Adds code to turn onnx example into python unit test (#375)

* Adds code to turn onnx example into python unit test

* Update test_onnx_backend.py

_unittests/ut_testing/test_onnx_backend.py

@@ -1,7 +1,11 @@
 """
-@brief      test log(time=10s)
+@brief      test log(time=40s)
 """
 import unittest
+from numpy import array, float32
+from onnx.helper import (
+    make_model, make_node, set_model_props, make_graph,
+    make_tensor_value_info)
 from pyquickhelper.pycode import ExtTestCase
 from mlprodict.testing.onnx_backend import enumerate_onnx_tests
 from mlprodict.onnxrt import OnnxInference
@@ -61,11 +65,127 @@ def test_enumerate_onnx_tests_run(self):
         if __name__ == '__main__':
             print(len(missed), len(failed), len(mismatch))
             for t in failed:
-                print("failed", t[0])
+                print("failed", str(t[0]).replace('\\\\', '\\'))
             for t in mismatch:
-                print("mismatch", t[0])
+                print("mismatch", str(t[0]).replace('\\\\', '\\'))
             for t in missed:
-                print("missed", t[0])
+                print("missed", str(t[0]).replace('\\\\', '\\'))
+
+    def test_onnx_backend_test_to_python(self):
+        name = 'test_abs'
+        code = []
+        for te in enumerate_onnx_tests('node', lambda folder: folder == name):
+            code.append(te.to_python())
+        self.assertEqual(len(code), 1)
+        self.assertIn('def test_abs(self):', code[0])
+        self.assertIn('from onnx.helper', code[0])
+        self.assertIn('for y, gy in zip(ys, goty):', code[0])
+        if __name__ == '__main__':
+            print(code[0])
+
+    def test_abs(self):
+
+        def create_model():
+            '''
+            Converted ``test_abs``.
+
+            * producer: backend-test
+            * version: 0
+            * description:
+            '''
+
+            initializers = []
+            nodes = []
+            inputs = []
+            outputs = []
+
+            opsets = {'': 9}
+
+            value = make_tensor_value_info('x', 1, [3, 4, 5])
+            inputs.append(value)
+
+            value = make_tensor_value_info('y', 1, [3, 4, 5])
+            outputs.append(value)
+
+            node = make_node(
+                'Abs',
+                ['x'],
+                ['y'],
+                domain='')
+            nodes.append(node)
+
+            graph = make_graph(nodes, 'test_abs', inputs, outputs, initializers)
+
+            onnx_model = make_model(graph)
+            onnx_model.ir_version = 3
+            onnx_model.producer_name = 'backend-test'
+            onnx_model.producer_version = ''
+            onnx_model.domain = ''
+            onnx_model.model_version = 0
+            onnx_model.doc_string = ''
+            set_model_props(onnx_model, {})
+
+            del onnx_model.opset_import[:]  # pylint: disable=E1101
+            for dom, value in opsets.items():
+                op_set = onnx_model.opset_import.add()
+                op_set.domain = dom
+                op_set.version = value
+
+            return onnx_model
+
+        onnx_model = create_model()
+
+        oinf = OnnxInference(onnx_model)
+        xs = [
+            array([[[1.7640524, 0.4001572, 0.978738, 2.2408931,
+                     1.867558],
+                    [-0.9772779, 0.95008844, -0.1513572, -0.10321885,
+                     0.41059852],
+                    [0.14404356, 1.4542735, 0.7610377, 0.12167501,
+                     0.44386324],
+                    [0.33367434, 1.4940791, -0.20515826, 0.3130677,
+                     -0.85409576]],
+
+                   [[-2.5529897, 0.6536186, 0.8644362, -0.742165,
+                     2.2697546],
+                    [-1.4543657, 0.04575852, -0.18718386, 1.5327792,
+                     1.4693588],
+                    [0.15494743, 0.37816253, -0.88778573, -1.9807965,
+                     -0.34791216],
+                    [0.15634897, 1.2302907, 1.2023798, -0.3873268,
+                     -0.30230275]],
+
+                   [[-1.048553, -1.420018, -1.7062702, 1.9507754,
+                     -0.5096522],
+                    [-0.4380743, -1.2527953, 0.7774904, -1.6138978,
+                     -0.21274029],
+                    [-0.89546657, 0.3869025, -0.51080513, -1.1806322,
+                     -0.02818223],
+                    [0.42833188, 0.06651722, 0.3024719, -0.6343221,
+                     -0.36274117]]], dtype=float32),
+        ]
+        ys = [
+            array([[[1.7640524, 0.4001572, 0.978738, 2.2408931, 1.867558],
+                    [0.9772779, 0.95008844, 0.1513572, 0.10321885, 0.41059852],
+                    [0.14404356, 1.4542735, 0.7610377, 0.12167501, 0.44386324],
+                    [0.33367434, 1.4940791, 0.20515826, 0.3130677, 0.85409576]],
+
+                   [[2.5529897, 0.6536186, 0.8644362, 0.742165, 2.2697546],
+                    [1.4543657, 0.04575852, 0.18718386, 1.5327792, 1.4693588],
+                    [0.15494743, 0.37816253, 0.88778573, 1.9807965, 0.34791216],
+                    [0.15634897, 1.2302907, 1.2023798, 0.3873268, 0.30230275]],
+
+                   [[1.048553, 1.420018, 1.7062702, 1.9507754, 0.5096522],
+                    [0.4380743, 1.2527953, 0.7774904, 1.6138978, 0.21274029],
+                    [0.89546657, 0.3869025, 0.51080513, 1.1806322, 0.02818223],
+                    [0.42833188, 0.06651722, 0.3024719, 0.6343221, 0.36274117]]],
+                  dtype=float32),
+        ]
+        feeds = {n: x for n, x in zip(oinf.input_names, xs)}
+        got = oinf.run(feeds)
+        goty = [got[k] for k in oinf.output_names]
+        for y, gy in zip(ys, goty):
+            self.assertEqualArray(y, gy)
 
 
 if __name__ == "__main__":

mlprodict/testing/onnx_backend.py

@@ -3,6 +3,7 @@
 @brief Tests with onnx backend.
 """
 import os
+import textwrap
 from numpy.testing import assert_almost_equal
 import onnx
 from onnx.numpy_helper import to_array
@@ -126,6 +127,47 @@ def run(self, load_fct, run_fct, index=None, decimal=5):
                     "Output %d of test %d in folder %r failed." % (
                         i, index, self.folder)) from ex
 
+    def to_python(self):
+        """
+        Returns a python code equivalent to the ONNX test.
+
+        :return: code
+        """
+        from ..onnx_tools.onnx_export import export2onnx
+        rows = []
+        code = export2onnx(self.onnx_model)
+        lines = code.split('\n')
+        lines = [line for line in lines
+                 if not line.strip().startswith('print') and
+                 not line.strip().startswith('# ')]
+        rows.append(textwrap.dedent("\n".join(lines)))
+        rows.append("oinf = OnnxInference(onnx_model)")
+        for test in self.tests:
+            rows.append("xs = [")
+            for inp in test['inputs']:
+                rows.append(textwrap.indent(repr(inp) + ',',
+                                            '    ' * 2))
+            rows.append("]")
+            rows.append("ys = [")
+            for out in test['outputs']:
+                rows.append(textwrap.indent(repr(out) + ',',
+                                            '    ' * 2))
+            rows.append("]")
+            rows.append("feeds = {n: x for n, x in zip(oinf.input_names, xs)}")
+            rows.append("got = oinf.run(feeds)")
+            rows.append("goty = [got[k] for k in oinf.output_names]")
+            rows.append("for y, gy in zip(ys, goty):")
+            rows.append("    self.assertEqualArray(y, gy)")
+            rows.append("")
+        code = "\n".join(rows)
+        final = "\n".join(["def %s(self):" % self.name,
+                           textwrap.indent(code, '    ')])
+        try:
+            from pyquickhelper.pycode.code_helper import remove_extra_spaces_and_pep8
+        except ImportError:
+            return final
+        return remove_extra_spaces_and_pep8(final)
+
 
 def enumerate_onnx_tests(series, fct_filter=None):
     """