Inconsistent mean residual deviance btwn gamma and tweedie (var power = 2)

Description

Using the same training frames, gamma GBMs return a mean residual deviance that is a (significant) additive (nearly) constant amount larger than the same GBM with distribution = 'tweedie' and tweedie_power ~= 2.

Note also that the documentation implies a tweedie variance power of 2 is supported but it errors out, saying it must be between 1 and 2, exclusive.
https://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/algo-params/tweedie_variance_power.html

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New H2O Bugs

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Reporter

Paul Donnelly

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