corewise_sum
============

.. py:function:: t3toolbox.corewise.corewise_sum(X, axis = None)

   .. code-block:: python

      def corewise_sum(
              X:      NDArrayTree,                              # any nested tree of ints/floats/arrays
              axis:   typ.Union[int, typ.Sequence[int], None] = None,  # axis/axes summed in every leaf (None -> all)
      ) -> NDArrayTree:                                        # same tree structure as X, summed axes removed


   Sum each array in a nested object along the given axis or axes, X -> sum(X, axis).

   The same axis or axes are summed in every leaf array, leaving the tree structure intact.

   .. rubric:: Examples

   >>> import numpy as np
   >>> import t3toolbox.corewise as cw
   >>> X = (np.ones((2,3)), (np.ones((2,4)),))
   >>> print(cw.corewise_sum(X, axis=0))
   (array([2., 2., 2.]), (array([2., 2., 2., 2.]),))