feat: added a friendlier error message when providing the wrong model…

… type

fs2/cli/synthesize.py

@@ -416,7 +416,16 @@ def synthesize(  # noqa: C901
 
     # Load checkpoints
     print(f"Loading checkpoint from {model_path}", file=sys.stderr)
-    model: FastSpeech2 = FastSpeech2.load_from_checkpoint(model_path).to(device)  # type: ignore
+
+    from pydantic import ValidationError
+
+    try:
+        model: FastSpeech2 = FastSpeech2.load_from_checkpoint(model_path).to(device)  # type: ignore
+    except (TypeError, ValidationError) as e:
+        # TODO: should we print the following message only if there are more than X validation errors?
+        # e.error_count() > X
+        logger.error(f"Unable to load {model_path}: {e}")
+        sys.exit(1)
     model.eval()
 
     # get global step

fs2/model.py

@@ -43,7 +43,16 @@ def __init__(
         """ """
         super().__init__()
         if not isinstance(config, FastSpeech2Config):
-            config = FastSpeech2Config(**config)
+            from pydantic import ValidationError
+
+            try:
+                config = FastSpeech2Config(**config)
+            except ValidationError as e:
+                logger.error(f"{e}")
+                raise TypeError(
+                    "Unable to load config.  Possible causes: is it really a FastSpeech2Config? or the correct version?"
+                )
+
         if stats is not None and not isinstance(stats, Stats):
             stats = Stats(**stats)
         self.config = config