ViperEkura
acbe57a0f9
Add astrai/extension/dispatch.py: per-family decision tables over composable Specs, with explicit-strict / implicit-loose resolution, ASTR_OPS env overrides, profile presets, and explain traces. Migrate attention (behavior-preserving facade) and rotary onto it; new tests cover spec algebra, resolution semantics, and spec-vs-supports_call consistency.
389 lines
13 KiB
Python
389 lines
13 KiB
Python
"""Operator dispatch: one selection mechanism for all op families.
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A family registers an ordered list of ``ImplRecord`` rows (name, impl
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object, capability ``Spec``, machine-level ``available``). Resolution:
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explicit/context selection (strict — raises when incapable) > ``ASTR_OPS``
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env entry (soft — falls through) > first capable row > family fallback.
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``Spec`` is a composable predicate over ``CallContext``; the rows are the
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family's decision table, printable via ``explain``.
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Records flagged ``faithful=False`` change numerics (e.g. fp8) and are only
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reachable through an explicit selection, never the implicit chain.
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"""
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import contextvars
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import logging
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import os
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import threading
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from contextlib import contextmanager
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from dataclasses import dataclass, field, replace
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from typing import Any, Callable, Dict, List, Mapping, Optional, Tuple
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import torch
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logger = logging.getLogger(__name__)
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@dataclass(frozen=True)
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class CallContext:
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"""Axes a decision may depend on, snapshotted per call.
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``raw``/``raw_kwargs`` keep the original call so unregistered handles
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can still be probed through their own capability method.
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"""
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family: str
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fwd: Optional[str] = None
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dtype: Optional[torch.dtype] = None
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device_cuda: bool = False
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ndim: Optional[int] = None
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head_dim: Optional[int] = None
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has_cache: bool = False
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has_mask: bool = False
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grad_enabled: bool = True
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raw: Tuple[Any, ...] = ()
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raw_kwargs: Mapping[str, Any] = field(default_factory=dict)
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def evolve(self, **changes) -> "CallContext":
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return replace(self, **changes)
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class Spec:
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"""Composable, self-describing predicate over ``CallContext``."""
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__slots__ = ("_fn", "_desc")
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def __init__(self, fn: Callable[[CallContext], bool], desc: str):
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self._fn = fn
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self._desc = desc
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def matches(self, ctx: CallContext) -> bool:
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return bool(self._fn(ctx))
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@property
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def description(self) -> str:
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return self._desc
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def __and__(self, other: "Spec") -> "Spec":
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return Spec(
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lambda ctx: self._fn(ctx) and other._fn(ctx),
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f"({self._desc} and {other._desc})",
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)
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def __or__(self, other: "Spec") -> "Spec":
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return Spec(
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lambda ctx: self._fn(ctx) or other._fn(ctx),
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f"({self._desc} or {other._desc})",
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)
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def __invert__(self) -> "Spec":
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return Spec(lambda ctx: not self._fn(ctx), f"not({self._desc})")
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@classmethod
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def always(cls) -> "Spec":
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return cls(lambda ctx: True, "always")
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@classmethod
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def of(cls, fn: Callable[[CallContext], bool], desc: str) -> "Spec":
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return cls(fn, desc)
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@classmethod
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def dtype_in(cls, *dtypes: torch.dtype) -> "Spec":
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names = [str(getattr(d, "name", d)) for d in dtypes]
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return cls(
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lambda ctx: ctx.dtype in dtypes, f"dtype∈{{{','.join(names)}}}"
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)
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@classmethod
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def ndim(cls, n: int) -> "Spec":
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return cls(lambda ctx: ctx.ndim == n, f"ndim=={n}")
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@classmethod
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def head_dim_in(cls, *dims: int) -> "Spec":
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return cls(
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lambda ctx: ctx.head_dim in dims,
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f"head_dim∈{{{','.join(map(str, dims))}}}",
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)
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@classmethod
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def fwd_in(cls, *modes: Optional[str]) -> "Spec":
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names = [str(m) for m in modes]
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return cls(lambda ctx: ctx.fwd in modes, f"fwd∈{{{','.join(names)}}}")
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@classmethod
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def inference(cls) -> "Spec":
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return cls(lambda ctx: ctx.fwd is not None, "inference")
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@classmethod
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def training(cls) -> "Spec":
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return cls(lambda ctx: ctx.fwd is None, "training")
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@classmethod
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def no_grad(cls) -> "Spec":
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return cls(lambda ctx: not ctx.grad_enabled, "no_grad")
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@classmethod
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def has_cache(cls) -> "Spec":
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return cls(lambda ctx: ctx.has_cache, "has_cache")
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@classmethod
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def mask_free(cls) -> "Spec":
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return cls(lambda ctx: not ctx.has_mask, "mask_free")
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@classmethod
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def cuda_device(cls) -> "Spec":
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return cls(lambda ctx: ctx.device_cuda, "cuda_device")
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@dataclass(frozen=True)
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class ImplRecord:
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"""One decision-table row: an implementation plus its capability."""
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family: str
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name: str
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obj: Any
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spec: Spec
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available: Callable[[], bool] = lambda: True
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priority: int = 100
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faithful: bool = True
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@dataclass
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class OpFamily:
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name: str
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provider: Callable[[], List[ImplRecord]]
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fallback: Callable[[], ImplRecord]
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_FAMILIES: Dict[str, OpFamily] = {}
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_ENV_ALIASES: Dict[str, str] = {}
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_current_overrides: contextvars.ContextVar[Dict[str, Any]] = contextvars.ContextVar(
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"astrai_op_overrides", default={}
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)
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_env_lock = threading.Lock()
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_env_cache: Dict[tuple, Optional[Dict[str, str]]] = {}
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_warned: set = set()
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def register_family(
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name: str,
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provider: Callable[[], List[ImplRecord]],
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fallback: Callable[[], ImplRecord],
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) -> None:
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"""Register (or replace) a family; ``provider`` is re-evaluated per
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resolution so availability changes (tests, late imports) are honored."""
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_FAMILIES[name] = OpFamily(name, provider, fallback)
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def register_env_alias(family: str, varname: str) -> None:
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"""Legacy single-value env var for a family (e.g. attention →
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ASTR_BACKEND); an ASTR_OPS entry wins when both are set."""
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_ENV_ALIASES[family] = varname
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def _family(name: str) -> OpFamily:
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fam = _FAMILIES.get(name)
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if fam is None:
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raise KeyError(f"no operator family registered under {name!r}")
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return fam
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def _warn_once(message: str) -> None:
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if message not in _warned:
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_warned.add(message)
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logger.warning(message)
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def set_override(family: str, handle: Any) -> contextvars.Token:
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overrides = dict(_current_overrides.get())
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overrides[family] = handle
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return _current_overrides.set(overrides)
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def reset_override(token: contextvars.Token) -> None:
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_current_overrides.reset(token)
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def get_override(family: str) -> Optional[Any]:
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return _current_overrides.get().get(family)
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@contextmanager
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def op_backend(**handles: Any):
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"""Select implementations per family for the enclosed scope::
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with op_backend(attention="torch_native", rotary="torch"):
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engine.generate(...)
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String handles are validated eagerly against the family's currently
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available implementations; object handles pass through unchecked.
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"""
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for family, handle in handles.items():
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if isinstance(handle, str):
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fam = _FAMILIES.get(family)
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if fam is None:
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raise ValueError(f"unknown operator family {family!r}")
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if _record_for_handle(fam, handle) is None:
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raise ValueError(f"Unknown {family} implementation: {handle!r}")
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tokens = [set_override(f, h) for f, h in handles.items()]
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try:
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yield
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finally:
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for token in reversed(tokens):
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reset_override(token)
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def env_overrides() -> Dict[str, str]:
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"""Merged ASTR_OPS + legacy-alias selections (family or "profile").
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Cached per distinct env content; unknown families / malformed entries
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warn once and are dropped (soft override, never fatal).
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"""
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with _env_lock:
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merged: Dict[str, str] = {}
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raw = os.environ.get("ASTR_OPS", "").strip()
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if raw:
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key = ("ASTR_OPS", raw)
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if key not in _env_cache:
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parsed: Dict[str, str] = {}
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for item in raw.split(","):
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key_part, sep, value = item.strip().partition("=")
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key_part, value = key_part.strip(), value.strip()
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if not sep or not key_part or not value:
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_warn_once(f"ASTR_OPS: ignoring malformed entry {item!r}")
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continue
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parsed[key_part] = value
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_env_cache[key] = parsed or None
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merged.update(_env_cache[key] or {})
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for fam, varname in _ENV_ALIASES.items():
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raw = os.environ.get(varname, "").strip()
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if raw:
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key = (varname, raw)
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if key not in _env_cache:
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_env_cache[key] = {fam: raw.lower()}
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merged.setdefault(fam, _env_cache[key][fam])
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for fam in [f for f in merged if f not in _FAMILIES and f != "profile"]:
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_warn_once(f"ASTR_OPS: unknown operator family {fam!r}; dropping it")
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merged.pop(fam)
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return merged
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def env_selection(family: str) -> Optional[str]:
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return env_overrides().get(family)
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@dataclass(frozen=True)
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class Resolution:
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record: ImplRecord
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origin: str
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class ExplicitSelectionError(RuntimeError):
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"""An explicitly selected implementation cannot handle the call."""
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def _record_for_handle(fam: OpFamily, handle: Any) -> Optional[ImplRecord]:
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records = sorted(fam.provider(), key=lambda r: r.priority)
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if isinstance(handle, str):
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return next((r for r in records if r.name == handle), None)
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return next((r for r in records if r.obj is handle), None)
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def _adhoc_record(family: str, handle: Any) -> ImplRecord:
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"""Wrap an unregistered object; capability probes its own method."""
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supports = getattr(handle, "supports_call", None)
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if supports is not None:
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spec = Spec.of(
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lambda ctx: bool(supports(*ctx.raw, **ctx.raw_kwargs)),
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f"{type(handle).__name__}.supports_call",
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)
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else:
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spec = Spec.always()
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return ImplRecord(family, type(handle).__name__, handle, spec)
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def resolve(
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family: str, ctx: CallContext, explicit: Optional[Any] = None
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) -> Resolution:
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"""Resolve one family for one call (explicit-strict / implicit-loose)."""
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fam = _family(family)
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handle: Optional[Any] = None
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origin = "chain"
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if explicit is not None:
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handle, origin = explicit, "explicit"
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elif get_override(family) is not None:
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handle, origin = get_override(family), "context"
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else:
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env_name = env_selection(family)
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if env_name is not None:
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handle, origin = env_name, "env"
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if handle is not None:
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record = _record_for_handle(fam, handle)
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if record is None and not isinstance(handle, str):
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record = _adhoc_record(family, handle)
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if record is None:
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if origin in ("explicit", "context"):
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raise ValueError(f"Unknown {family} implementation: {handle!r}")
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_warn_once(f"ASTR_OPS: {family}={handle!r} is not registered; ignoring")
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else:
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if record.available() and record.spec.matches(ctx):
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return Resolution(record, origin)
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if origin in ("explicit", "context"):
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raise ExplicitSelectionError(
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f"Explicitly-set backend {type(record.obj).__name__} cannot "
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f"handle this {family} call; required: {record.spec.description}"
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)
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if handle is None and env_overrides().get("profile") == "reference":
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return Resolution(fam.fallback(), "profile")
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for record in sorted(fam.provider(), key=lambda r: r.priority):
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if record.available() and record.faithful and record.spec.matches(ctx):
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return Resolution(record, "chain")
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return Resolution(fam.fallback(), "fallback")
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def resolve_plan(ctxs: Mapping[str, CallContext]) -> Dict[str, Resolution]:
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"""Resolve several families at once (one decision snapshot)."""
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return {family: resolve(family, ctx) for family, ctx in ctxs.items()}
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def _describe_ctx(ctx: CallContext) -> str:
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parts = [f"fwd={ctx.fwd}", f"dtype={ctx.dtype}"]
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if ctx.ndim is not None:
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parts.append(f"ndim={ctx.ndim}")
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if ctx.head_dim is not None:
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parts.append(f"head_dim={ctx.head_dim}")
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parts += [f"cache={ctx.has_cache}", f"mask={ctx.has_mask}", f"grad={ctx.grad_enabled}"]
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return " ".join(parts)
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def explain(family: str, ctx: CallContext, explicit: Optional[Any] = None) -> str:
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"""Human-readable decision trace for one family."""
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fam = _family(family)
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records = sorted(fam.provider(), key=lambda r: r.priority)
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lines = [f"[{family}] {_describe_ctx(ctx)}"]
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for record in records:
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if not record.available():
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lines.append(f" {record.name}: SKIP unavailable")
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elif not record.faithful:
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lines.append(f" {record.name}: SKIP not faithful (explicit-only)")
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elif record.spec.matches(ctx):
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lines.append(f" {record.name}: MATCH ({record.spec.description})")
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else:
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lines.append(f" {record.name}: reject ({record.spec.description})")
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try:
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resolution = resolve(family, ctx, explicit)
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lines.append(f" => {resolution.record.name} (origin={resolution.origin})")
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except (ExplicitSelectionError, ValueError) as exc:
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lines.append(f" => ERROR: {exc}")
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return "\n".join(lines)
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def explain_plan(ctxs: Mapping[str, CallContext]) -> str:
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return "\n".join(explain(family, ctx) for family, ctx in ctxs.items())
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