code: def tocoo(self):
      rows = np.frombuffer(self.rows, dtype=np.int32)
      cols = np.frombuffer(self.cols, dtype=np.int32)
      data = np.frombuffer(self.data, dtype=self.dtype)
  
      return sp.coo_matrix((data, (rows, cols)), shape=self.shape)
  
imports: import array
  import numpy
  import scipy.sparse
  import sklearn.preprocessing
label_desc: Use image node_id 3 for calling the _IncrementalCOOMatrix obj's underlying member method code with example usage: obj.tocoo() and returns: sp