class_docstr: A helper class to keep track of registered py functions.
  
  FuncRegistry keeps a map from unique tokens (string) to python
  functions, which takes numpy arrays and outputs numpy arrays.
class_docstr_tok: ["A","helper","class","to","keep","track","of","registered","py","functions",".","FuncRegistry","keeps","a","map","from","unique","tokens","(","string",")","to","python","functions",",","which","takes","numpy","arrays","and","outputs","numpy","arrays","."]
docstr: Returns how many functions are currently registered.
code: def size(self):
      """Returns how many functions are currently registered."""
      return len(self._funcs)
  
imports: import functools
  import threading
  import traceback
  import weakref
  import numpy
  from tensorflow.python.autograph.impl import api
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager import backprop_util
  from tensorflow.python.eager import context
  from tensorflow.python.eager import record
  from tensorflow.python.framework import composite_tensor
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import func_graph
  from tensorflow.python.framework import function
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.framework import type_spec
  from tensorflow.python.lib.core import _pywrap_py_func
  from tensorflow.python.ops import autograph_ops
  from tensorflow.python.ops import gen_script_ops
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.util import compat
  from tensorflow.python.util import deprecation
  from tensorflow.python.util import dispatch
  from tensorflow.python.util import nest
  from tensorflow.python.util import tf_inspect
  from tensorflow.python.util import variable_utils
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 8 for calling the FuncRegistry obj's underlying member method code with example usage: obj.size() and returns: len