A mutable variable with Tensor value which holds a single real (Double) value. Unlike a DoubleValue, these can be used in DotFamilyWithStatistics because its value is a Tensor.
Value comparisons (as distinct from variable pointer equality)
Value comparisons (as distinct from variable pointer equality)
Assign a new value to this variable
Assign a new value to this variable
Abstract method to return the value of this variable.