Update builder for searcher

Signed-off-by: Junhwa Song <ethan9867@gmail.com>

Author: KKIEEK

siatune/ray/searchers/builder.py

@@ -7,8 +7,6 @@
 
 SEARCHERS = Registry('searchers')
 for func in set(tune.search.SEARCH_ALG_IMPORT.values()):
-    if not inspect.isfunction(func):
-        continue
     SEARCHERS.register_module(module=func())