A Variable. Must be one of the following types: int32, int64.
Should be from a scalar Variable node.
limit
An int.
If incrementing ref would bring it above limit, instead generates an
'OutOfRange' error.
name
A name for the operation (optional).
Returns
A Tensor. Has the same type as ref.
A copy of the input before increment. If nothing else modifies the
input, the values produced will all be distinct.