diff --git a/pytorch2keras/converter.py b/pytorch2keras/converter.py
index 3767099..6f27b63 100644
--- a/pytorch2keras/converter.py
+++ b/pytorch2keras/converter.py
@@ -5,7 +5,6 @@
 from onnx2keras import onnx_to_keras
 import torch
 import onnx
-from onnx import optimizer
 import io
 import logging
 
@@ -13,7 +12,7 @@
 def pytorch_to_keras(
     model, args, input_shapes=None,
     change_ordering=False, verbose=False, name_policy=None,
-    use_optimizer=False, do_constant_folding=False
+    do_constant_folding=False
 ):
     """
     By given PyTorch model convert layers with ONNX.
@@ -69,17 +68,5 @@ def pytorch_to_keras(
 
     stream.seek(0)
     onnx_model = onnx.load(stream)
-    if use_optimizer:
-        if use_optimizer is True:
-            optimizer2run = optimizer.get_available_passes()
-        else:
-            use_optimizer = set(use_optimizer)
-            optimizer2run = [x for x in optimizer.get_available_passes() if x in use_optimizer]
-        logger.info("Running optimizer:\n%s", "\n".join(optimizer2run))
-        onnx_model = optimizer.optimize(onnx_model, optimizer2run)
-
-    k_model = onnx_to_keras(onnx_model=onnx_model, input_names=input_names,
-                            input_shapes=input_shapes, name_policy=name_policy,
-                            verbose=verbose, change_ordering=change_ordering)
 
     return k_model