Fix version check bug (apache#6784)

* Fix version check bug

* Update pytorch_utils.py

* Update pytorch_utils.py

* Update pytorch_utils.py

* Update pytorch_utils.py

python/tvm/relay/frontend/pytorch_utils.py

@@ -0,0 +1,27 @@
+# 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=import-outside-toplevel
+""" Common utilities used by PyTorch frontend """
+
+
+def is_version_greater_than(ver):
+    import torch
+    import re
+
+    return "".join(re.findall(r"(\d+\.)(\d+\.)(\d)", torch.__version__)[0]) > "".join(
+        re.findall(r"(\d+\.)(\d+\.)(\d)", ver)[0]
+    )