preproc.alignment: import formatting

nabu/preproc/alignment.py

-import numpy as np
 import math
-
 import logging
+import numpy as np
 from numpy.polynomial.polynomial import Polynomial, polyval
-
-from nabu.utils import previouspow2
-from nabu.misc import fourier_filters
+from ..utils import previouspow2
+from ..misc import fourier_filters
 
 try:
     from scipy.ndimage.filters import median_filter
-
     import scipy.fft
-
     local_fftn = scipy.fft.rfftn
     local_ifftn = scipy.fft.irfftn
-
     __have_scipy__ = True
 except ImportError:
     from silx.math.medianfilter import medfilt2d as median_filter
     from silx.math.medianfilter import medfilt1d as median_filter_1d
-
     local_fftn = np.fft.fftn
     local_ifftn = np.fft.ifftn
-
     __have_scipy__ = False
-
 try:
     import matplotlib.pyplot as plt
     from mpl_toolkits.mplot3d import Axes3D
-
     __have_matplotlib__ = True
 except ImportError:
     logging.getLogger(__name__).warning("Matplotlib not available. Plotting disabled")
-
     __have_matplotlib__ = False