code: def _get_dtype(self):
      return self.data.dtype
  
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 2 for calling the _data_matrix obj's underlying member method code with example usage: obj._get_dtype() and returns: self