Claude/fix todo mijlszxeg9tuuwzw 01 bzhjo ma hv wn ehc dkp3 vcsk

gemma/config.py

@@ -310,7 +310,7 @@ def get_config_for_27b_v3(dtype: str) -> GemmaConfig:
 
 
 def get_model_config(variant: str, dtype: str = 'bfloat16') -> GemmaConfig:
-  """Gets the GemmaConfig for the diresired variant and dtype."""
+  """Gets the GemmaConfig for the desired variant and dtype."""
   # Gemma1 variants
   if variant == '7b':
     return get_config_for_7b(dtype)
@@ -336,5 +336,5 @@ def get_model_config(variant: str, dtype: str = 'bfloat16') -> GemmaConfig:
   else:
     raise ValueError(
         f'Invalid variant {variant}. Supported variants are "1b", "2b", '
-        '"2b-v2", "4b",, "7b", "9b" "12b", "27b", and "27b_v3".'
+        '"2b-v2", "4b", "7b", "9b", "12b", "27b", and "27b_v3".'
     )

gemma/siglip_vision/config.py

@@ -21,7 +21,7 @@
 # https://developers.googleblog.com/en/gemma-explained-paligemma-architecture/
 @dataclasses.dataclass
 class SiglipVisionModelConfig:
-  """Returns the model config for the vision model of Gemma 3 andPaliGemma."""
+  """Returns the model config for the vision model of Gemma 3 and PaliGemma."""
   # The number of transformer encoder blocks in the siglip encoder model.
   num_hidden_layers: int = 27
   # The dimension of the embedding.

gemma/tokenizer.py

@@ -16,8 +16,10 @@
 
 import sentencepiece
 
-def _assert_file_exists(model_path: str):
-    assert os.path.isfile(model_path), model_path
+def _assert_file_exists(model_path: Optional[str]):
+    if model_path is None:
+        raise ValueError("model_path cannot be None")
+    assert os.path.isfile(model_path), f"Model file not found: {model_path}"
 
 _BEGIN_IMAGE_TOKEN = 255999
 _END_IMAGE_TOKEN = 256000

scripts/run.py

@@ -35,7 +35,7 @@
 flags.DEFINE_string('prompt', 'What are large language models?', 'Input prompt for the model.')
 
 # Define valid text only model variants
-_VALID_MODEL_VARIANTS = ['2b', '2b-v2', '7b', '9b', '27b', '1b']
+_VALID_MODEL_VARIANTS = ['1b', '2b', '2b-v2', '4b', '7b', '9b', '12b', '27b', '27b_v3']
 
 # Define valid devices
 _VALID_DEVICES = ['cpu', 'cuda']