fix params groups.trainable (#6354)

* add FGD distill code

* add configs

* add doc

* fix pretrain

* pre-commit

* fix ci

* fix readme

* fix readme

* fix ci

* fix param groups

* fix

* fix doc

* fix doc,test=document_fix

* fix params groups

ppdet/optimizer/optimizer.py

@@ -342,7 +342,7 @@ class OptimizerBuilder():
                     n: p
                     for n, p in model.named_parameters()
                     if any([k in n
-                            for k in group['params']] and p.trainable is True)
+                            for k in group['params']]) and p.trainable is True
                 }
                 _group = group.copy()
                 _group.update({'params': list(_params.values())})