code: def _variable_is_read(varname, alloc):
      if alloc[varname] is inst.VariableAllocation.NULL:
          alloc[varname] = inst.VariableAllocation.TEMPORARY
  
file_path: probability/tensorflow_probability/python/experimental/auto_batching/allocation_strategy.py
imports: from absl import logging
  import six
  from tensorflow_probability.python.experimental.auto_batching import instructions
  from tensorflow_probability.python.experimental.auto_batching import liveness
label_desc: Use image node_id 3 for calling a global function with example usage: _variable_is_read(varname, alloc) without return types