Function _Enter

Creates or finds a child frame, and makes `data` available to it. The unique `frame_name` is used by the `Executor` to identify frames. If `is_constant` is true, `data` is a constant in the child frame; otherwise it may be changed in the child frame. At most `parallel_iterations` iterations

(data,
           frame_name,
           is_constant=False,
           parallel_iterations=10,
           use_ref=True,
           use_input_shape=True,
           name=None)