'_OptionalInputPlaceHolder' object has no attribute 'inbound_nodes'

[weilaweila]

model = Seq2Seq(batch_input_shape=(16, 7, 5), hidden_dim=10, output_length=8, output_dim=20, depth=4, peek=True) AttributeError: '_OptionalInputPlaceHolder' object has no attribute 'inbound_nodes'

[natank1]

Suffered from the same problem

[harvcode]

I get this error even for the Simple RNN demo.

[tinglo]

I got the same problem.

[harvcode]

Confirmed same issue with both Theano and Tensorflow backends.

[harvcode]

When used together with Keras 2.1.0 the issue doesn't occur.

[tskoba]

I found https://github.com/tensorflow/cleverhans/pull/341 may help.

[macgaf]

Pls modify code at line 841~851 in engine.py inbound_nodes -> _inbound_nodes Just as below:

---

    if num == 1:
        optional_input_placeholder = _to_list(_OptionalInputPlaceHolder()._inbound_nodes[0].output_tensors)[0]
        assert self._is_optional_input_placeholder(optional_input_placeholder)
        return optional_input_placeholder
    else:
        y = []
        for _ in range(num):
            optional_input_placeholder = _to_list(_OptionalInputPlaceHolder()._inbound_nodes[0].output_tensors)[0]
            assert self._is_optional_input_placeholder(optional_input_placeholder)
            y.append(optional_input_placeholder)
        return y

[natank1]

Yes I already found it out

Thanks!!

On Fri, Feb 2, 2018 at 5:39 AM, macgaf notifications@github.com wrote:

Pls modify code at line 841~851 in engine.py inbound_nodes -> _inbound_nodes Just as below:

if num == 1:
    optional_input_placeholder = _to_list(_OptionalInputPlaceHolder()._inbound_nodes[0].output_tensors)[0]
    assert self._is_optional_input_placeholder(optional_input_placeholder)
    return optional_input_placeholder
else:
    y = []
    for _ in range(num):
        optional_input_placeholder = _to_list(_OptionalInputPlaceHolder()._inbound_nodes[0].output_tensors)[0]
        assert self._is_optional_input_placeholder(optional_input_placeholder)
        y.append(optional_input_placeholder)
    return y

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[ETMayberry]

duplicated by #90

[paul-cb]

I made this change but it still doesn't work.

[yasuyukiokubo]

Have you changed correct engine.py?

[deepakkumar1984]

I still get the issue with the modified code:

[cdhx]

there are two engine.py,one is in build/lib, the other is in recurentshop,is this two py the same? why my engine 841-851 line are like this ,should i change code as you said? `def get_cell(self, kwargs): return RNNCellFromModel(self.model, kwargs)

def _get_optional_input_placeholder(self, name=None, num=1):
    if name:
        if name not in self._optional_input_placeholders:
            if num > 1:
                self._optional_input_placeholders[name] = [self._get_optional_input_placeholder() for _ in range(num)]
            else:
                self._optional_input_placeholders[name] = self._get_optional_input_placeholder()
        return self._optional_input_placeholders[name]`