Skip start epoch and end epoch when dumping strategy in PaddleSlim (#19580)

test=develop

python/paddle/fluid/contrib/slim/core/config.py

@@ -27,7 +27,7 @@ __all__ = ['ConfigFactory']
 """This factory is used to create instances by loading and parsing configure file with yaml format.
 """
 
-PLUGINS = ['pruners', 'quantizers', 'quantizers', 'strategies', 'controllers']
+PLUGINS = ['pruners', 'quantizers', 'distillers', 'strategies', 'controllers']
 
 
 class ConfigFactory(object):

python/paddle/fluid/contrib/slim/core/strategy.py

@@ -29,6 +29,13 @@ class Strategy(object):
         self.start_epoch = start_epoch
         self.end_epoch = end_epoch
 
+    def __getstate__(self):
+        d = {}
+        for key in self.__dict__:
+            if key not in ["start_epoch", "end_epoch"]:
+                d[key] = self.__dict__[key]
+        return d
+
     def on_compression_begin(self, context):
         pass