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topologies.py
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topologies.py
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# Copyright 2023 The JAX Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import annotations
import abc
from collections.abc import Sequence
from typing import Optional
import jax
from jax.experimental import mesh_utils
from jax._src.lib import xla_client as xc
from jax._src.lib import xla_extension
from jax._src import xla_bridge as xb
Device = xc.Device
class TopologyDescription:
def __init__(self, devices: list[Device]):
self.devices: list[Device] = devices
def get_attached_topology(platform=None) -> TopologyDescription:
return TopologyDescription(jax.devices(backend=platform))
def get_topology_desc(
topology_name: str = "", platform: str | None = None, **kwargs
) -> TopologyDescription:
if platform == "tpu" or platform is None:
return TopologyDescription(
xb.make_pjrt_tpu_topology(
topology_name, **kwargs
)._make_compile_only_devices()
)
try:
topology = xb.make_pjrt_topology(platform, topology_name, **kwargs)
return TopologyDescription(topology._make_compile_only_devices())
except xla_extension.XlaRuntimeError as e:
msg, *_ = e.args
if msg.startswith("UNIMPLEMENTED"):
raise NotImplementedError(msg) from e
else:
raise
# -- future mesh_utils --
def make_mesh(
topo: TopologyDescription,
mesh_shape: Sequence[int],
axis_names: tuple[str, ...],
*,
contiguous_submeshes: bool = False
) -> jax.sharding.Mesh:
devices = mesh_utils.create_device_mesh(
mesh_shape, list(topo.devices), contiguous_submeshes=contiguous_submeshes)
return jax.sharding.Mesh(devices, axis_names)