support bitransformer decoder, test=asr

paddlespeech/server/engine/asr/online/python/asr_engine.py

@@ -613,7 +613,8 @@ class PaddleASRConnectionHanddler:
         encoder_out = self.encoder_out.repeat(beam_size, 1, 1)
         encoder_mask = paddle.ones(
             (beam_size, 1, encoder_out.shape[1]), dtype=paddle.bool)
-        decoder_out, _ = self.model.decoder(
+
+        decoder_out, _, _ = self.model.decoder(
             encoder_out, encoder_mask, hyps_pad,
             hyps_lens)  # (beam_size, max_hyps_len, vocab_size)
         # ctc score in ln domain