tf.while_loop

Repeat `body` while the condition `cond` is true.

```python
tf.while_loop(
    cond,
    body,
    loop_vars,
    shape_invariants=None,
    parallel_iterations=10,
    back_prop=True,
    swap_memory=False,
    name=None,
    maximum_iterations=None,
    return_same_structure=False
)
```

https://www.tensorflow.org/api_docs/python/tf/while_loop