Convert a binary quadratic model to NumPy 2D array.

Parameters:variable_order (list, optional) – If provided, indexes the rows/columns of the NumPy array. If variable_order includes any variables not in the binary quadratic model, these are added to the NumPy array.
Returns:The binary quadratic model as a NumPy 2D array. Note that the binary quadratic model is converted to BINARY vartype.
Return type:numpy.ndarray


This method will be deprecated in the future. The preferred pattern is to use to_dense().