fix for non-str output from evaluator

lm_eval/evaluator.py

@@ -102,7 +102,7 @@ def simple_evaluate(
 
     # add info about the model and few shot config
     results["config"] = {
-        "model": model,
+        "model": (model if isinstance(model, str) else model.config._name_or_path),
         "model_args": model_args,
         "num_fewshot": num_fewshot,
         "batch_size": batch_size,