code: def from_netcdf(filename):
          
          groups = {}
          with nc.Dataset(filename, mode="r") as data:
              data_groups = list(data.groups)
  
          for group in data_groups:
              with xr.open_dataset(filename, group=group) as data:
                  groups[group] = data
          return InferenceData(**groups)
docs: Initialize object from a netcdf file.
  
          Expects that the file will have groups, each of which can be loaded by xarray.
  
          Parameters
          ----------
          filename : str
              location of netcdf file
  
          Returns
          -------
          InferenceData object