Revert "Merge branch 'feature-fedboard' of https://github.com/SMILELa…

…b-FL/FedLab into feature-fedboard"

This reverts commit ee06660, reversing
changes made to d342b34.

fedlab/contrib/client_sampler/uniform_sampler.py

@@ -1,4 +1,4 @@
-from fedlab.contrib.client_sampler.base_sampler import FedSampler
+from .base_sampler import FedSampler
 import numpy as np
 
 class RandomSampler(FedSampler):