Install Ocaml-Torch failed on macos with M1 chip

[Murphy-OrangeMud]

Install Ocaml-Torch failed on macos with M1 chip

[vthemelis]

@Murphy-OrangeMud , did you manage to resolve this issue? I'm having a similar issue at the moment.

EDIT: I found the issue: I was pulling a very old version of torch because my OCaml version was old.

[vthemelis]

There are a few issues with installing this on an M1 Mac but here are the steps:

• Download libtorch binaries (or build libtorch in your Mac). At the moment there are no official pre-build binaries. I downloaded my (unofficial) binaries from https://github.com/mlverse/libtorch-mac-m1/releases .
• Double check what libtorch version is compatible with the current version of torch. Version 1.13.1 is the one you want with v0.16.0 version of torch.
• Set the LIBTORCH environment variable to the directory that includes the include and lib directories.
• Use the latest JaneStreet fork of this. Have a look at https://opam.ocaml.org/packages/torch/ for the current version.
• • This may require a newer OCaml version so check for that.
• • To install with opam:

opam install torch.v0.16.0 --ignore-constraints-on libtorch

Note that I had to ignore-constraints to avoid failing because libtorch is disabled for M1 Mac. Note also that I explicitly had to set the version of the package (JaneStreet version starts with v0 rather than 0) as I otherwise resolve to version 0.10 which is way too old.