Fix extract_tts_spectrograms.py model init

TTS/bin/extract_tts_spectrograms.py

@@ -16,7 +16,6 @@ from TTS.tts.models import setup_model
 from TTS.tts.utils.speakers import get_speaker_manager
 from TTS.utils.audio import AudioProcessor
 from TTS.utils.generic_utils import count_parameters
-from TTS.utils.io import load_fsspec
 
 use_cuda = torch.cuda.is_available()
 
@@ -239,8 +238,7 @@ def main(args):  # pylint: disable=redefined-outer-name
     model = setup_model(c)
 
     # restore model
-    checkpoint = load_fsspec(args.checkpoint_path, map_location="cpu")
-    model.load_state_dict(checkpoint["model"])
+    model.load_checkpoint(c, args.checkpoint_path, eval=True)
 
     if use_cuda:
         model.cuda()