[bug_fix] fix call_link_level_trainer() and call_node_level_trainer() #274
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This PR fixes
call_link_level_trainer()
andcall_node_level_trainer()
raisingValueError
whentrainer_type
doesn't match. When a custom trainer is registered, the above functions should returnNone
instead of raising the error, so thattrainer_builder
can properly get the custom trainer.