Num parameters in model.safetensors.index.json (#38531)

Num parameters in index.json

src/transformers/modeling_utils.py

@@ -3750,7 +3750,7 @@ class PreTrainedModel(nn.Module, ModuleUtilsMixin, PushToHubMixin, PeftAdapterMi
         index = None
         if state_dict_split.is_sharded:
             index = {
-                "metadata": state_dict_split.metadata,
+                "metadata": {"total_parameters": self.num_parameters(), **state_dict_split.metadata},
                 "weight_map": state_dict_split.tensor_to_filename,
             }