[Hackathon 7th] 修复 vctk 中 `spk_emb` 维度问题 (#3916)

* [Fix] vctk spk_emb dim

* [Update] dim == 1

paddlespeech/t2s/models/fastspeech2/fastspeech2.py

@@ -841,6 +841,9 @@ class FastSpeech2(nn.Layer):
             spk_emb = self.spk_projection(F.normalize(spk_emb))
             hs = hs + spk_emb.unsqueeze(1)
         elif self.spk_embed_integration_type == "concat":
+            # one wave `spk_emb` under synthesize, the dim is `1`
+            if spk_emb.dim() == 1:
+                spk_emb = spk_emb.unsqueeze(0)
             # concat hidden states with spk embeds and then apply projection
             spk_emb = F.normalize(spk_emb).unsqueeze(1).expand(
                 shape=[-1, paddle.shape(hs)[1], -1])