s2t: fix encoder.py

paddlespeech/s2t/modules/encoder.py

@@ -255,6 +255,7 @@ class BaseEncoder(nn.Layer):
                 xs,
                 att_mask,
                 pos_emb,
+                mask_pad=paddle.ones([0, 0, 0], dtype=paddle.bool),
                 att_cache=att_cache[i:i + 1] if elayers > 0 else att_cache,
                 cnn_cache=cnn_cache[i:i + 1]
                 if paddle.shape(cnn_cache)[0] > 0 else cnn_cache, )