mbrookhart commented on a change in pull request #5231:
URL: https://github.com/apache/incubator-tvm/pull/5231#discussion_r414721399



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File path: python/tvm/relay/df_pattern/__init__.py
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@@ -0,0 +1,488 @@
+# 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.
+"""The Relay Pattern Language and tooling."""
+from tvm.relay import Expr
+from ...ir.base import Node
+from ...ir import make_node
+from ...runtime import Object
+from ... import _ffi as tvm_ffi
+from ..op import get
+from . import _ffi as ffi
+
+
+def register_df_node(type_key=None):
+    """Register a Relay node type.
+
+    Parameters
+    ----------
+    type_key : str or cls
+        The type key of the node.
+    """
+    if not isinstance(type_key, str):
+        return tvm_ffi.register_object(
+            "relay.df_pattern." + type_key.__name__)(type_key)
+    return tvm_ffi.register_object(type_key)

Review comment:
       @jroesch can you comment on this? This was one of your contributions to 
the python API.




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