Address PR comments

Signed-off-by: Serge Panev <[email protected]>
apache · Jul 6, 2020 · 80beb4b · 80beb4b
1 parent 11a7a5c
commit 80beb4b
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Showing 2 changed files with 14 additions and 6 deletions.
diff --git a/python/mxnet/gluon/block.py b/python/mxnet/gluon/block.py
@@ -1068,6 +1068,11 @@ def _build_cache(self, *args):
         input_names = out.list_inputs()
         data_indices = []
         param_indices = []
+
+        # In the default case, _cached_ops_args contains all the parameters from params (the sets are identical)
+        # In the case of Partition API optimized graph _cached_ops_args might contain some parameters from params,
+        # might contain some new parameters created during optimization and added to `arg_dict/aux_dict`,
+        # and might not contain some parameters that were deleted during optimization.
         self._cached_op_args = []
         for i, name in enumerate(input_names):
             pair = None
@@ -1079,13 +1084,15 @@ def _build_cache(self, *args):
                 if name in params:
                     param = params[name]
                 else:
-                    assert self._backend, "Parameter " + name + " is missing from block params"
+                    # The param is missing from the original params dictionary, which means the param must have
+                    # been added by the Partition API backend
                     if name in arg_dict or name:
                         param_data = arg_dict[name]
                     elif name in aux_dict:
                         param_data = aux_dict[name]
                     else:
-                        raise RuntimeError('Expected inputs missing from arg and aux after partioning. '
+                        raise RuntimeError('A parameter was added to the graph during optimization but it was not '
+                                           'added to the parameter dicts.\n'
                                            'Please check the backend.')
 
                     param = Parameter(name)

diff --git a/python/mxnet/symbol/symbol.py b/python/mxnet/symbol/symbol.py
@@ -1557,8 +1557,9 @@ def optimize_for(self, backend, args=None, aux=None, ctx=None, **kwargs):
                     if a_n in args:
                         args.pop(a_n)
             else:
-                warnings.warn('optimize_for deleted some argument. \n' +
-                              'Provide a dictionary to the arg argument to optimize_for')
+                warnings.warn('A param was deleted during optimization, but no args dictionary was provided.\n' +
+                              'Please ensure that your model weights match the newly optimized model.')
+
         aux_names = self.list_auxiliary_states()
         new_aux_names = new_sym.list_auxiliary_states()
         deleted_aux_names = set([item for item in aux_names
@@ -1569,8 +1570,8 @@ def optimize_for(self, backend, args=None, aux=None, ctx=None, **kwargs):
                     if a_n in aux:
                         aux.pop(a_n)
             else:
-                warnings.warn('optimize_for deleted some aux argument. \n' +
-                              'Provide a dictionary to the aux argument to optimize_for')
+                warnings.warn('A param was deleted during optimization, but no args dictionary was provided.\n' +
+                              'Please ensure that your model weights match the newly optimized model.')
 
         return new_sym