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154e4506c0
The main aim here is to clean up lax.linalg to make it a bit easier to maintain and update with new features (e.g. batch partitioning - coming soon!). In this change, I removes some code duplication by consolidate most of the lowering logic into a helper function, and identifying some other common patterns. As part of this, I moved the remaining lowering rules from `jaxlib.lapack` into `lax.linalg`. PiperOrigin-RevId: 725223882
60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
# Copyright 2018 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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import numpy as np
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from jaxlib import xla_client
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from .cpu import _lapack
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from .cpu._lapack import eig
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from .cpu._lapack import schur
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for _name, _value in _lapack.registrations().items():
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xla_client.register_custom_call_target(
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_name,
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_value,
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platform="cpu",
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api_version=(1 if _name.endswith("_ffi") else 0),
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)
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EigComputationMode = eig.ComputationMode
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SchurComputationMode = schur.ComputationMode
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SchurSort = schur.Sort
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LAPACK_DTYPE_PREFIX = {
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np.float32: "s",
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np.float64: "d",
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np.complex64: "c",
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np.complex128: "z",
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}
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def prepare_lapack_call(fn_base, dtype):
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"""Initializes the LAPACK library and returns the LAPACK target name."""
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_lapack.initialize()
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return build_lapack_fn_target(fn_base, dtype)
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def build_lapack_fn_target(fn_base: str, dtype) -> str:
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"""Builds the target name for a LAPACK function custom call."""
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try:
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prefix = (
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LAPACK_DTYPE_PREFIX.get(dtype, None) or LAPACK_DTYPE_PREFIX[dtype.type]
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)
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return f"lapack_{prefix}{fn_base}"
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except KeyError as err:
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raise NotImplementedError(err, f"Unsupported dtype {dtype}.") from err
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