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TensorFlow 2.0の「OperatorNotAllowedingRapherror」エラーを修復する方法

の公式チュートリアルからTensorFlow2.0を学びます 。結果を下記のコードから理解できます。

def square_if_positive(x):
  return [i ** 2 if i > 0 else i for i in x]
square_if_positive(range(-5, 5))

# result
[-5, -4, -3, -2, -1, 0, 1, 4, 9, 16]

ただし、このようなものと同じように、テンソルで入力を変更しない場合は、python CODE

def square_if_positive(x):
  return [i ** 2 if i > 0 else i for i in x]
square_if_positive(tf.range(-5, 5))

私は誤りを下回る！

OperatorNotAllowedInGraphError            Traceback (most recent call last)
<ipython-input-39-6c17f29a3443> in <module>
      2 def square_if_positive(x):
      3     return [i**2 if i > 0 else i for i in x]
----> 4 square_if_positive(tf.range(10))
      5 # measure_graph_size(square_if_positive, range(10))

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/eager/def_function.py in __call__(self, *args, **kwds)
    437     # This is the first call of __call__, so we have to initialize.
    438     initializer_map = {}
--> 439     self._initialize(args, kwds, add_initializers_to=initializer_map)
    440     if self._created_variables:
    441       try:

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/eager/def_function.py in _initialize(self, args, kwds, add_initializers_to)
    380     self._concrete_stateful_fn = (
    381         self._stateful_fn._get_concrete_function_internal_garbage_collected(  # pylint: disable=protected-access
--> 382             *args, **kwds))
    383 
    384     def invalid_creator_scope(*unused_args, **unused_kwds):

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/eager/function.py in _get_concrete_function_internal_garbage_collected(self, *args, **kwargs)
   1793     if self.input_signature:
   1794       args, kwargs = None, None
-> 1795     graph_function, _, _ = self._maybe_define_function(args, kwargs)
   1796     return graph_function
   1797 

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/eager/function.py in _maybe_define_function(self, args, kwargs)
   2093         graph_function = self._function_cache.primary.get(cache_key, None)
   2094         if graph_function is None:
-> 2095           graph_function = self._create_graph_function(args, kwargs)
   2096           self._function_cache.primary[cache_key] = graph_function
   2097         return graph_function, args, kwargs

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/eager/function.py in _create_graph_function(self, args, kwargs, override_flat_arg_shapes)
   1984             arg_names=arg_names,
   1985             override_flat_arg_shapes=override_flat_arg_shapes,
-> 1986             capture_by_value=self._capture_by_value),
   1987         self._function_attributes,
   1988         # Tell the ConcreteFunction to clean up its graph once it goes out of

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/framework/func_graph.py in func_graph_from_py_func(name, python_func, args, kwargs, signature, func_graph, autograph, autograph_options, add_control_dependencies, arg_names, op_return_value, collections, capture_by_value, override_flat_arg_shapes)
    851                                           converted_func)
    852 
--> 853       func_outputs = python_func(*func_args, **func_kwargs)
    854 
    855       # invariant: `func_outputs` contains only Tensors, CompositeTensors,

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/eager/def_function.py in wrapped_fn(*args, **kwds)
    323         # __wrapped__ allows AutoGraph to swap in a converted function. We give
    324         # the function a weak reference to itself to avoid a reference cycle.
--> 325         return weak_wrapped_fn().__wrapped__(*args, **kwds)
    326     weak_wrapped_fn = weakref.ref(wrapped_fn)
    327 

~/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/framework/func_graph.py in wrapper(*args, **kwargs)
    841           except Exception as e:  # pylint:disable=broad-except
    842             if hasattr(e, "ag_error_metadata"):
--> 843               raise e.ag_error_metadata.to_exception(type(e))
    844             else:
    845               raise

OperatorNotAllowedInGraphError: in converted code:

    <ipython-input-37-6c17f29a3443>:3 square_if_positive  *
        return [i**2 if i > 0 else i for i in x]
    /Users/zhangpan/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/framework/ops.py:547 __iter__
        self._disallow_iteration()
    /Users/zhangpan/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/framework/ops.py:540 _disallow_iteration
        self._disallow_when_autograph_enabled("iterating over `tf.Tensor`")
    /Users/zhangpan/tf2_workspace/tf2.0/lib/python3.6/site-packages/tensorflow_core/python/framework/ops.py:518 _disallow_when_autograph_enabled
        " decorating it directly with @tf.function.".format(task))

    OperatorNotAllowedInGraphError: iterating over `tf.Tensor` is not allowed: AutoGraph did not convert this function. Try decorating it directly with @tf.function.

このエラーに関する仕様が見つかりません。本当の理由は「tf.Tensorを繰り返すことは許可されていない」ではないと思います。私はこのように書くことができるようになります。

@tf.function
def square_if_positive(x):
    for i in x:
        if i>0:
            tf.print(i**2)
        else:
            tf.print(i)
square_if_positive(tf.range(10))

私は上のコードのようにテンソルを繰り返します。

だから私の質問は、本当の理由このエラーについてのものですか？どんな提案も私を助けるでしょう。私はたくさんの素材を読んだことを通してこのエラーを理解することはできません。

functionloopstensorflow2.0batching
13
sunny

それが誰かに役立ちます。

私はしたコードについて同じ問題がありました：

for index, image in enumerate(inputs):
    ... My code ...
 _

解決策はただのことです。

index = 0
for image in inputs:
    .... My code ...
    index += 1
 _
2
Agustin Barrachina