Added identity init to CoupledRationalQuadraticSpline #55
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Issue
Initializing the flow as an identity transform is exceptionally useful for training and is supported by the classes in the
wrapper.py
file such asAutoregressiveRationalQuadraticSpline
CircularAutoregressiveRationalQuadraticSpline
andCircularCoupledRationalQuadraticSpline
but notCoupledRationalQuadraticSpline
Solution
Added
init_identity
toCoupledRationalQuadraticSpline
in a way that is consistent with the other classes.