[QST] DLPack: kDLCUDAManaged is never used

[lennartvoelz]

Context

When studying the DLPack header I realized that there is an explicit kDLCUDAManaged device type (see include/matx/core/dlpack.h:104) that is not emitted in the MatX repo. MatX still uses this fallback (tensor.h:1509):

// We have a record of this pointer and can map it from the record
switch (kind) {
    case MATX_MANAGED_MEMORY:
    case MATX_DEVICE_MEMORY:
    case MATX_ASYNC_DEVICE_MEMORY:
        t->device.device_type = kDLCUDA;
        t->device.device_id = dev_ord;
        break;

This is not 'wrong' but I wondered if there is any particular reason for doing so, or if it is simply a stale artifact that should be 'fixed'.
If this is intended, it might be helpful to add a short comment.

[cliffburdick]

Hi @lennartvoelz, it's likely that type was added later than the version of dlpack we started with. We should fix this.