class_docstr: weakref.ref object for tensors, np.ndarray, and structures.
  
  Invokes the callback when any element of the struct's ref-count drops to 0.
class_docstr_tok: ["weakref.ref","object","for","tensors",",","np.ndarray",",","and","structures",".","Invokes","the","callback","when","any","element","of","the","struct","'s","ref-count","drops","to","0","."]
code: def alive(self):
      return self._alive
  
imports: import collections
  import weakref
  import numpy
  import tensorflow.compat.v2
  from tensorflow.python.util import nest
label_desc: Use image node_id 2 for calling the WeakStructRef obj's underlying member method code with example usage: obj.alive() and returns: self