[BUG] coalesce with Tensor dispatch to coalesce with Shape about cutlass

[ccecka]

Thanks, that's actually a pretty serious bug and affects all functions that have an overload for Tensor&& and a generic overload (typically for IntTuple const&). These appear to include
flatten
coalesce
filter_zeros
take

Previously, this has been solved by renaming functions -- see group_modes vs group and filter versus filter_tuple. Rather than that, we should probably just do the rref three-step dance for those functions

template <class Engine, class Layout>
CUTE_HOST_DEVICE constexpr auto
flatten(Tensor<Engine,Layout> const& tensor) {
  return make_tensor(tensor.data(), flatten(tensor.layout()));
}

template <class Engine, class Layout>
CUTE_HOST_DEVICE constexpr auto
flatten(Tensor<Engine,Layout>& tensor) {
  return make_tensor(tensor.data(), flatten(tensor.layout()));
}

template <class Engine, class Layout>
CUTE_HOST_DEVICE constexpr auto
flatten(Tensor<Engine,Layout>&& tensor) {
  return make_tensor(tensor.data(), flatten(tensor.layout()));
}

I'll make sure this gets fixed as soon as possible.

[cloudhan]

@thakkarV @ccecka Pls take a look.

[ccecka]

There's no pointer or tensor type.

Tensor a = make_tensor<float>(make_shape(_4{}, _1{}));          // Owning tensor
Tensor b = make_tensor(my_float_ptr, make_shape(_4{}, _1{}));   // Non-owning tensor

Your version should not compile, but could have a better error message.

[cloudhan]

@ccecka I updated the issue code sample. The problem is coalesce(tensor) will dispatch to coalesce(Shape s) when tensor is defined out side of function bad

a.k.a, the error message

"auto cute::coalesce(const Shape &) [with Shape=cute::Tensor<cute::ArrayEngine<...

[thakkarV]

fixed with #1623