diff --git a/onnxslim/core/slim.py b/onnxslim/core/slim.py
index bc84f07..7789a87 100644
--- a/onnxslim/core/slim.py
+++ b/onnxslim/core/slim.py
@@ -1,8 +1,5 @@
-import logging
 import os
-import sys
 import tempfile
-from typing import Dict, List
 
 import numpy as np
 import onnx
@@ -12,13 +9,7 @@
 from onnxslim.core.optimizer import delete_node, optimize_model
 from onnxslim.core.symbolic_shape_infer import SymbolicShapeInference
 from onnxslim.onnx_graphsurgeon.ir.tensor import Constant
-from onnxslim.utils import (
-    dump_model_info_to_disk,
-    gen_onnxruntime_input_data,
-    logger,
-    onnxruntime_inference,
-    print_model_info_as_table,
-)
+from onnxslim.utils import logger, save
 
 DEBUG = bool(os.getenv("ONNXSLIM_DEBUG"))
 AUTO_MERGE = True if os.getenv("ONNXSLIM_AUTO_MERGE") is None else bool(int(os.getenv("ONNXSLIM_AUTO_MERGE")))
@@ -91,8 +82,8 @@ def shape_infer(model: onnx.ModelProto):
     try:
         logger.debug("try onnxruntime shape infer.")
         model = SymbolicShapeInference.infer_shapes(model, auto_merge=AUTO_MERGE)
-    except Exception:
-        logger.debug("onnxruntime shape infer failed, try onnx shape infer.")
+    except Exception as err:
+        logger.debug(f"onnxruntime shape infer failed, try onnx shape infer. {err}")
         if model.ByteSize() >= checker.MAXIMUM_PROTOBUF:
             tmp_dir = tempfile.TemporaryDirectory()
             tmp_path = os.path.join(tmp_dir.name, "tmp.onnx")
diff --git a/tests/test_onnx_nets.py b/tests/test_onnx_nets.py
index f733b72..c085ae7 100644
--- a/tests/test_onnx_nets.py
+++ b/tests/test_onnx_nets.py
@@ -1,6 +1,7 @@
 import os
 import subprocess
 import warnings
+import shutil
 
 import pytest
 import timm
@@ -27,10 +28,11 @@ def test_torchvision(self, request, model, shape=(1, 3, 224, 224)):
         """Test various TorchVision models with random input tensors of a specified shape."""
         model = model(pretrained=PRETRAINED)
         x = torch.rand(shape)
-        os.makedirs(f"tmp/{request.node.name}", exist_ok=True)
+        directory = "tmp/" + request.node.name
+        os.makedirs(directory, exist_ok=True)
 
-        filename = f"tmp/{request.node.name}/{request.node.name}.onnx"
-        slim_filename = f"tmp/{request.node.name}/{request.node.name}_slim.onnx"
+        filename = f"{directory}/{request.node.name}.onnx"
+        slim_filename = f"{directory}/{request.node.name}_slim.onnx"
 
         torch.onnx.export(model, x, filename)
 
@@ -41,7 +43,7 @@ def test_torchvision(self, request, model, shape=(1, 3, 224, 224)):
         print(output)
         assert result.returncode == 0
 
-        os.remove(filename)
+        shutil.rmtree(directory, ignore_errors=True)
 
 
 class TestTimmClass:
@@ -55,12 +57,12 @@ def test_timm(self, request, model_name):
         model = timm.create_model(model_name, pretrained=PRETRAINED)
         input_size = model.default_cfg.get("input_size")
         x = torch.randn((1,) + input_size)
-
+        directory = "tmp/" + request.node.name
         try:
-            os.makedirs(f"tmp/{request.node.name}", exist_ok=True)
+            os.makedirs(directory, exist_ok=True)
 
-            filename = f"tmp/{request.node.name}/{request.node.name}.onnx"
-            slim_filename = f"tmp/{request.node.name}/{request.node.name}_slim.onnx"
+            filename = f"{directory}/{request.node.name}.onnx"
+            slim_filename = f"{directory}/{request.node.name}_slim.onnx"
             torch.onnx.export(model, x, filename)
         except Exception as e:
             print(f"An unexpected error occurred: {str(e)}")
@@ -75,7 +77,7 @@ def test_timm(self, request, model_name):
         print(output)
         assert result.returncode == 0
 
-        os.remove(filename)
+        shutil.rmtree(directory, ignore_errors=True)
 
 
 if __name__ == "__main__":