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#!/usr/bin/env python
"""
Demonstrates how to use the PyCUDA interface to CUFFT to compute 1D FFTs.
"""
from __future__ import print_function
import pycuda.autoinit
import pycuda.gpuarray as gpuarray
import numpy as np
import skcuda.fft as cu_fft
print('Testing fft/ifft..')
N = 4096 * 16
x = np.asarray(np.random.rand(N), np.float32)
xf = np.fft.fft(x)
y = np.real(np.fft.ifft(xf))
x_gpu = gpuarray.to_gpu(x)
xf_gpu = gpuarray.empty(N//2+1, np.complex64)
plan_forward = cu_fft.Plan(x_gpu.shape, np.float32, np.complex64)
cu_fft.fft(x_gpu, xf_gpu, plan_forward)
y_gpu = gpuarray.empty_like(x_gpu)
plan_inverse = cu_fft.Plan(x_gpu.shape, np.complex64, np.float32)
cu_fft.ifft(xf_gpu, y_gpu, plan_inverse, True)
print('Success status: %r' % np.allclose(y, y_gpu.get(), atol=1e-6))
print('Testing in-place fft..')
x = np.asarray(np.random.rand(N) + 1j * np.random.rand(N), np.complex64)
x_gpu = gpuarray.to_gpu(x)
plan = cu_fft.Plan(x_gpu.shape, np.complex64, np.complex64)
cu_fft.fft(x_gpu, x_gpu, plan)
cu_fft.ifft(x_gpu, x_gpu, plan, True)
print('Success status: %r' % np.allclose(x, x_gpu.get(), atol=1e-6))
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