sxjscience opened a new issue #18878:
URL: https://github.com/apache/incubator-mxnet/issues/18878
Minimal reproducible example:
```python
import mxnet as mx
from mxnet.gluon.nn import HybridBlock
mx.npx.set_np()
class Foo(HybridBlock):
def hybrid_forward(self, F, x):
return F.np.mean(x, keepdims=None)
foo = Foo()
foo.hybridize()
out = foo(mx.np.ones((10, 10)))
out.asnumpy()
```
Output:
```
MXNetError: MXNetError: Invalid Parameter format for keepdims expect boolean
but value='None', in operator _npi_mean(name="", __profiler_scope__="foo0:",
axis="None", keepdims="None")
```
The root cause is that we should revise
https://github.com/apache/incubator-mxnet/blob/dde635f8c7666e205816da8ca4e519d0d213523f/src/operator/numpy/np_broadcast_reduce_op.h#L43
to use `dmlc::optional<bool>`.
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