masahi commented on code in PR #15678:
URL: https://github.com/apache/tvm/pull/15678#discussion_r1319438923


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python/tvm/relax/transform/optimize_layout_transform.py:
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@@ -0,0 +1,147 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# pylint: disable=invalid-name, unused-argument
+"""Relax Optimize Layout Transform pass."""
+from typing import Union
+import tvm
+from tvm import IRModule, relax
+from tvm.ir.transform import module_pass
+from tvm.relax.analysis import remove_all_unused
+from tvm.relax.expr_functor import mutator, PyExprMutator
+
+
+@mutator
+class OptimizeLayoutTranformMutator(PyExprMutator):

Review Comment:
   Why do you need a module-based pass for this rewriting? I think our pattern 
rewriter works at the function level partly because that's where the actual 
rewriting happens.



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