593 lines
20 KiB
Python
593 lines
20 KiB
Python
"""Unit tests for the Gefen-X optimizer integration (``unsloth.optimizers.gefenx``).
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These tests exercise the config→constructor mapping and parameter routing WITHOUT
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requiring a GPU, the real ``gefen`` package, or a full ``import unsloth`` (which
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triggers GPU init). The helper module has no relative imports, so it is loaded by
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file path and handed a fake ``gefen`` module that records constructor arguments.
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"""
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import importlib.util
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import pathlib
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import sys
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import types
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from dataclasses import dataclass, field
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from typing import List, Optional
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import pytest
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# --- Load unsloth/optimizers/gefenx.py standalone (no unsloth package import) ---
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_MODULE_PATH = pathlib.Path(__file__).resolve().parents[2] / "unsloth" / "optimizers" / "gefenx.py"
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_spec = importlib.util.spec_from_file_location("_unsloth_gefenx_under_test", _MODULE_PATH)
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gefenx = importlib.util.module_from_spec(_spec)
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_spec.loader.exec_module(gefenx)
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# --- Minimal stand-ins so the tests need neither torch nor unsloth.trainer -------
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@dataclass
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class _GefenXConfig:
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fused: bool = True
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factored_v_2d: bool = True
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force_1d_period_one: bool = False
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force_2d_period_one: bool = False
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period_one_substrings: tuple = ()
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codebook_refresh_every: int = 0
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stochastic_round: bool = False
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capturable: bool = False
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betas: Optional[tuple] = None
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eps: Optional[float] = None
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extra_kwargs: dict = field(default_factory = dict)
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@dataclass
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class _GefenXMuonConfig:
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fused: bool = True
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adjust_lr_fn: str = "match_rms_adamw"
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backup_lr_scale: Optional[float] = 0.5
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backup_lr: Optional[float] = None
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muon_lr: Optional[float] = None
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muon_weight_decay: Optional[float] = None
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backup_weight_decay: Optional[float] = None
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backup_1d_period_one: bool = True
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backup_2d_period_one: bool = False
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momentum: float = 0.95
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nesterov: bool = True
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ns_steps: int = 5
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ns_schedule: str = "tuned3"
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sharded_mode: str = "exact"
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fp8_ns: bool = False
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stochastic_round: bool = False
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normuon: bool = True
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cautious: bool = False
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capturable: bool = False
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backup_substrings: Optional[List[str]] = None
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betas: Optional[tuple] = None
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eps: Optional[float] = None
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extra_kwargs: dict = field(default_factory = dict)
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class _FakeParam:
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"""Enough of an nn.Parameter for make_gefenx_param_groups / grouping."""
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def __init__(self, requires_grad = True):
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self.requires_grad = requires_grad
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class _FakeModel:
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def __init__(self, named):
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self._named = named
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def named_parameters(self):
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return list(self._named)
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@pytest.fixture
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def fake_gefen(monkeypatch):
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"""Install a fake ``gefen`` module that records what got constructed."""
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captured = {}
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class _FakeGefen:
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def __init__(self, params, **kwargs):
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captured["gefen"] = {"params": params, "kwargs": kwargs}
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# Mimic torch.optim.Optimizer.param_groups shape for downstream code.
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self.param_groups = params
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def _from_model(
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model,
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*,
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backup_substrings = None,
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**kwargs,
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):
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captured["muon"] = {
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"model": model,
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"backup_substrings": backup_substrings,
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"kwargs": kwargs,
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}
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return "MUON_OPTIMIZER"
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class _FakeHybrid:
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from_model = staticmethod(_from_model)
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module = types.ModuleType("gefen")
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module.Gefen = _FakeGefen
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module.GefenMuonHybrid = _FakeHybrid
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monkeypatch.setitem(sys.modules, "gefen", module)
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return captured
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# --------------------------------------------------------------------------- #
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# coerce_optim_arg
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# --------------------------------------------------------------------------- #
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@pytest.mark.parametrize(
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"raw,expected",
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[
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("true", True),
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("False", False),
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("none", None),
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("null", None),
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("5", 5),
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("6.0e-6", 6.0e-6),
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("match_rms_adamw", "match_rms_adamw"),
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(True, True), # non-strings pass through unchanged
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(0.5, 0.5),
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(None, None),
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],
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)
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def test_coerce_optim_arg(raw, expected):
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assert gefenx.coerce_optim_arg(raw) == expected
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# --------------------------------------------------------------------------- #
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# make_gefenx_param_groups
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# --------------------------------------------------------------------------- #
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def test_param_groups_single_group_without_embedding_lr():
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model = _FakeModel(
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[
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("model.layers.0.self_attn.q_proj.weight", _FakeParam()),
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("model.embed_tokens.modules_to_save.default.weight", _FakeParam()),
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("model.layers.0.frozen.weight", _FakeParam(requires_grad = False)),
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]
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)
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groups = gefenx.make_gefenx_param_groups(model, lr = 1e-4, weight_decay = 0.01)
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# No embedding_lr => one group; frozen params excluded.
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assert len(groups) == 1
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assert len(groups[0]["params"]) == 2
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assert groups[0]["lr"] == 1e-4
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assert groups[0]["weight_decay"] == 0.01
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def test_param_groups_splits_embedding_lr():
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model = _FakeModel(
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[
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("model.layers.0.self_attn.q_proj.weight", _FakeParam()),
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("model.embed_tokens.modules_to_save.default.weight", _FakeParam()),
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]
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)
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groups = gefenx.make_gefenx_param_groups(model, lr = 1e-4, weight_decay = 0.0, embedding_lr = 5e-6)
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assert len(groups) == 2
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non_embed, embed = groups
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assert non_embed["lr"] == 1e-4 and len(non_embed["params"]) == 1
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assert embed["lr"] == 5e-6 and len(embed["params"]) == 1
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# --------------------------------------------------------------------------- #
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# build_gefenx_optimizer
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# --------------------------------------------------------------------------- #
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def test_build_gefenx_forwards_config_and_falls_back_to_trainer_betas(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXConfig(fused = True, factored_v_2d = False, stochastic_round = True)
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opt = gefenx.build_gefenx_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.01,
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betas = (0.9, 0.95),
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eps = 1e-8,
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)
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kw = fake_gefen["gefen"]["kwargs"]
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assert kw["fused"] is True
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assert kw["factored_v_2d"] is False
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assert kw["stochastic_round"] is True
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# betas/eps not set on the config => inherit the trainer's AdamW values.
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assert kw["betas"] == (0.9, 0.95)
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assert kw["eps"] == 1e-8
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# Empty period_one_substrings is dropped, not forwarded as ().
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assert "period_one_substrings" not in kw
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assert opt.param_groups == fake_gefen["gefen"]["params"]
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def test_extra_kwargs_reserved_keys_are_dropped(fake_gefen):
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# Reserved keys (would collide with the builders' explicit args -> TypeError)
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# are dropped from extra_kwargs with a warning; non-reserved keys pass through.
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXConfig(
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extra_kwargs = {"lr": 9.9, "weight_decay": 9.9, "codebook_refresh_every": "50"}
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)
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with pytest.warns(UserWarning, match = "reserved key"):
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gefenx.build_gefenx_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.01,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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kw = fake_gefen["gefen"]["kwargs"]
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# Build succeeds (no duplicate-keyword TypeError) and the reserved extra_kwargs
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# values did NOT override the real builder args (9.9 dropped, 1e-4 / 0.01 win).
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assert kw["lr"] == 1e-4
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assert kw["weight_decay"] == 0.01
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assert kw["codebook_refresh_every"] == 50 # allowed key -> coerced
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def test_muon_extra_kwargs_reserved_backup_substrings_dropped(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXMuonConfig(extra_kwargs = {"backup_substrings": ["x"], "ns_steps": "7"})
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with pytest.warns(UserWarning, match = "reserved key"):
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gefenx.build_gefenx_muon_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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kw = fake_gefen["muon"]["kwargs"]
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# backup_substrings is passed as an explicit arg, not via **kwargs.
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assert "backup_substrings" not in kw
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assert fake_gefen["muon"]["backup_substrings"] is None
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assert kw["ns_steps"] == 7
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def test_build_gefenx_config_betas_override_and_extra_kwargs(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXConfig(
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betas = (0.8, 0.9),
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eps = 1e-6,
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period_one_substrings = ("embed", "lm_head"),
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extra_kwargs = {"codebook_refresh_every": "100"}, # string coerced to int
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)
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gefenx.build_gefenx_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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kw = fake_gefen["gefen"]["kwargs"]
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assert kw["betas"] == (0.8, 0.9)
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assert kw["eps"] == 1e-6
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assert kw["period_one_substrings"] == ("embed", "lm_head")
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assert kw["codebook_refresh_every"] == 100
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# --------------------------------------------------------------------------- #
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# build_gefenx_muon_optimizer
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# --------------------------------------------------------------------------- #
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def test_build_gefenx_muon_applies_recommended_recipe(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXMuonConfig() # defaults encode the recipe
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opt = gefenx.build_gefenx_muon_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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assert opt == "MUON_OPTIMIZER"
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call = fake_gefen["muon"]
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assert call["model"] is model
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kw = call["kwargs"]
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assert kw["backup_1d_period_one"] is True
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assert kw["adjust_lr_fn"] == "match_rms_adamw"
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assert kw["fused"] is True
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# backup_lr defaults to backup_lr_scale (0.5) * lr.
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assert kw["backup_lr"] == pytest.approx(0.5 * 1e-4)
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assert kw["lr"] == 1e-4
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def test_build_gefenx_muon_explicit_backup_lr_wins(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXMuonConfig(backup_lr = 3e-5, backup_lr_scale = 0.5)
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gefenx.build_gefenx_muon_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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assert fake_gefen["muon"]["kwargs"]["backup_lr"] == 3e-5
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def test_build_gefenx_muon_backup_lr_scale_none_leaves_backup_lr_unset(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXMuonConfig(backup_lr_scale = None)
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gefenx.build_gefenx_muon_optimizer(
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model,
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config,
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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# No scale and no explicit backup_lr => gefen uses its own default (None).
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assert fake_gefen["muon"]["kwargs"].get("backup_lr") is None
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def test_build_gefenx_muon_passes_lr_weight_decay_and_backup_substrings(fake_gefen):
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model = _FakeModel([("w", _FakeParam())])
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config = _GefenXMuonConfig(backup_substrings = ["router", "gate"])
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gefenx.build_gefenx_muon_optimizer(
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model,
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config,
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lr = 2e-4,
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weight_decay = 0.05,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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call = fake_gefen["muon"]
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assert call["backup_substrings"] == ["router", "gate"]
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assert call["kwargs"]["lr"] == 2e-4
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assert call["kwargs"]["weight_decay"] == 0.05
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# --------------------------------------------------------------------------- #
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# Device gate: NVIDIA CUDA only (AMD/ROCm and Intel XPU rejected)
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# --------------------------------------------------------------------------- #
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def test_gate_rejects_rocm_hip_build(fake_gefen, monkeypatch):
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torch = pytest.importorskip("torch")
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# Simulate an AMD/ROCm PyTorch build by tagging torch.version.hip.
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monkeypatch.setattr(torch.version, "hip", "6.0.0", raising = False)
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model = _FakeModel([("w", _FakeParam())])
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with pytest.raises(RuntimeError, match = "ROCm|HIP|CUDA"):
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gefenx.build_gefenx_optimizer(
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model,
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_GefenXConfig(),
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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with pytest.raises(RuntimeError, match = "ROCm|HIP|CUDA"):
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gefenx.build_gefenx_muon_optimizer(
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model,
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_GefenXMuonConfig(),
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lr = 1e-4,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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# The gate fires before gefen is even imported/constructed.
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assert "gefen" not in fake_gefen and "muon" not in fake_gefen
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def test_gate_allows_non_hip(monkeypatch):
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torch = pytest.importorskip("torch")
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# A normal (non-HIP) build must pass the gate without raising.
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monkeypatch.setattr(torch.version, "hip", None, raising = False)
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gefenx._require_nvidia_cuda() # should not raise
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# --------------------------------------------------------------------------- #
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# End-to-end against the REAL gefen package + REAL Unsloth trainer path.
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#
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# These construct real gefen optimizers on a real torch model, take a real step,
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# and assert every trainable parameter actually moved (a no-op step would fail).
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# --------------------------------------------------------------------------- #
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def _cuda_available():
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try:
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import torch
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# NVIDIA CUDA only. On ROCm/HIP torch.cuda.is_available() is also True, but
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# the Gefen-X gate rejects HIP — so the fused tests must skip there too,
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# otherwise they'd error on _require_nvidia_cuda() instead of skipping.
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return torch.cuda.is_available() and getattr(torch.version, "hip", None) is None
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except Exception:
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return False
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_CUDA = _cuda_available()
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def _tiny_model(torch, device = "cpu"):
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# Embedding + 2D Linears + LayerNorm exercises all of gefen's routing buckets:
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# 2D hidden weights (Muon half), embedding/1D norm/bias (Gefen backup half).
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return torch.nn.Sequential(
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torch.nn.Embedding(16, 8),
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torch.nn.Linear(8, 8),
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torch.nn.LayerNorm(8),
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torch.nn.Linear(8, 8),
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).to(device)
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def _forward_backward(
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torch,
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model,
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device = "cpu",
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):
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ids = torch.arange(4, device = device)
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out = model[0](ids)
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out = model[1](out)
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out = model[2](out)
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out = model[3](out)
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out.sum().backward()
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def _num_changed(torch, before, model):
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return sum(1 for a, p in zip(before, model.parameters()) if not torch.equal(a, p))
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def test_real_gefenx_updates_all_params_cpu():
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torch = pytest.importorskip("torch")
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pytest.importorskip("gefen")
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from gefen import Gefen
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model = _tiny_model(torch)
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before = [p.detach().clone() for p in model.parameters()]
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opt = gefenx.build_gefenx_optimizer(
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model,
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_GefenXConfig(fused = False),
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lr = 1e-3,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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assert isinstance(opt, Gefen)
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_forward_backward(torch, model)
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opt.step()
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opt.zero_grad()
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assert _num_changed(torch, before, model) == len(before)
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def test_real_gefenx_muon_updates_all_params_cpu():
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torch = pytest.importorskip("torch")
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pytest.importorskip("gefen")
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from gefen import GefenMuonHybrid
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model = _tiny_model(torch)
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before = [p.detach().clone() for p in model.parameters()]
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opt = gefenx.build_gefenx_muon_optimizer(
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model,
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_GefenXMuonConfig(fused = False),
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lr = 1e-3,
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weight_decay = 0.0,
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betas = (0.9, 0.999),
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eps = 1e-8,
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)
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assert isinstance(opt, GefenMuonHybrid)
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_forward_backward(torch, model)
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opt.step()
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opt.zero_grad()
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assert _num_changed(torch, before, model) == len(before)
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@pytest.mark.skipif(not _CUDA, reason = "requires NVIDIA CUDA for the fused gefen kernels")
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def test_real_gefenx_cuda_fused_updates_all_params():
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import torch
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pytest.importorskip("gefen")
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|
model = _tiny_model(torch, "cuda")
|
|
before = [p.detach().clone() for p in model.parameters()]
|
|
opt = gefenx.build_gefenx_optimizer(
|
|
model,
|
|
_GefenXConfig(fused = True),
|
|
lr = 1e-3,
|
|
weight_decay = 0.0,
|
|
betas = (0.9, 0.999),
|
|
eps = 1e-8,
|
|
)
|
|
_forward_backward(torch, model, "cuda")
|
|
opt.step()
|
|
opt.zero_grad()
|
|
torch.cuda.synchronize()
|
|
assert _num_changed(torch, before, model) == len(before)
|
|
|
|
|
|
@pytest.mark.skipif(not _CUDA, reason = "requires NVIDIA CUDA for the fused gefen kernels")
|
|
def test_real_gefenx_muon_cuda_fused_updates_all_params():
|
|
import torch
|
|
|
|
pytest.importorskip("gefen")
|
|
|
|
model = _tiny_model(torch, "cuda")
|
|
before = [p.detach().clone() for p in model.parameters()]
|
|
opt = gefenx.build_gefenx_muon_optimizer(
|
|
model,
|
|
_GefenXMuonConfig(fused = True),
|
|
lr = 1e-3,
|
|
weight_decay = 0.0,
|
|
betas = (0.9, 0.999),
|
|
eps = 1e-8,
|
|
)
|
|
_forward_backward(torch, model, "cuda")
|
|
opt.step()
|
|
opt.zero_grad()
|
|
torch.cuda.synchronize()
|
|
assert _num_changed(torch, before, model) == len(before)
|
|
|
|
|
|
# --------------------------------------------------------------------------- #
|
|
# Full Unsloth trainer path: the REAL GefenXConfig / GefenXMuonConfig dataclasses
|
|
# carried through the REAL UnslothTrainingArguments and dispatched by the REAL
|
|
# UnslothTrainer.create_optimizer (not the standalone build_* helpers).
|
|
# --------------------------------------------------------------------------- #
|
|
def test_trainer_create_optimizer_dispatches_gefenx(tmp_path):
|
|
torch = pytest.importorskip("torch")
|
|
pytest.importorskip("gefen")
|
|
pytest.importorskip("unsloth")
|
|
from unsloth import GefenXConfig
|
|
from unsloth.trainer import UnslothTrainer, UnslothTrainingArguments
|
|
from gefen import Gefen
|
|
|
|
args = UnslothTrainingArguments(
|
|
output_dir = str(tmp_path / "gx"),
|
|
gefenx_config = GefenXConfig(fused = False),
|
|
learning_rate = 1e-3,
|
|
weight_decay = 0.0,
|
|
report_to = "none",
|
|
)
|
|
# Config plumbing on the real dataclass-typed argument.
|
|
assert args.gefenx_config is not None
|
|
assert args.gefenx_muon_config is None
|
|
|
|
trainer = UnslothTrainer.__new__(UnslothTrainer) # skip heavy SFTTrainer.__init__
|
|
trainer.model = _tiny_model(torch)
|
|
trainer.args = args
|
|
trainer.optimizer = None
|
|
|
|
before = [p.detach().clone() for p in trainer.model.parameters()]
|
|
opt = trainer.create_optimizer()
|
|
assert isinstance(opt, Gefen)
|
|
_forward_backward(torch, trainer.model)
|
|
opt.step()
|
|
opt.zero_grad()
|
|
assert _num_changed(torch, before, trainer.model) == len(before)
|
|
|
|
|
|
def test_trainer_create_optimizer_dispatches_gefenx_muon(tmp_path):
|
|
torch = pytest.importorskip("torch")
|
|
pytest.importorskip("gefen")
|
|
pytest.importorskip("unsloth")
|
|
from unsloth import GefenXMuonConfig
|
|
from unsloth.trainer import UnslothTrainer, UnslothTrainingArguments
|
|
from gefen import GefenMuonHybrid
|
|
|
|
args = UnslothTrainingArguments(
|
|
output_dir = str(tmp_path / "gm"),
|
|
gefenx_muon_config = GefenXMuonConfig(fused = False),
|
|
learning_rate = 1e-3,
|
|
weight_decay = 0.0,
|
|
report_to = "none",
|
|
)
|
|
assert args.gefenx_muon_config is not None
|
|
|
|
trainer = UnslothTrainer.__new__(UnslothTrainer)
|
|
trainer.model = _tiny_model(torch)
|
|
trainer.args = args
|
|
trainer.optimizer = None
|
|
|
|
before = [p.detach().clone() for p in trainer.model.parameters()]
|
|
opt = trainer.create_optimizer()
|
|
assert isinstance(opt, GefenMuonHybrid)
|
|
_forward_backward(torch, trainer.model)
|
|
opt.step()
|
|
opt.zero_grad()
|
|
assert _num_changed(torch, before, trainer.model) == len(before)
|
|
|
|
|
|
def test_conflicting_optimizer_configs_raise(tmp_path):
|
|
pytest.importorskip("unsloth")
|
|
from unsloth import GefenXConfig, GefenXMuonConfig
|
|
from unsloth.trainer import UnslothTrainingArguments
|
|
|
|
# Setting both Gefen-X configs is ambiguous (dispatch would silently pick one).
|
|
with pytest.raises(ValueError, match = "mutually exclusive"):
|
|
UnslothTrainingArguments(
|
|
output_dir = str(tmp_path / "conflict"),
|
|
gefenx_config = GefenXConfig(),
|
|
gefenx_muon_config = GefenXMuonConfig(),
|
|
report_to = "none",
|
|
)
|