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An n-way switch statement which calls a single branch function.

An n-way switch statement, implementing the following:
switch (branch_index) {
  case 0:
    output = branches[0](input);
  case 1:
    output = branches[1](input);
  case [[nbranches-1]]:
    output = branches[nbranches-1](input);

branch_index A Tensor of type int32. The branch selector, an int32 Tensor.
input A list of Tensor objects. A list of input tensors passed to the branch function.
Tout A list of tf.DTypes. A list of output types.
branches A list of functions decorated with @Defun that has length >= 1. A list of functions each of which takes 'inputs' and returns a list of tensors, whose types are the same as what every other branch returns.
output_shapes An optional list of shapes (each a tf.TensorShape or list of ints). Defaults to [].
name A name for the operation (optional).

A list of Tensor objects of type Tout.