avoid hardcoding /scratch/

[152334H]

on slurm jobs, a /scratch/slurm_tmpdir/ folder is attempted to be used for the TMP_DIR env var.

this is strange, given that

• TMP_DIR is not used anywhere else in the repository, nor is it a common env var name
• /scratch/ does not exist in all slurm setups, and is an artefact of the author's personal cluster having their NFS at /scratch/ specifically

therefore I propose deleting the code

[BadrYoubiIdrissi]

Hi ! Thank you for your PR :) we've had some really annoying issues when leaving tmp to be the system default. Especially on clusters used by many people where /tmp fills up fast. Although the code doesn't directly use TMP_DIR, there are many packages beneath that do, most importantly multiprocessing and triton. A full tmp makes spawning processes extremely slow and painful and makes the whole code slower silently. How about making that environment variable configurable ?

[152334H]

Ah, I see. Forgive me then, I didn't realize the code was harmless when the folder was missing.

[152334H]

wait, where in multiprocessing/triton do you see the use of TMP_DIR? I am unable to find hits for it via Github Search.

[152334H]

if the intended target is TMPDIR/TMP, it may be worthwhile to add it to EnvironmentArgs, with the hardcoded default as a special case

[BadrYoubiIdrissi]

My bad ! Triton doesn't directly use it, we have this in our env setup also

lingua/lingua/distributed.py

Lines 212 to 220 in 60af836

	# When using Triton, it attempts to locate prebuilt kernels in a cache
	# located at ~/.triton/cache, but when that's backed by NFS this can fail
	# with a "OSError: [Errno 116] Stale file handle" error. If we were to set
	# it to a local directory it would belong to the first user who created it
	# and it would fail for the job of any other successive user assigned to
	# that machine. To avoid all this mess we use a temporary per-process cache.
	triton_cache_dir = tempfile.mkdtemp()
	atexit.register(shutil.rmtree, triton_cache_dir, ignore_errors=True)
	env_vars["TRITON_CACHE_DIR"] = triton_cache_dir

But we do that before setting temp_dir so triton is probably not affected by that ! Let me see how to make this better