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