As part of pull request #28790,
F is redefined globally in nn/modules/batchnorm.h

namespace F = torch::nn::functional;

F is then used once in batchnorm.h and again in instancenorm.h

not a bug, but a problem for anyone using F in some other way.
it's solvable, but I don't see this pattern anywhere else in libtorch,
was wondering if this use is an anomaly,
and if we could use

return torch::nn::functional::detail::batch_norm(
return torch::nn::functional::detail::instance_norm(

thanks

cc @yf225