docstr: Elementwise negative.
docstr_tok: ["Elementwise","negative","."]
code: def __neg__(self):
      """Elementwise negative."""
      return self._with_data(-self.data)
  
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 5 for calling the _data_matrix obj's underlying member method code with example usage: obj.__neg__() and returns: self