code: def __neg__(self):
      if self.dtype.kind == "b":
          raise NotImplementedError(
              "negating a sparse boolean " "matrix is not supported"
          )
      return self._with_data(-self.data)
  
imports: import numpy
  from .base import spmatrix, _ufuncs_with_fixed_point_at_zero
  from .sputils import isscalarlike, validateaxis, matrix
label_desc: Use image node_id 9 for calling the _data_matrix obj's underlying member method code with example usage: obj.__neg__() and returns: self