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Return either true_fn() if predicate pred is true else false_fn().

If pred is a bool or has a constant value, we return either true_fn() or false_fn(), otherwise we use tf.cond to dynamically route to both.

pred A scalar determining whether to return the result of true_fn or false_fn.
true_fn The callable to be performed if pred is true.
false_fn The callable to be performed if pred is false.
name Optional name prefix when using tf.cond.

Tensors returned by the call to either true_fn or false_fn.

TypeError If true_fn or false_fn is not callable.