Jiaming Yuan d8ec7aad5a
[dask] Add a 1 line sample to infer output shape. (#6645)
* [dask] Use a 1 line sample to infer output shape.

This is for inferring shape with direct prediction (without DaskDMatrix).
There are a few things that requires known output shape before carrying out
actual prediction, including dask meta data, output dataframe columns.

* Infer output shape based on local prediction.
* Remove set param in predict function as it's not thread safe nor necessary as
we now let dask to decide the parallelism.
* Simplify prediction on `DaskDMatrix`.
2021-01-30 18:55:50 +08:00
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