fix(xtts): clearer error message when file given to checkpoint_dir

TTS/tts/models/xtts.py

@@ -2,6 +2,7 @@
 import os
 from dataclasses import dataclass
 from pathlib import Path
+from typing import Optional
 
 import librosa
 import torch
@@ -10,6 +11,7 @@
 from coqpit import Coqpit
 from trainer.io import load_fsspec
 
+from TTS.tts.configs.xtts_config import XttsConfig
 from TTS.tts.layers.xtts.gpt import GPT
 from TTS.tts.layers.xtts.hifigan_decoder import HifiDecoder
 from TTS.tts.layers.xtts.stream_generator import init_stream_support
@@ -719,14 +721,14 @@ def get_compatible_checkpoint_state_dict(self, model_path):
 
     def load_checkpoint(
         self,
-        config,
-        checkpoint_dir=None,
-        checkpoint_path=None,
-        vocab_path=None,
-        eval=True,
-        strict=True,
-        use_deepspeed=False,
-        speaker_file_path=None,
+        config: XttsConfig,
+        checkpoint_dir: Optional[str] = None,
+        checkpoint_path: Optional[str] = None,
+        vocab_path: Optional[str] = None,
+        eval: bool = True,
+        strict: bool = True,
+        use_deepspeed: bool = False,
+        speaker_file_path: Optional[str] = None,
     ):
         """
         Loads a checkpoint from disk and initializes the model's state and tokenizer.
@@ -742,7 +744,9 @@ def load_checkpoint(
         Returns:
             None
         """
-
+        if checkpoint_dir is not None and Path(checkpoint_dir).is_file():
+            msg = f"You passed a file to `checkpoint_dir=`. Use `checkpoint_path={checkpoint_dir}` instead."
+            raise ValueError(msg)
         model_path = checkpoint_path or os.path.join(checkpoint_dir, "model.pth")
         if vocab_path is None:
             if checkpoint_dir is not None and (Path(checkpoint_dir) / "vocab.json").is_file():