code: def is_tensor(obj):
      return is_sparse(obj)
  
imports: from copy import copy
  from packaging.version import Version
  import numpy
  import scipy
  import scipy.linalg
  import scipy.sparse.linalg
  import sparse
  from .None import register_sparse_backend
  from ....backend.core import Backend
label_desc: Use image node_id 3 for calling the NumpySparseBackend obj's underlying member method code with example usage: obj.is_tensor(obj) and returns: is_sparse