samskalicky opened a new issue #19811:
URL: https://github.com/apache/incubator-mxnet/issues/19811
## Description
Extensions subgraph example is failing for the v2.0 alpha tag with the
following error message on Linux (CPU build):
```
-------------------------------
Testing myProp Gluon Hybridize partitioning with extra input
Traceback (most recent call last):
File "test_subgraph.py", line 105, in <module>
test("myProp")
File "test_subgraph.py", line 77, in test
sym_block2.optimize_for(mx.nd.ones((3,2)), mx.nd.ones((3,2)),
backend="addInputPass")
File "/home/ubuntu/incubator-mxnet/python/mxnet/gluon/block.py", line
1390, in optimize_for
self._build_cache(x, *args)
File "/home/ubuntu/incubator-mxnet/python/mxnet/gluon/block.py", line
1203, in _build_cache
out = out.optimize_for(self._backend, arg_dict, aux_dict, ctx,
input_shapes, **self._backend_opts)
TypeError: optimize_for() argument after ** must be a mapping, not NoneType
```
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