1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
#!/usr/bin/env python
# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2018 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
import numpy as np
from pkg_resources import parse_version
def check_version(package, required_version):
"""
Check whether a given package version is superior or equal to required_version.
"""
try:
ver = getattr(package, "__version__")
except AttributeError:
try:
ver = getattr(package, "version")
except Exception:
return False
req_v = parse_version(required_version)
ver_v = parse_version(ver)
return ver_v >= req_v
class BaseFFT(object):
"""
Base class for all FFT backends.
"""
def __init__(self, **kwargs):
self.__get_args(**kwargs)
if self.shape is None and self.dtype is None and self.template is None:
raise ValueError("Please provide either (shape and dtype) or template")
if self.template is not None:
self.shape = self.template.shape
self.dtype = self.template.dtype
self.user_data = self.template
self.data_allocated = False
self.__calc_axes()
self.__set_dtypes()
self.__calc_shape()
def __get_args(self, **kwargs):
expected_args = {
"shape": None,
"dtype": None,
"template": None,
"shape_out": None,
"axes": None,
"normalize": "rescale",
}
for arg_name, default_val in expected_args.items():
if arg_name not in kwargs:
# Base class was not instantiated properly
raise ValueError("Please provide argument %s" % arg_name)
setattr(self, arg_name, default_val)
for arg_name, arg_val in kwargs.items():
setattr(self, arg_name, arg_val)
def __set_dtypes(self):
dtypes_mapping = {
np.dtype("float32"): np.complex64,
np.dtype("float64"): np.complex128,
np.dtype("complex64"): np.complex64,
np.dtype("complex128"): np.complex128
}
dp = {
np.dtype("float32"): np.float64,
np.dtype("complex64"): np.complex128
}
self.dtype_in = np.dtype(self.dtype)
if self.dtype_in not in dtypes_mapping:
raise ValueError("Invalid input data type: got %s" %
self.dtype_in
)
self.dtype_out = dtypes_mapping[self.dtype_in]
def __calc_shape(self):
# TODO allow for C2C even for real input data (?)
if self.dtype_in in [np.float32, np.float64]:
last_dim = self.shape[-1]//2 + 1
# FFTW convention
self.shape_out = self.shape[:-1] + (self.shape[-1]//2 + 1,)
else:
self.shape_out = self.shape
def __calc_axes(self):
default_axes = tuple(range(len(self.shape)))
if self.axes is None:
self.axes = default_axes
self.user_axes = None
else:
self.user_axes = self.axes
# Handle possibly negative axes
self.axes = tuple(np.array(default_axes)[np.array(self.user_axes)])
def _allocate(self, shape, dtype):
raise ValueError("This should be implemented by back-end FFT")
def set_data(self, dst, src, shape, dtype, copy=True):
raise ValueError("This should be implemented by back-end FFT")
def allocate_arrays(self):
if not(self.data_allocated):
self.data_in = self._allocate(self.shape, self.dtype_in)
self.data_out = self._allocate(self.shape_out, self.dtype_out)
self.data_allocated = True
def set_input_data(self, data, copy=True):
if data is None:
return self.data_in
else:
return self.set_data(self.data_in, data, self.shape, self.dtype_in, copy=copy, name="data_in")
def set_output_data(self, data, copy=True):
if data is None:
return self.data_out
else:
return self.set_data(self.data_out, data, self.shape_out, self.dtype_out, copy=copy, name="data_out")
def fft(self, array, **kwargs):
raise ValueError("This should be implemented by back-end FFT")
def ifft(self, array, **kwargs):
raise ValueError("This should be implemented by back-end FFT")
|
