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[SPARK-18929][ML] Add Tweedie distribution in GLM
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## What changes were proposed in this pull request?
I propose to add the full Tweedie family into the GeneralizedLinearRegression model. The Tweedie family is characterized by a power variance function. Currently supported distributions such as Gaussian, Poisson and Gamma families are a special case of the Tweedie https://en.wikipedia.org/wiki/Tweedie_distribution.

yanboliang srowen sethah

Author: actuaryzhang <[email protected]>
Author: Wayne Zhang <[email protected]>

Closes apache#16344 from actuaryzhang/tweedie.
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@actuaryzhang @uzadude
actuaryzhang authored and uzadude committed Jan 27, 2017
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