Reduce/check dependencies

[nducros]

[Issue from @cohenjer]

Check if the following are still required

• PyWavelets (je crois qu'il est pas utilisé ?)
• Pillow (utile pour build les tutos, donc pas pour un utilisateur)
• wget (pas utilisé explicitement?)
• imageio (importé mais pas utilisé ?)
• astropy (utilisé pour de la visu d'une image spécifique)
• requests et girder qui sont utiles pour les gens du labo avec girder mais c'est tout ?

Minimal installation with :

    "numpy",
    "matplotlib",
    "scipy",
    "torch",
    "torchvision",
    "sympy".

[tbaudier]

astropy: @tbaudier -> removed
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/data_visualisation.py#L15

sympy @tbaudier -> GrayCode cannot be removed and sympy is a dependency of pytorch
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/walsh_hadamard.py#L46

imageio
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/metrics.py#L15 -> not used

PyWavelets - pywt -> optional import
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/pattern_choice.py#L20 @nducros

Pillow - PIL @tbaudier -> removed
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/statistics.py#L4
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/load_data.py#L19
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/disp.py#L9 -> not used

tqdm @tbaudier -> tqdm is very light and pytorch use it -> to keep
https://github.com/openspyrit/spyrit/blob/master/spyrit/hadamard_matrix/download_hadamard_matrix.py#L6

requests @tbaudier -> optional import
https://github.com/openspyrit/spyrit/blob/master/spyrit/hadamard_matrix/download_hadamard_matrix.py#L2

girder_client (lazy loading) @tbaudier -> optional import
https://github.com/openspyrit/spyrit/blob/master/spyrit/hadamard_matrix/download_hadamard_matrix.py#L23
https://github.com/openspyrit/spyrit/blob/master/spyrit/misc/load_data.py#L115

optional import in pyproject -> name: full

[cohenjer]

@tbaudier Thanks for the check.

My thought was also that we could add an option for minimal installation in the .toml file. Without astropy, PyWavelets and Pillow, the package may be installed and used depending on how you setup the init.py.

• PyWavelets is used to generate Haar and Daubechie wavelets; as long as the user does not need them (and probably most users don't), the package does not need to be imported.
• Astropy is only used for the astropy.io.fits.open module. I wonder if the regular import from torchvision would not be ok ? Also this is only used to open the zebra fish data, why does this need to be in the package ? The data cannot even be downloaded from the package right ?
• Pillow is used in statistics.py line 1264. Again probably we can use a function from torch to do this ? It is used in load_data only for the module PIL.Image.open in several places.

We could in fact open an issue to use a more unified approach to loading data ?