tf.placeholder_with_default(input, shape, name=None)See the guide: Inputs and Readers > Placeholders
A placeholder op that passes through input when its output is not fed.
input: A Tensor. The default value to produce when output is not fed.shape: A tf.TensorShape or list of ints. The (possibly partial) shape of the tensor.name: A name for the operation (optional).A Tensor. Has the same type as input. A placeholder tensor that defaults to input if it is not fed.
Defined in tensorflow/python/ops/gen_array_ops.py.
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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/api_docs/python/tf/placeholder_with_default