szha commented on a change in pull request #18619:
URL: https://github.com/apache/incubator-mxnet/pull/18619#discussion_r455391942



##########
File path: python/mxnet/gluon/block.py
##########
@@ -1620,29 +1602,31 @@ def __init__(self, outputs, inputs, params=None):
 
         arg_types, aux_types = _infer_param_types(syms, out, arg_params, 
aux_params)
 
-        def _set_params_attr(name, **kwargs):
-            if params.get(name) is None:
-                param = Parameter(**kwargs)
-                param._name = name
-            else:
-                param = params[name]
-                param._check_and_setattr(**kwargs)
-            if self._structured_named:
-                lis = structure[name]
-                assert len(lis) > 0, "Can not find structured name for 
Parameter %s in 'params'. " \
-                    "Please check 'params' is complete!" % name
-                for structured_name in lis:
-                    self._reg_params[structured_name] = param
-            else:
-                self._reg_params[name] = param
+        if params is None:
+            params = {}
+        unused_params = set(params.keys()) - set(arg_params) - set(aux_params)
+        if len(unused_params) > 0:
+            raise ValueError('{} params are unused by the 
model.'.format(unused_params))

Review comment:
       I think we should probably include two switches to detect parameter set 
mismatch, ignore_extra_param and ignore_missing_param, with both default to 
False. if either case happens, we should raise ValueError with the complete 
information on what's extra and what's missing. Warning will often be visual 
noise that people ignore.




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