This PR Updates the NDArray => Tensor.
Both tensor and ndarray are commonly used terms.
Because the term Tensor is getting more common in the context of ML,
we do the rename to stay more aligned with torch.Tensor and DLTensor.
This PR renames the filenames/namespaces of `relax_vm`
to `vm`.
Previously, both VMs of relay and relax exist, and to avoid the
name conflicts, we added the prefix `relax_` to relax VM.
With the Relay runtime being phased out, we can now rename
`relax_vm` to `vm` for conciseness.
* [Docs] Introduce Relax API and move legacy part to standalone page
As the TVM project evolves, the Unity strategy has been the recommended
way to use Apache TVM applications. Hence, we are pushing documentation
for the Relax API to the forefront and moving the legacy part to a
standalone page, which may be removed in the future.
* update for ci
* update for ci
Tianqi Chen