Elementwise selecting of one of two inputs given a condition.

BS.Boolean.If (condition, thenValue, elseValue)

• condition: condition according to which element values are selected
• thenValue: element value selected if condition element is not 0
• elseValue: element value selected if condition element is 0

Sparse values are currently not supported.

A tensor of the dimension of the inputs. If any of the inputs have dimensions of 1, broadcasting is applied; in that case, the output dimension becomes the maximum over the corresponding three arguments' dimensions.

If() selects elements from two inputs based on a condition, in an elementwise fashion. For every input element where condition is non-0, the corresponding element from thenValue is chosen; and where condition is 0, the corresponding elseValue element is chosen.

This function supports broadcasting. For example, it is possible that the condition is a scalar, or one of the inputs is a constant tensor without time dimension.

The elementwise maximum of two inputs can be computed as a combination of Greater() and If():

MyElementwiseMax (a, b) = BS.Boolean.If (Greater (a, b), a, b)

This also works with broadcasting. For example, the linear rectifier can be written with this using a scalar constant as the second input:

MyReLU (x) = MyElementwiseMax (x, Constant(0))