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When I try to freeze TF graph that uses tf.keras layers I get the following exception.

Traceback (most recent call last):
File "/home/ssd1/work/test/melodyExtraction_JDC/python36/lib/python3.6/site-packages/tensorflow/python/framework/importer.py", line 418, in import_graph_def
graph._c_graph, serialized, options) # pylint: disable=protected-access
tensorflow.python.framework.errors_impl.InvalidArgumentError: NodeDef expected inputs '' do not match 1 inputs specified; Op<name=Const; signature= -> output:dtype; attr=value:tensor; attr=dtype:type>; NodeDef: bidirectional_1/while/add/y = Constdtype=DT_INT32, value=Tensor<type: int32 shape: [] values: 1>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "keras_to_frozen.py", line 111, in
infer(out_filename, input_data)
File "keras_to_frozen.py", line 86, in infer
graph = tf.import_graph_def(graph_def, name="")
File "/home/ssd1/work/test/melodyExtraction_JDC/python36/lib/python3.6/site-packages/tensorflow/python/util/deprecation.py", line 454, in new_func
return func(*args, **kwargs)
File "/home/ssd1/work/test/melodyExtraction_JDC/python36/lib/python3.6/site-packages/tensorflow/python/framework/importer.py", line 422, in import_graph_def
raise ValueError(str(e))
ValueError: NodeDef expected inputs '' do not match 1 inputs specified; Op<name=Const; signature= -> output:dtype; attr=value:tensor; attr=dtype:type>; NodeDef: bidirectional_1/while/add/y = Constdtype=DT_INT32, value=Tensor<type: int32 shape: [] values: 1>

how to resove this problem?