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Update libtorch to 2.9 #1636

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Merged
merged 5 commits into from
Oct 18, 2025
Merged

Update libtorch to 2.9 #1636

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03bb18c
Update libtorch to 2.9
stewartj3 Oct 18, 2025
6279bb0
Replace README supported CUDA versions with table
stewartj3 Oct 18, 2025
e4a1bf6
Update parsing for libtorch versions to select correct cuda versions
stewartj3 Oct 18, 2025
192f14a
Add CUDA to the version numbers on the tables
stewartj3 Oct 18, 2025
18fa6de
Apply suggestion from @polvalente
polvalente Oct 18, 2025
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10 changes: 5 additions & 5 deletions torchx/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -38,11 +38,11 @@ to `2.4.0` or later.
If you want torch with CUDA support, please use `LIBTORCH_TARGET` to choose
CUDA versions. The current supported targets are:

- `cpu` default CPU only version
- `cu118` CUDA 11.8 and CPU version (no macOS support, libtorch `< 2.8.0` only)
- `cu126` CUDA 12.6 and CPU version (no macOS support)
- `cu128` CUDA 12.8 and CPU version (no macOS support)
- `cu129` CUDA 12.9 and CPU version (no macOS support, libtorch `>= 2.8.0` only)
| Torch Version | Supported Targets |
| --------------- | -------------------------------------------------------------- |
| 2.7.0 | cpu, cu118 (CUDA 11.8), cu126 (CUDA 12.6), cu128 (CUDA 12.8) |
| 2.8.0 | cpu, cu126 (CUDA 12.6), cu128 (CUDA 12.8), cu129 (CUDA 12.9) |
| 2.9.0 | cpu, cu126 (CUDA 12.6), cu128 (CUDA 12.8), cu130 (CUDA 13.0) |

Once downloaded, we will compile `Torchx` bindings. You will need `make`/`nmake`,
`cmake` (3.12+) and a `C++` compiler. If building on Windows, you will need:
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23 changes: 10 additions & 13 deletions torchx/mix.exs
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Expand Up @@ -74,22 +74,19 @@ defmodule Torchx.MixProject do
end

defp libtorch_config() do
target = System.get_env("LIBTORCH_TARGET", "cpu")
version = System.get_env("LIBTORCH_VERSION", "2.8.0")
env_dir = System.get_env("LIBTORCH_DIR")

# 2.8.0 is the first version that supports cu129 and drops cu118
# cu118 might still be needed for older hardware, so we're keeping it
# for now.
valid_targets = ["cpu", "cu118", "cu126", "cu128"]

# Supported targets for each LibTorch version:
valid_targets =
case Version.parse(version) do
{:ok, parsed} ->
if Version.match?(parsed, "<= 2.7.0") do
valid_targets
else
(valid_targets -- ["cu118"]) ++ ["cu129"]
cond do
Version.match?(parsed, "< 2.8.0") ->
["cpu", "cu118", "cu126", "cu128"]

Version.match?(parsed, "< 2.9.0") ->
["cpu", "cu126", "cu129"]

true ->
["cpu", "cu126", "cu128", "cu130"]
end

_ ->
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