Enable LightGBM mixer for time series tasks

mindsdb / mindsdb_native

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Enable LightGBM mixer for time series tasks #453

Closed paxcema closed 3 years ago

paxcema commented 3 years ago

Why

Having more than one mixer can lead to improved predictions.

How

There was a check/guard in place to force NnMixer usage for time series tasks which this PR removes.

Additionally, this fixes a small bug in the confidence range reported for the default case in numerical tasks (when we're not able to find a bound with a specified width tolerance).