*Last updated: 2023-03-16.*
# tf_quant_finance.math.interpolation.cubic.BoundaryConditionType
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Specifies which boundary condition type to use for the cubic interpolation.
* `NATURAL`: the cubic interpolation set second derivative equal to zero
at boundaries.
* `CLAMPED`: the cubic interpolation set first derivative equal to zero
at boundaries.
* `FIXED_FIRST_DERIVATIVE`: the cubic interpolation set first derivative to
certain value at boundaries.
## Class Variables
* `CLAMPED`
* `FIXED_FIRST_DERIVATIVE`
* `NATURAL`