Invalid import in hazard.base.py

[raphael-portmann]

There is an invalid import in hazard.base.py of the develop branch which could be removed (see below)

     39 from rasterio.features import rasterize
     40 from rasterio.warp import reproject, Resampling, calculate_default_transform
---> 41 import sparse as sp
     42 from scipy import sparse
     43 import xarray as xr

this file:

climada_python/climada/hazard/base.py

Line 41 in d244150

import sparse as sp

and the code on line 726 would have to be changed from
sp.COO.from_numpy,
to
sparse.COO.from_numpy,

[peanutfun]

We import two different modules here, scipy.sparse and sparse. The latter includes a sparse array that implements the entire numpy.ndarray interface, which is why I introduced it in #578, see #544 for the discussion.

In summary (and only in climada/hazard/base.py!):

• sparse = scipy.sparse
• sp = sparse, NOT scipy.sparse

I agree that this is confusing but it was a way of not altering any other code using scipy.sparse in that file.

Finally, note that you need to update your conda environment if you encounter ModuleNotFoundError: No module named 'sparse'