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``bit_count`` to compute the number of 1-bits in an integer
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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
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