control flow v2 (cfv2) is an improved version of control flow in TensorFlow
with support for higher order derivatives. Enabling cfv2 will change the
graph/function representation of control flow, e.g., tf.while_loop and
tf.cond will generate functional While and If ops instead of low-level
Switch, Merge etc. ops. Note: Importing and running graphs exported
with old control flow will still be supported.
Calling tf.enable_control_flow_v2() lets you opt-in to this TensorFlow 2.0
feature.
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