pytorch imple.: fix batch 1 inference from last commit

Author: SWivid

src/f5_tts/model/backbones/dit.py

@@ -238,18 +238,21 @@ def get_input_embed(
         audio_mask: bool["b n"] | None = None,  # noqa: F722
     ):
         if self.text_uncond is None or self.text_cond is None or not cache:
-            batch = x.shape[0]
-            seq_lens = audio_mask.sum(dim=1)
-            text_embed_list = []
-            for i in range(batch):
-                text_embed_i = self.text_embed(
-                    text[i].unsqueeze(0),
-                    seq_lens[i].item(),
-                    drop_text=drop_text,
-                    audio_mask=audio_mask,
-                )
-                text_embed_list.append(text_embed_i[0])
-            text_embed = pad_sequence(text_embed_list, batch_first=True, padding_value=0)
+            if audio_mask is None:
+                text_embed = self.text_embed(text, x.shape[1], drop_text=drop_text, audio_mask=audio_mask)
+            else:
+                batch = x.shape[0]
+                seq_lens = audio_mask.sum(dim=1)
+                text_embed_list = []
+                for i in range(batch):
+                    text_embed_i = self.text_embed(
+                        text[i].unsqueeze(0),
+                        seq_lens[i].item(),
+                        drop_text=drop_text,
+                        audio_mask=audio_mask,
+                    )
+                    text_embed_list.append(text_embed_i[0])
+                text_embed = pad_sequence(text_embed_list, batch_first=True, padding_value=0)
             if cache:
                 if drop_text:
                     self.text_uncond = text_embed