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+``bit_count`` to compute the number of 1-bits in an integer
+-----------------------------------------------------------
+
+Computes the number of 1-bits in the absolute value of the input.
+This works on all the numpy integer types. Analogous to the builtin
+``int.bit_count`` or ``popcount`` in C++.
+
+.. code-block:: python
+
+ >>> np.uint32(1023).bit_count()
+ 10
+ >>> np.int32(-127).bit_count()
+ 7