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feat(functions): support GPU resource requirements (#4085)

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Functions can describe their Python environment today, but cannot
declare accelerator requirements. That prevents Sophon from scheduling
computed-column UDF refreshes onto GPU workers from the immutable
Function definition.

Add `num_gpus` to Python `@udf` through a typed
`FunctionResourceRequirements` value and represent resource-aware
definitions with the `python_v2` runtime discriminator. CPU Functions
retain their existing `python` encoding and canonical identity.

The new discriminator is intentional for mixed-version safety:
deployments that do not understand execution resources reject the
runtime instead of accepting a new field and silently running the
Function on CPU. Required resources are part of Function version
identity; priority, concurrency, and retry policy remain Job concerns.
The actual resource scheduling remains owned by Sophon.
This commit is contained in:
Xuanwo
2026-08-30 23:10:08 +08:00
committed by GitHub
parent fcdc3f949e
commit a417e46bfa
3 changed files with 260 additions and 31 deletions
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python/python/lancedb/functions.py
+57 -3
View File
@@ -54,6 +54,18 @@ _UInt32 = conint(strict=True, ge=0, le=2**32 - 1)
_UInt64 = conint(strict=True, ge=0, le=2**64 - 1)
def _validate_gpu_wire_marker(value: Any) -> bool:
if value is not True:
raise ValueError("runtime.gpu must be true")
return True
def _normalize_gpu_marker(value: bool) -> Optional[bool]:
if not isinstance(value, bool):
raise ValueError("gpu must be a boolean")
return True if value else None
class _FrozenDict(dict):
def _immutable(self, *args, **kwargs):
raise TypeError("remote canonical values are immutable")
@@ -239,6 +251,23 @@ class PythonRuntimeSpec(_RemoteValue):
python_version: Optional[str] = None
environment: Optional[PythonEnvironmentSpec] = None
env: Optional[Mapping[str, str]] = None
gpu: Optional[bool] = None
@model_validator(mode="before")
@classmethod
def _discard_unknown_runtime_payload(cls, value):
if isinstance(value, Mapping):
kind = value.get("kind")
if isinstance(kind, str) and kind not in {"python", "python_v2"}:
return {"kind": kind}
return value
@field_validator("gpu", mode="before")
@classmethod
def _validate_gpu_marker(cls, value):
if value is None:
return None
return _validate_gpu_wire_marker(value)
@model_validator(mode="after")
def _validate_runtime_kind(self):
@@ -247,18 +276,28 @@ class PythonRuntimeSpec(_RemoteValue):
raise ValueError("python runtime requires python_version")
if self.environment is None:
raise ValueError("python runtime requires environment")
if self.gpu is not None:
raise ValueError("python runtime with gpu requires kind='python_v2'")
elif self.kind == "python_v2":
if self.python_version is None:
raise ValueError("python_v2 runtime requires python_version")
if self.environment is None:
raise ValueError("python_v2 runtime requires environment")
if self.gpu is None:
raise ValueError("python_v2 runtime requires gpu")
else:
object.__setattr__(self, "python_version", None)
object.__setattr__(self, "environment", None)
object.__setattr__(self, "env", None)
object.__setattr__(self, "gpu", None)
return self
class FunctionVersion(_RemoteValue):
"""An exact immutable Function version returned by Enterprise.
Scheduling resources, priority, concurrency, and retry policy belong to
the submitting Job and are not part of this identity.
The GPU execution requirement is part of this identity. CPU and memory sizing,
priority, concurrency, and retry policy belong to the execution platform.
"""
name: str
@@ -996,6 +1035,7 @@ class UdfDefinition:
pip: tuple[str, ...],
env: Mapping[str, str],
python_version: Optional[str],
gpu: bool = False,
conda: tuple[str, ...] = (),
conda_channels: tuple[str, ...] = (),
):
@@ -1024,12 +1064,14 @@ class UdfDefinition:
signature = _infer_signature(function, input_schema, output_schema)
source = _package_source(function)
digest = f"sha256:{hashlib.sha256(source).hexdigest()}"
gpu_marker = _normalize_gpu_marker(gpu)
runtime = PythonRuntimeSpec(
kind="python",
kind="python_v2" if gpu_marker is not None else "python",
python_version=python_version
or f"{sys.version_info.major}.{sys.version_info.minor}",
environment=environment_spec,
env=environment,
gpu=gpu_marker,
)
self._function = function
self._request = FunctionRegistrationRequest(
@@ -1075,6 +1117,7 @@ def udf(
pip: tuple[str, ...] | list[str] = (),
env: Optional[Mapping[str, str]] = None,
python_version: Optional[str] = None,
gpu: bool = False,
conda: tuple[str, ...] | list[str] = (),
conda_channels: tuple[str, ...] | list[str] = (),
) -> Callable[[Callable[..., Any]], UdfDefinition]: ...
@@ -1089,6 +1132,7 @@ def udf(
pip: tuple[str, ...] | list[str] = (),
env: Optional[Mapping[str, str]] = None,
python_version: Optional[str] = None,
gpu: bool = False,
conda: tuple[str, ...] | list[str] = (),
conda_channels: tuple[str, ...] | list[str] = (),
):
@@ -1121,6 +1165,10 @@ def udf(
Environment variables included in the Function definition.
python_version : str, optional
Remote Python major/minor version. Defaults to the client version.
gpu : bool, default False
Whether every remote execution requires a GPU. The execution platform
selects one compatible GPU for each worker. The requirement is part of
the immutable Function version.
The packaged artifact is a snapshot: the function source plus exactly
the module-level names it references (modules as imports, importable
@@ -1145,6 +1193,11 @@ def udf(
... return value * 2
>>> score(1.5)
3.0
>>> @udf(pip=["cupy-cuda12x"], gpu=True)
... def gpu_score(value: int) -> int:
... return value * 2
>>> gpu_score.registration_request.runtime.gpu
True
"""
def decorate(target: Callable[..., Any]) -> UdfDefinition:
@@ -1156,6 +1209,7 @@ def udf(
pip=tuple(pip),
env={} if env is None else env,
python_version=python_version,
gpu=gpu,
conda=tuple(conda),
conda_channels=tuple(conda_channels),
)
python/python/tests/test_first_class_function_slice2.py
+53 -1
View File
@@ -19,7 +19,7 @@ import pyarrow as pa
import pytest
import lancedb
from lancedb.functions import UdfDefinition, udf
from lancedb.functions import PythonRuntimeSpec, UdfDefinition, udf
THRESHOLD = 20
_CACHE = None
@@ -89,6 +89,58 @@ def test_udf_conda_environment():
udf(name="channels", conda_channels=["conda-forge"])(lambda value: value)
def test_udf_gpu_marker_uses_gpu_runtime():
@udf(pip=["cupy-cuda12x"], gpu=True)
def double_on_gpu(value: int) -> int:
return value * 2
request = json.loads(double_on_gpu.registration_request.to_canonical_json())
assert request["runtime"]["kind"] == "python_v2"
assert request["runtime"]["gpu"] is True
@udf(pip=["pyarrow"])
def cpu_function(value: int) -> int:
return value
cpu_runtime = json.loads(cpu_function.registration_request.to_canonical_json())[
"runtime"
]
assert cpu_runtime["kind"] == "python"
assert "gpu" not in cpu_runtime
def identity(value: int) -> int:
return value
for invalid in [None, 0, 1, -1, 1.5, "", "true", "1", "H100"]:
with pytest.raises(ValueError, match="gpu must be a boolean"):
udf(name="invalid_gpu", gpu=invalid)(identity)
base_runtime = {
"kind": "python_v2",
"python_version": "3.12",
"environment": {"kind": "pip"},
}
runtime = PythonRuntimeSpec.model_validate({**base_runtime, "gpu": True})
assert runtime.gpu is True
for invalid in [False, 1, 0, "", "true", "1", "H100"]:
with pytest.raises(ValueError, match="runtime.gpu must be true"):
PythonRuntimeSpec.model_validate({**base_runtime, "gpu": invalid})
def test_unknown_runtime_discards_payload_before_known_field_validation():
for payload in [
{"kind": "python_v3", "gpu": {"model": "H100"}},
{"kind": "python_v3", "resources": []},
{
"kind": "python_v3",
"environment": {"kind": []},
"python_version": 3.15,
},
]:
runtime = PythonRuntimeSpec.model_validate(payload)
assert runtime.to_canonical_json() == '{"kind":"python_v3"}'
def test_udf_packages_attribute_access_and_body_imports():
@udf
def word_norm(body: str) -> float: