samskalicky opened a new issue #19647:
URL: https://github.com/apache/incubator-mxnet/issues/19647
## Description
An exception is not thrown when `optimize_for` is called for an unknown
backend. Instead, all that happens is a print message:
```
>>> import mxnet as mx
>>> sym, args, aux=mx.model.load_checkpoint('resnet-18',0)
[23:54:04] src/nnvm/legacy_json_util.cc:209: Loading symbol saved by
previous version v0.8.0. Attempting to upgrade...
[23:54:04] src/nnvm/legacy_json_util.cc:217: Symbol successfully upgraded!
>>> sym.optimize_for('test')
[23:54:15] src/c_api/c_api_symbolic.cc:1547: Error optimizing for backend
'test' cannot be found
<Symbol softmax>
```
Notice that `optimize_for` actually returns a copy of the input symbol.
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