-    def _get_feat_extract_output_lengths(self, input_lengths: Union[jnp.ndarray, int]):
+    def _get_feat_extract_output_lengths(
+        self, input_lengths: Union[jnp.ndarray, int], add_adapter: Optional[bool] = None
+    ):
         """
         Computes the output length of the convolutional layers
         """
 
+        add_adapter = self.config.encoder.add_adapter if add_adapter is None else add_adapter
+
         def _conv_out_length(input_length, kernel_size, stride):
             # 1D convolutional layer output length formula taken
             # from https://pytorch.org/docs/stable/generated/torch.nn.Conv1d.html
@@ -239,6 +243,10 @@ class FlaxSpeechEncoderDecoderModule(nn.Module):
         for kernel_size, stride in zip(self.config.encoder.conv_kernel, self.config.encoder.conv_stride):
             input_lengths = _conv_out_length(input_lengths, kernel_size, stride)
 
+        if add_adapter:
+            for _ in range(self.config.encoder.num_adapter_layers):
+                input_lengths = _conv_out_length(input_lengths, 1, self.config.encoder.adapter_stride)
+
         return input_lengths
 
     def _get_encoder_module(self):
@@ -432,8 +440,10 @@ class FlaxSpeechEncoderDecoderModel(FlaxPreTrainedModel):
         )
         return unfreeze(init_variables["cache"])
 
-    def _get_feat_extract_output_lengths(self, input_lengths: Union[jnp.ndarray, int]):
-        return self.module._get_feat_extract_output_lengths(input_lengths)
+    def _get_feat_extract_output_lengths(
+        self, input_lengths: Union[jnp.ndarray, int], add_adapter: Optional[bool] = None
+    ):
+        return self.module._get_feat_extract_output_lengths(input_lengths, add_adapter=add_adapter)
 
     @add_start_docstrings(SPEECH_ENCODER_DECODER_ENCODE_INPUTS_DOCSTRING)
     @replace_return_docstrings(output_type=FlaxBaseModelOutput, config_class=_CONFIG_FOR_DOC)