loopyt 39b086d781 feat(h20): route tile_kernels calls through a compat layer, so the model runs without TileLang
The references were importable and numerically validated, but nothing pointed the model at them:
the forward pass still called the compiled kernels, which raise ModuleNotFoundError on a host
without TileLang. This adds the routing layer and swaps the call sites.

`deepinfer/tk_compat/` exposes the *compiled* signatures -- out-buffers, in-place conventions,
argument order -- because that is what the 25 call sites are written against, and adapts to the
reference's shape internally. Selection is `DEEPINFER_KERNELS=auto|cuda|ref`; `auto` follows
whether TileLang imports.

The adapters are not pass-throughs. Each difference was found by running both backends:

* `per_token_cast` takes `num_per_channels=n`, the reference takes `block_size=(1, n)`.
* `apply_rotary` takes a concatenated cos|sin cache and rotates in place returning None; the
  reference takes cos and sin separately and returns a new tensor. The adapter splits, calls, and
  copies back, because the call site relies on the in-place contract.
* `engram_gate` takes the pre-multiplied weight and `(eps, clamp_value)`; the reference needs the
  two weights separately and `(clamp_value, eps)`. Since a product cannot be un-multiplied,
  `fused_weight` returns the pair on the reference path and the gate unpacks it.
* `mhc_pre_big_fuse_fwd` has no single reference: its five steps are composed from the reference's
  own components.
* `mhc_reduce_partials_and_rmsnorm_fwd` likewise; rebuilt from the reference's formula.

`moe_topk_gate(force_random=...)` raises rather than silently ignoring the flag. The reference has
no equivalent, and dropping it would route tokens differently while looking healthy.

Verification, all on the real call signatures: 18 cases compared between `cuda` and `ref` modes,
`ALL_MATCH`, 12 bitwise identical including every quantised byte and every routing index; plus a
smoke run that executes all 23 APIs with TileLang blocked, `ALL_CALLS_OK`.

End to end still has not completed, and the reason is not this change: six GPUs on the host are
held by other containers (82 GiB of 139 each), so the 8-way EP run OOMs in allocate_userbuffer and
the surviving ranks wait at a barrier. Recorded in the doc along with the command to rerun it.
2026-10-22 18:10:14 +08:00
..
eplb initial commit 2026-10-20 12:09:42 +08:00
input_metadata initial commit 2026-10-20 12:09:42 +08:00
layers feat(h20): route tile_kernels calls through a compat layer, so the model runs without TileLang 2026-10-22 18:10:14 +08:00
models feat(h20): route tile_kernels calls through a compat layer, so the model runs without TileLang 2026-10-22 18:10:14 +08:00
parallel_utils feat(h20): route tile_kernels calls through a compat layer, so the model runs without TileLang 2026-10-22 18:10:14 +08:00
__init__.py initial commit 2026-10-20 12:09:42 +08:00
layer_utils.py initial commit 2026-10-20 12:09:42 +08:00
model_loader.py initial commit 2026-10-20 12:09:42 +08:00
model_metadata_utils.py initial commit 2026-10-20 12:09:42 +08:00
model_output.py initial commit 2026-10-20 12:09:42 +08:00
sampling_inputs.py initial commit 2026-10-20 12:09:42 +08:00
utils.py initial commit 2026-10-20 12:09:42 +08:00