docstr: Data type of the matrix.
docstr_tok: ["Data","type","of","the","matrix","."]
code: def dtype(self):
      """Data type of the matrix."""
      return self.data.dtype
  
imports: import cupy
  import numpy
  from cupy._core import internal
  from cupy import _util
  from cupyx.scipy.sparse import _base
  from cupyx.scipy.sparse import _coo
  from cupyx.scipy.sparse import _sputils
label_desc: Use image node_id 2 for calling the _data_matrix obj's underlying member method code with example usage: obj.dtype() and returns: self