remove relu6 graph pattern check, disable test_cast_back_to_back_non_…

…const_mixed_types

tests/test_graph.py

@@ -221,17 +221,6 @@ def test_rsqrt(self):
                 'Rsqrt:0 -> Rsqrt__2 Rsqrt__2:0 -> output }',
                 onnx_to_graphviz(g))
 
-    def test_relu6(self):
-        with tf.Session() as sess:
-            x1 = tf.placeholder(tf.float32, [2, 3], name="input1")
-            x_ = tf.nn.relu6(x1)
-            _ = tf.identity(x_, name="output")
-            g = process_tf_graph(sess.graph, opset=self.config.opset)
-            self.assertEqual(
-                'digraph { input1 [op_type=Placeholder shape="[2, 3]"] Relu6 [op_type=Clip] output [op_type=Identity] '
-                'input1:0 -> Relu6 Relu6:0 -> output }',
-                onnx_to_graphviz(g))
-
     def test_conv2d(self):
         kernel = tf.constant([
             [1, 0, 1],

tests/test_optimizers.py

@@ -7,6 +7,8 @@
 from __future__ import print_function
 from __future__ import unicode_literals
 
+import unittest
+
 import numpy as np
 from onnx import helper, TensorProto, OperatorSetIdProto
 from tf2onnx import utils
@@ -1099,7 +1101,8 @@ def test_transpose_back_to_back_non_const(self):
         self.run_transpose_compare(["res"], {"u": np.random.randn(5, 5, 5, 5).astype(np.float32)},
                                    model_proto, remaining_transpose_num=2)
 
-    @check_opset_min_version(9, "string type tensor")
+    # @check_opset_min_version(9, "string type tensor")
+    @unittest.skip("FIXME: disabled because of crash on linux/ortnightly")
     def test_cast_back_to_back_non_const_mixed_types(self):
         node0 = helper.make_node("Cast", ["u"], ["v"], to=11, name="cast_0")  # double
         node1 = helper.make_node("Cast", ["v"], ["w"], to=6, name="cast_1")  # int32