f8860add83
The trainer-discovery sweep tripped on TRL 0.x (cell HF=4.57.6+TRL<1)
and TRL 1.x (cell HF=latest+TRL=latest) with:
AST FAIL trl.trainer.get_peft_config: no spec
AST FAIL trl.trainer.get_quantization_config: no spec
TRL re-exports those as utility FUNCTIONS in trl.trainer.__init__.
Their names end with `_config` so my `endswith("_config")` filter
swept them up alongside real `*_config.py` submodules; importlib.util.
find_spec then returns None because they are not files on disk and
the AST stage records `no spec` -> failure.
Add `_is_real_submodule(qual_name)` that tests `find_spec().origin`
non-None and apply it to both `_trainer_files()` and
`_config_files()`. Re-exported utility functions are silently
filtered out -- they are NOT modules and unsloth's auto-discovery in
rl.py:patch_trl_rl_trainers does not pretend they are.
Note: rl.py:1939-1943 has the same `endswith("_trainer")` filter
without a submodule check; it gets away with it today only because
TRL has no public `<x>_trainer`-suffixed function exports. If TRL
ever adds one, the same gap appears upstream.
Cell HF=default+TRL=default succeeded on the previous run because
its TRL pin (resolved via pyproject) happens to ship a different
public surface that does not include the `get_*_config` re-exports.
Verified locally on TRL 0.25.1: 16/16 raw `_config` names are real
submodules; 0 non-module exports filtered. Filter is a no-op on
versions without the trap and a corrective skip on versions with it.
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