.. _op_ai_onnx_If-1:

If - version 1
==============

This page documents version **1** of operator **If**. See :doc:`If` for the latest version (since version 13).

- **Domain**: ``ai.onnx``
- **Since version**: 1

If conditional

**Inputs**

- **cond** (*B*): Condition for the if. The tensor must contain a single element.

**Outputs**

- **outputs** (*V*): Values that are live-out to the enclosing scope. The return values in the ``then_branch`` and ``else_branch`` must be of the same shape and same data type.

**Type Constraints**

- **V**: All Tensor types
  Allowed types: tensor(bool), tensor(complex128), tensor(complex64), tensor(double), tensor(float), tensor(float16), tensor(int16), tensor(int32), tensor(int64), tensor(int8), tensor(string), tensor(uint16), tensor(uint32), tensor(uint64), tensor(uint8).
- **B**: Only bool
  Allowed types: tensor(bool).