zhiics commented on a change in pull request #5052:
URL: https://github.com/apache/incubator-tvm/pull/5052#discussion_r439506457



##########
File path: tests/python/contrib/test_onnx_model.py
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@@ -0,0 +1,167 @@
+# 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.
+
+"""Relay to ONNX serialization test cases"""
+import pytest
+pytest.importorskip('onnx')
+pytest.importorskip('onnxruntime')
+
+from collections import OrderedDict
+import numpy as np
+import onnxruntime as rt
+import tvm
+from tvm import relay
+from tvm.contrib.target.onnx import to_onnx
+import tvm.relay.testing
+from tvm.relay.op.annotation import compiler_begin, compiler_end
+from tvm.ir import IRModule
+from tvm.relay import transform
+
+
+def func_to_onnx(mod, params, name):
+    onnx_model = to_onnx(mod, params, name, path=None)
+    return onnx_model.SerializeToString()
+
+
+def run_onnx(mod, params, name, input_data):
+    onnx_model = func_to_onnx(mod, params, name)
+    sess = rt.InferenceSession(onnx_model)
+    input_names = {}
+    for input, data in zip(sess.get_inputs(), input_data):
+        input_names[input.name] = data
+    output_names = [output.name for output in sess.get_outputs()]
+    res = sess.run(output_names, input_names)
+    return res[0]
+
+
+def get_data(in_data_shapes, dtype='float32'):
+    in_data = OrderedDict()
+    for name, shape in in_data_shapes.items():
+        in_data[name] = np.random.uniform(size=shape).astype(dtype)
+    return in_data
+
+
+def run_relay(mod, params, in_data):
+    target = 'llvm'
+    ctx = tvm.context('llvm', 0)
+    intrp = relay.create_executor("graph", mod, ctx=ctx, target=target)
+    in_data = [tvm.nd.array(value) for value in in_data.values()]
+    return intrp.evaluate()(*in_data, **params).asnumpy()
+
+
+def _verify_results(mod, params, in_data):
+    a = run_relay(mod, params, in_data)
+    b = run_onnx(mod, params, 'test_resent', in_data.values())
+    np.testing.assert_allclose(a, b, rtol=1e-7, atol=1e-7)
+
+
+def test_resnet():
+    num_class = 1000
+    in_data_shapes = OrderedDict({"data": (1, 3, 224, 224)})
+    in_data = get_data(in_data_shapes, dtype="float32")
+    for n in [18, 34, 50, 101]:
+        mod, params = tvm.relay.testing.resnet.get_workload(
+            1, num_class, num_layers=n)
+        _verify_results(mod, params, in_data)
+
+
+def test_squeezenet():
+    in_data_shapes = OrderedDict({"data": (1, 3, 224, 224)})
+    in_data = get_data(in_data_shapes, dtype="float32")
+    for version in ['1.0', '1.1']:
+        mod, params = tvm.relay.testing.squeezenet.get_workload(1, 
version=version)
+        _verify_results(mod, params, in_data)
+
+
+def skipped_test_partition():
+    in_1 = relay.var('in_1', shape=(10, 10), dtype='float32')
+    in_2 = relay.var('in_2', shape=(10, 10), dtype='float32')
+    in_3 = relay.var('in_3', shape=(10, 10), dtype='float32')
+    in_4 = relay.var('in_4', shape=(10, 10), dtype='float32')
+    in_5 = relay.var('in_5', shape=(10, 10), dtype='float32')
+    in_6 = relay.var('in_6', shape=(10, 10), dtype='float32')
+    in_7 = relay.var('in_7', shape=(10, 10), dtype='float32')
+    in_8 = relay.var('in_8', shape=(10, 10), dtype='float32')
+    in_9 = relay.var('in_9', shape=(10, 10), dtype='float32')
+    in_10 = relay.var('in_10', shape=(10, 10), dtype='float32')
+
+    begin0 = compiler_begin(in_1, "onnx")
+    begin1 = compiler_begin(in_2, "onnx")
+    begin2 = compiler_begin(in_3, "onnx")
+    begin3 = compiler_begin(in_4, "onnx")
+    node0 = relay.add(begin0, begin1)
+    node1 = relay.add(begin2, begin3)
+    end0 = compiler_end(node0, "onnx")
+    end1 = compiler_end(node1, "onnx")
+    begin4 = compiler_begin(end0, "onnx")
+    begin5 = compiler_begin(end1, "onnx")
+    node2 = relay.add(begin4, begin5)
+    end2 = compiler_end(node2, "onnx")
+
+    dbegin0 = compiler_begin(in_5, "default")
+    dbegin1 = compiler_begin(in_6, "default")
+    node3 = relay.subtract(dbegin0, dbegin1)
+    dbegin2 = compiler_begin(in_7, "default")
+    dend1 = compiler_end(node3, "default")
+    dbegin3 = compiler_begin(dend1, "default")
+    node4 = relay.subtract(dbegin2, dbegin3)
+    dend2 = compiler_end(node4, "default")
+
+    begin6 = compiler_begin(end2, "onnx")
+    begin7 = compiler_begin(dend2, "onnx")
+    node5 = relay.add(begin6, begin7)
+    end3 = compiler_end(node5, "onnx")
+    end4 = compiler_end(node5, "onnx")
+    dbegin4 = compiler_begin(in_8, "default")
+    dbegin5 = compiler_begin(end3, "default")
+    node6 = relay.subtract(dbegin4, dbegin5)
+    begin8 = compiler_begin(in_9, "onnx")
+    begin9 = compiler_begin(end4, "onnx")
+    node7 = relay.multiply(begin8, begin9)
+    end5 = compiler_end(node7, "onnx")
+
+    dend3 = compiler_end(node6, "default")
+    begin10 = compiler_begin(dend3, "onnx")
+    begin11 = compiler_begin(end5, "onnx")
+    node8 = relay.add(begin10, begin11)
+    end6 = compiler_end(node8, "onnx")
+    begin12 = compiler_begin(in_10, "onnx")
+    begin13 = compiler_begin(end6, "onnx")
+    node9 = relay.add(begin12, begin13)
+    end7 = compiler_end(node9, "onnx")
+
+    func = relay.Function([in_1, in_2, in_3, in_4, in_5, in_6, in_7, in_8, 
in_9, in_10], end7)
+
+    target = 'llvm'
+    mod = IRModule()
+    expr = func
+    mod["main"] = expr

Review comment:
       you can just do `mod = IRModule.from_expr(func)`




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