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### エラー文
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```
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---------------------------------------------------------------------------
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ValueError Traceback (most recent call last)
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<ipython-input-92-de7e8c320f1e> in <module>()
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----> 1 perturbations = create_adversarial_pattern(image, label)
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7 frames
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<ipython-input-90-cf00bcaaa5e1> in create_adversarial_pattern(input_image, input_label)
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34 # print(input_image)
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35 print(gradient)
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---> 36 signed_grad = tf.sign(gradient)
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37 return signed_grad
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/util/dispatch.py in wrapper(*args, **kwargs)
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178 """Call target, and fall back on dispatchers if there is a TypeError."""
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179 try:
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--> 180 return target(*args, **kwargs)
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181 except (TypeError, ValueError):
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182 # Note: convert_to_eager_tensor currently raises a ValueError, not a
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/ops/math_ops.py in sign(x, name)
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578 tf.math.sign(x.values, ...), x.dense_shape).
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579 """
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--> 580 x = ops.convert_to_tensor(x)
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581 if x.dtype in (dtypes.complex64, dtypes.complex128):
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582 return gen_math_ops.div_no_nan(
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/ops.py in convert_to_tensor(value, dtype, name, as_ref, preferred_dtype, dtype_hint, ctx, accepted_result_types)
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1340 if ret is None:
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-> 1341 ret = conversion_func(value, dtype=dtype, name=name, as_ref=as_ref)
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1343 if ret is NotImplemented:
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/constant_op.py in _constant_tensor_conversion_function(v, dtype, name, as_ref)
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319 as_ref=False):
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320 _ = as_ref
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--> 321 return constant(v, dtype=dtype, name=name)
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/constant_op.py in constant(value, dtype, shape, name)
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260 """
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261 return _constant_impl(value, dtype, shape, name, verify_shape=False,
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--> 262 allow_broadcast=True)
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/constant_op.py in _constant_impl(value, dtype, shape, name, verify_shape, allow_broadcast)
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268 ctx = context.context()
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269 if ctx.executing_eagerly():
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--> 270 t = convert_to_eager_tensor(value, ctx, dtype)
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271 if shape is None:
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272 return t
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/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/constant_op.py in convert_to_eager_tensor(value, ctx, dtype)
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94 dtype = dtypes.as_dtype(dtype).as_datatype_enum
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95 ctx.ensure_initialized()
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---> 96 return ops.EagerTensor(value, ctx.device_name, dtype)
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ValueError: Attempt to convert a value (None) with an unsupported type (<class 'NoneType'>) to a Tensor.
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```
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