Import errors

[guilhermebene]

I am getting some errors due to import issues.

• In spas/misc/statistics.py the following line is used import spyrit.misc.walsh_hadamard as wh but then some function calls do not start by wh as in:

  spyrit/spyrit/misc/statistics.py

  Line 183 in 8c80206

  H = walsh_matrix(len(img))

  spyrit/spyrit/misc/statistics.py

  Line 123 in 8c80206

  h_img = walsh_ordered2(img, H1d);

  In this case it seems I cannot train a new network because Stat_had() will fail.

• As mentioned in Error when creating a DenoiCompNet #39 some imports in spas/learning/model_Had_DCAN.py do not work, I have noticed 3 factors that may contribute to this: circular imports, imports using * (star imports) and relative and absolute imports being used in a same file.

• In a same file, imports like from ..misc.pattern_choice import Hadamard, matrix2conv (which is a relative import) and from spyrit.misc.statistics import * (which is not) are used, which I believe is not a best practice.

I believe it would be a good idea to review most of the imports in all relevant files, choose to use a method, i.e. relative imports, avoid star imports as much as possible and remove unnecessary legacy imports in file headers.

[tbaudier]

First point is done with 2e7df7f