DLT and LGT models cannot handle negative response values

[Okroshiashvili]

Describe the bug
In the documentation you mention that LGT cannot handle negative values of response variable. However, I encountered the same error using DLT model.

Does DLT handle negative values in response variable?

Screenshots
DLT model

I have same error when using LGT model

Environment (please complete the following information):

• OS: Ubuntu 18.04
• Python Version: 3.7

Additional context

I use Orbit version 1.0.14dev

[wangzhishi]

@Okroshiashvili just to confirm before we proceed to fix this bug, are the values in your response variable all negative?

[Okroshiashvili]

Hi @wangzhishi .Yes, all values in response are negative. To reproduce the behavior, sample random variables in (0, 1] interval and then take natural logarithm.

[wangzhishi]

we merged a PR to dev branch to solve this bug. please try it out. thanks!