We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
ncon_interface tests fail 


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `conftest.py`
Content:
```
1 # Copyright 2019 The TensorNetwork Authors
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #      http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 from __future__ import absolute_import
16 from __future__ import division
17 from __future__ import print_function
18 import pytest
19 
20 
21 @pytest.fixture(name="backend", params=["numpy", "tensorflow",
22                                         "jax", "pytorch"])
23 def backend_fixure(request):
24   return request.param
25
```

Path: `tensornetwork/__init__.py`
Content:
```
1 from __future__ import absolute_import
2 from tensornetwork.network import TensorNetwork
3 from tensornetwork.network_components import Node, Edge, CopyNode
4 from tensornetwork.ncon_interface import ncon, ncon_network
5 from tensornetwork.version import __version__
6 from tensornetwork.visualization.graphviz import to_graphviz
7 from tensornetwork import contractors
8 from tensornetwork import config
9 from typing import Text, Optional, Type
10 from tensornetwork.utils import load
11 
12 
13 def set_default_backend(backend: Text, dtype: Optional[Type] = None) -> None:
14   config.default_backend = backend
15   config.default_dype = dtype
16
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/conftest.py b/conftest.py
--- a/conftest.py
+++ b/conftest.py
@@ -16,9 +16,33 @@
 from __future__ import division
 from __future__ import print_function
 import pytest
+import jax
+import tensornetwork
+import tensorflow as tf
 
 
 @pytest.fixture(name="backend", params=["numpy", "tensorflow",
                                         "jax", "pytorch"])
 def backend_fixure(request):
   return request.param
+
+
+@pytest.fixture(autouse=True)
+def reset_default_backend():
+  tensornetwork.set_default_backend("numpy")
+  yield
+  tensornetwork.set_default_backend("numpy")
+
+
+@pytest.fixture(autouse=True)
+def enable_jax_64():
+  jax.config.update("jax_enable_x64", True)
+  yield
+  jax.config.update("jax_enable_x64", True)
+
+
+@pytest.fixture(autouse=True)
+def tf_enable_v2_behaviour():
+  tf.compat.v1.enable_v2_behavior()
+  yield
+  tf.compat.v1.enable_v2_behavior()
diff --git a/tensornetwork/__init__.py b/tensornetwork/__init__.py
--- a/tensornetwork/__init__.py
+++ b/tensornetwork/__init__.py
@@ -12,4 +12,4 @@
 
 def set_default_backend(backend: Text, dtype: Optional[Type] = None) -> None:
   config.default_backend = backend
-  config.default_dype = dtype
+  config.default_dtype = dtype

{"golden_diff": "diff --git a/conftest.py b/conftest.py\n--- a/conftest.py\n+++ b/conftest.py\n@@ -16,9 +16,33 @@\n from __future__ import division\n from __future__ import print_function\n import pytest\n+import jax\n+import tensornetwork\n+import tensorflow as tf\n \n \n @pytest.fixture(name=\"backend\", params=[\"numpy\", \"tensorflow\",\n                                         \"jax\", \"pytorch\"])\n def backend_fixure(request):\n   return request.param\n+\n+\n+@pytest.fixture(autouse=True)\n+def reset_default_backend():\n+  tensornetwork.set_default_backend(\"numpy\")\n+  yield\n+  tensornetwork.set_default_backend(\"numpy\")\n+\n+\n+@pytest.fixture(autouse=True)\n+def enable_jax_64():\n+  jax.config.update(\"jax_enable_x64\", True)\n+  yield\n+  jax.config.update(\"jax_enable_x64\", True)\n+\n+\n+@pytest.fixture(autouse=True)\n+def tf_enable_v2_behaviour():\n+  tf.compat.v1.enable_v2_behavior()\n+  yield\n+  tf.compat.v1.enable_v2_behavior()\ndiff --git a/tensornetwork/__init__.py b/tensornetwork/__init__.py\n--- a/tensornetwork/__init__.py\n+++ b/tensornetwork/__init__.py\n@@ -12,4 +12,4 @@\n \n def set_default_backend(backend: Text, dtype: Optional[Type] = None) -> None:\n   config.default_backend = backend\n-  config.default_dype = dtype\n+  config.default_dtype = dtype\n", "issue": "ncon_interface tests fail \n\n", "before_files": [{"content": "# Copyright 2019 The TensorNetwork Authors\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#      http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nfrom __future__ import absolute_import\nfrom __future__ import division\nfrom __future__ import print_function\nimport pytest\n\n\n@pytest.fixture(name=\"backend\", params=[\"numpy\", \"tensorflow\",\n                                        \"jax\", \"pytorch\"])\ndef backend_fixure(request):\n  return request.param\n", "path": "conftest.py"}, {"content": "from __future__ import absolute_import\nfrom tensornetwork.network import TensorNetwork\nfrom tensornetwork.network_components import Node, Edge, CopyNode\nfrom tensornetwork.ncon_interface import ncon, ncon_network\nfrom tensornetwork.version import __version__\nfrom tensornetwork.visualization.graphviz import to_graphviz\nfrom tensornetwork import contractors\nfrom tensornetwork import config\nfrom typing import Text, Optional, Type\nfrom tensornetwork.utils import load\n\n\ndef set_default_backend(backend: Text, dtype: Optional[Type] = None) -> None:\n  config.default_backend = backend\n  config.default_dype = dtype\n", "path": "tensornetwork/__init__.py"}], "after_files": [{"content": "# Copyright 2019 The TensorNetwork Authors\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#      http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nfrom __future__ import absolute_import\nfrom __future__ import division\nfrom __future__ import print_function\nimport pytest\nimport jax\nimport tensornetwork\nimport tensorflow as tf\n\n\n@pytest.fixture(name=\"backend\", params=[\"numpy\", \"tensorflow\",\n                                        \"jax\", \"pytorch\"])\ndef backend_fixure(request):\n  return request.param\n\n\n@pytest.fixture(autouse=True)\ndef reset_default_backend():\n  tensornetwork.set_default_backend(\"numpy\")\n  yield\n  tensornetwork.set_default_backend(\"numpy\")\n\n\n@pytest.fixture(autouse=True)\ndef enable_jax_64():\n  jax.config.update(\"jax_enable_x64\", True)\n  yield\n  jax.config.update(\"jax_enable_x64\", True)\n\n\n@pytest.fixture(autouse=True)\ndef tf_enable_v2_behaviour():\n  tf.compat.v1.enable_v2_behavior()\n  yield\n  tf.compat.v1.enable_v2_behavior()\n", "path": "conftest.py"}, {"content": "from __future__ import absolute_import\nfrom tensornetwork.network import TensorNetwork\nfrom tensornetwork.network_components import Node, Edge, CopyNode\nfrom tensornetwork.ncon_interface import ncon, ncon_network\nfrom tensornetwork.version import __version__\nfrom tensornetwork.visualization.graphviz import to_graphviz\nfrom tensornetwork import contractors\nfrom tensornetwork import config\nfrom typing import Text, Optional, Type\nfrom tensornetwork.utils import load\n\n\ndef set_default_backend(backend: Text, dtype: Optional[Type] = None) -> None:\n  config.default_backend = backend\n  config.default_dtype = dtype\n", "path": "tensornetwork/__init__.py"}]}