mirror of
https://github.com/ROCm/jax.git
synced 2025-04-24 19:16:06 +00:00
5d1c014509
This change creates a new fft primitive in lax, and uses it to implement numpy's np.fft.fftn function. Not-yet-implemented functionality: - vmap - 's' argument of fftn - other numpy np.fft functions Resolves #505.
49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
# Copyright 2019 Google LLC
|
|
#
|
|
# 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 absolute_import
|
|
from __future__ import division
|
|
from __future__ import print_function
|
|
|
|
from jax.abstract_arrays import ShapedArray
|
|
from jax.core import Primitive
|
|
from jax.interpreters import xla
|
|
from ..interpreters import ad
|
|
|
|
|
|
def fft(x, fft_type, fft_lengths=None):
|
|
if fft_lengths is None:
|
|
fft_lengths = x.shape
|
|
else:
|
|
fft_lengths = tuple(fft_lengths)
|
|
return fft_p.bind(x, fft_type=fft_type, fft_lengths=fft_lengths)
|
|
|
|
def fft_impl(x, fft_type, fft_lengths):
|
|
return xla.apply_primitive(fft_p, x, fft_type=fft_type, fft_lengths=fft_lengths)
|
|
|
|
def fft_abstract_eval(x, fft_type, fft_lengths):
|
|
return ShapedArray(x.shape, x.dtype)
|
|
|
|
def fft_translation_rule(c, x, fft_type, fft_lengths):
|
|
return c.Fft(x, fft_type, fft_lengths)
|
|
|
|
def fft_transpose_rule(t, fft_type, fft_lengths):
|
|
return fft(t, fft_type, fft_lengths),
|
|
|
|
fft_p = Primitive('fft')
|
|
fft_p.def_impl(fft_impl)
|
|
fft_p.def_abstract_eval(fft_abstract_eval)
|
|
xla.translations[fft_p] = fft_translation_rule
|
|
ad.deflinear(fft_p, fft_transpose_rule)
|