Add lgb.unloader FAQ (#712)

bd4c4066 · Laurae · Guolin Ke · b10b350d · bd4c4066
Commit bd4c4066 authored Jul 20, 2017 by Laurae Committed by Guolin Ke Jul 20, 2017
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docs/FAQ.md docs/FAQ.md +6 -2

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 ### R-package

- **Question 1**: I used `setinfo`, tried to print my `lgb.Dataset`, and now the R console froze!
+- **Question 1**: Any training command using LightGBM does not work after an error occurred during the training of a previous LightGBM model.

- **Solution 1**: Avoid printing the `lgb.Dataset` after using `setinfo`. This is a known bug: [Microsoft/LightGBM#539](https://github.com/Microsoft/LightGBM/issues/539).
+- **Solution 1**: Run `lgb.unloader(wipe = TRUE)` in the R console, and recreate the LightGBM datasets (this will wipe all LightGBM-related variables). Due to the pointers, choosing to not wipe variables will not fix the error. This is a known issue: [Microsoft/LightGBM#698](https://github.com/Microsoft/LightGBM/issues/698).
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+- **Question 2**: I used `setinfo`, tried to print my `lgb.Dataset`, and now the R console froze!
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+- **Solution 2**: Avoid printing the `lgb.Dataset` after using `setinfo`. This is a known bug: [Microsoft/LightGBM#539](https://github.com/Microsoft/LightGBM/issues/539).

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