def index(self):
if self._instantiated_index is None:
if self._index_class is None:
raise RuntimeError("You should not instantiate Dataset.")
self._instantiated_index = self._index_class(
self, dataset_type=self.dataset_type)
# Now we do things that we need an instantiated index for
# ...first off, we create our field_info now.
oldsettings = np.geterr()
np.seterr(all='ignore')
self.create_field_info()
np.seterr(**oldsettings)
return self._instantiated_index
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