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� Zd� ZdS )z*Indexing mixin for sparse matrix classes.
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Same as np.broadcast_arrays(a, b) but old writeability rules.
NumPy >= 1.17.0 transitions broadcast_arrays to return
read-only arrays. Set writeability explicitly to avoid warnings.
Retain the old writeability rules, as our Cython code assumes
the old behavior.
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IndexMixinzS
This class provides common dispatching and validation logic for indexing.
c �2 � | j rt d� � �dS )z�We do not currently support 1D sparse arrays.
This function is called each time that a 1D array would
result, raising an error instead.
Once 1D sparse arrays are implemented, it should be removed.
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