code: def add(self, watch_key, tensor_value):
      
      if watch_key not in self._tensor_data:
        self._tensor_data[watch_key] = _WatchStore(
            watch_key,
            mem_bytes_limit=self._watch_mem_bytes_limit)
      self._tensor_data[watch_key].add(tensor_value)
docs: Add a tensor value.
  
      Args:
        watch_key: A string representing the debugger tensor watch, e.g.,
          'Dense_1/BiasAdd:0:DebugIdentity'.
        tensor_value: The value of the tensor as a numpy.ndarray.