fix cnn cache dy2st shape

paddlespeech/s2t/models/u2/u2.py

@@ -29,6 +29,9 @@ import paddle
 from paddle import jit
 from paddle import nn
 
+from paddlespeech.audio.utils.tensor_utils import add_sos_eos
+from paddlespeech.audio.utils.tensor_utils import pad_sequence
+from paddlespeech.audio.utils.tensor_utils import th_accuracy
 from paddlespeech.s2t.decoders.scorers.ctc import CTCPrefixScorer
 from paddlespeech.s2t.frontend.utility import IGNORE_ID
 from paddlespeech.s2t.frontend.utility import load_cmvn
@@ -48,9 +51,6 @@ from paddlespeech.s2t.utils import checkpoint
 from paddlespeech.s2t.utils import layer_tools
 from paddlespeech.s2t.utils.ctc_utils import remove_duplicates_and_blank
 from paddlespeech.s2t.utils.log import Log
-from paddlespeech.audio.utils.tensor_utils import add_sos_eos
-from paddlespeech.audio.utils.tensor_utils import pad_sequence
-from paddlespeech.audio.utils.tensor_utils import th_accuracy
 from paddlespeech.s2t.utils.utility import log_add
 from paddlespeech.s2t.utils.utility import UpdateConfig
 
@@ -625,12 +625,10 @@ class U2BaseModel(ASRInterface, nn.Layer):
                 (elayers, head, cache_t1, d_k * 2), where
                 `head * d_k == hidden-dim` and
                 `cache_t1 == chunk_size * num_decoding_left_chunks`.
-                `d_k * 2` for att key & value. Default is 0-dims Tensor, 
+                `d_k * 2` for att key & value. 
-                it is used for dy2st.
             cnn_cache (paddle.Tensor): cache tensor for cnn_module in conformer,
                 (elayers, b=1, hidden-dim, cache_t2), where
-                `cache_t2 == cnn.lorder - 1`. Default is 0-dims Tensor, 
+                `cache_t2 == cnn.lorder - 1`. 
-                it is used for dy2st.
                 
         Returns:
             paddle.Tensor: output of current input xs,
@@ -641,8 +639,8 @@ class U2BaseModel(ASRInterface, nn.Layer):
             paddle.Tensor: new conformer cnn cache required for next chunk, with
                 same shape as the original cnn_cache.
         """
-        return self.encoder.forward_chunk(
+        return self.encoder.forward_chunk(xs, offset, required_cache_size,
-            xs, offset, required_cache_size, att_cache, cnn_cache)
+                                          att_cache, cnn_cache)
 
     # @jit.to_static
     def ctc_activation(self, xs: paddle.Tensor) -> paddle.Tensor:

paddlespeech/s2t/modules/encoder_layer.py

@@ -105,9 +105,7 @@ class TransformerEncoderLayer(nn.Layer):
         if self.normalize_before:
             x = self.norm1(x)
 
-        x_att, new_att_cache = self.self_attn(
+        x_att, new_att_cache = self.self_attn(x, x, x, mask, cache=att_cache)
-            x, x, x, mask, cache=att_cache
-        )
 
         if self.concat_after:
             x_concat = paddle.concat((x, x_att), axis=-1)
@@ -211,7 +209,8 @@ class ConformerEncoderLayer(nn.Layer):
             att_cache (paddle.Tensor): Cache tensor of the KEY & VALUE
                 (#batch=1, head, cache_t1, d_k * 2), head * d_k == size.
             cnn_cache (paddle.Tensor): Convolution cache in conformer layer
-                (#batch=1, size, cache_t2)
+                (1, #batch=1, size, cache_t2). First dim will not be used, just
+                for dy2st.
         Returns:
            paddle.Tensor: Output tensor (#batch, time, size).
            paddle.Tensor: Mask tensor (#batch, time, time).
@@ -219,6 +218,8 @@ class ConformerEncoderLayer(nn.Layer):
                 (#batch=1, head, cache_t1 + time, d_k * 2).
            paddle.Tensor: cnn_cahce tensor (#batch, size, cache_t2).
         """
+        # (1, #batch=1, size, cache_t2) -> (#batch=1, size, cache_t2)
+        cnn_cache = paddle.squeeze(cnn_cache, axis=0)
 
         # whether to use macaron style FFN
         if self.feed_forward_macaron is not None:
@@ -250,7 +251,6 @@ class ConformerEncoderLayer(nn.Layer):
         # convolution module
         # Fake new cnn cache here, and then change it in conv_module
         new_cnn_cache = paddle.zeros([0, 0, 0], dtype=x.dtype)
-        cnn_cache = paddle.squeeze(cnn_cache, axis=0)
         if self.conv_module is not None:
             residual = x
             if self.normalize_before: