Fix dygraph save load problem

test=release/1.4

Author: velconia

python/paddle/fluid/dygraph/checkpoint.py

@@ -75,7 +75,7 @@ def save_persistables(vardict, dirname, filename=None):
         _save_var_to_file(vardict, dirname, filename)
 
 
-def load_persistables(vardict, dirname, filename=None):
+def load_persistables(dirname):
     """
     This function trys to load persistable variables from the folder
     `dirname` or the file `filename`.
@@ -86,11 +86,7 @@ def load_persistables(vardict, dirname, filename=None):
     the file name.
 
     Args:
-        vardict(dict of Parameters): The parameters will be loaded.
         dirname(str): The directory path.
-        filename(str|None): The file which saved all variables, this file path should be end with '.npz'. If variables were
-                            saved in differnet files, set it to None.
-                            Default: None
 
     Returns:
         dict: The parameter-dict resumed from file
@@ -104,10 +100,7 @@ def load_persistables(vardict, dirname, filename=None):
             param_1 = param_dict['PtbModel_0.w_1']
 
         """
-    if isinstance(vardict, collections.OrderedDict):
-        return _load_var_from_file(vardict, dirname, filename)
-
-    return {}
+    return _load_var_from_file(dirname)
 
 
 def _save_var_to_file(stat_dict, file_dir, file_name):
@@ -139,41 +132,39 @@ def _save_var_to_file(stat_dict, file_dir, file_name):
             })
 
 
-def _load_var_from_file(stat_dict, file_dir, file_name):
+def _load_var_from_file(file_dir):
+    def walk_filename(file_dir):
+        base_path = os.path.join(file_dir)
+        var_name_list = []
+        if os.path.exists(base_path):
+            for dirpath, dirnames, filenames in os.walk(base_path):
+                pt = dirpath.replace(base_path, "", 1)
+                if pt.startswith("/") or pt.startswith("\\"):
+                    pt = pt[1:]
+                for fth_name in filenames:
+                    if fth_name[0] != '.':
+                        name_path = os.path.join(pt, fth_name)
+                        if "\\" in name_path:
+                            name_path = name_path.replace("\\", "/")
+                        var_name_list.append(name_path)
+
+        return var_name_list
+
     load_block = default_main_program().global_block()
     load_var_map = {}
-
-    for var_key, each_var in stat_dict.items():
-        assert isinstance(each_var, Variable)
-        if each_var.type == core.VarDesc.VarType.RAW:
-            continue
-        new_var = _clone_var_in_block_(load_block, each_var)
-        if file_name is None:
-            load_block.append_op(
-                type='load',
-                inputs={},
-                outputs={'Out': [new_var]},
-                attrs={
-                    'file_path': os.path.join(file_dir,
-                                              os.path.normpath(each_var.name))
-                })
-
-        load_var_map[new_var.name] = new_var
-
-    if file_name is not None:
-        load_var_list = []
-        for name in sorted(load_var_map.keys()):
-            load_var_list.append(load_var_map[name])
-
+    file_var_list = walk_filename(file_dir)
+    for var_name in file_var_list:
+        new_var = Variable(block=load_block, name=var_name)
         load_block.append_op(
-            type='load_combine',
+            type='load',
             inputs={},
-            outputs={"Out": load_var_list},
+            outputs={'Out': [new_var]},
             attrs={
-                'file_path': os.path.join(file_dir, os.path.normpath(file_name))
+                'file_path': os.path.join(file_dir,
+                                          os.path.normpath(new_var.name))
             })
-        for res_var in load_var_list:
-            load_var_map[res_var.name] = res_var
+
+        load_var_map[new_var.name] = new_var
 
     return load_var_map
 

python/paddle/fluid/dygraph/layers.py

@@ -45,6 +45,7 @@ def __init__(self, name_scope, dtype=core.VarDesc.VarType.FP32):
         self._dtype = dtype
         self._parameters = collections.OrderedDict()
         self._sub_layers = collections.OrderedDict()
+        self._loaddict_holder = collections.OrderedDict()
 
         self._helper = LayerObjectHelper(self._full_name)
 
@@ -193,6 +194,9 @@ def add_parameter(self, name, parameter):
         """
         assert isinstance(parameter, framework.Parameter)
         self._parameters[name] = parameter
+        if parameter.name in self._loaddict_holder:
+            self._parameters[name] = self._loaddict_holder[parameter.name]
+            parameter = self._loaddict_holder[parameter.name]
         return parameter
 
     def __getattr__(self, name):
@@ -207,7 +211,10 @@ def __setattr__(self, name, value):
             if params is None:
                 raise ValueError(
                     "super(YourLayer, self).__init__() should be called first")
-            params[name] = value
+            if value.name in self._loaddict_holder:
+                params[name] = self._loaddict_holder[value.name]
+            else:
+                params[name] = value
         elif isinstance(value, core.Layer):
             layers = self.__dict__.get('_sub_layers', None)
             if layers is None:
@@ -244,6 +251,7 @@ def state_dict(self, destination=None, prefix='', include_sublayers=True):
         return destination
 
     def load_dict(self, stat_dict, include_sublayers=True):
+        self._loaddict_holder = stat_dict
         for name, item in self.__dict__.get('_parameters', None).items():
             if item.name in stat_dict:
                 var = item._ivar.value()

python/paddle/fluid/tests/unittests/test_imperative_checkpoint.py

@@ -142,14 +142,11 @@ def test_save_load_persistables(self):
                     for param in mnist.parameters():
                         dy_param_init_value[param.name] = param.numpy()
 
-                    mnist.load_dict(
-                        fluid.dygraph.load_persistables(mnist.state_dict(),
-                                                        "save_dir"))
-
-                    restore = mnist.parameters()
+                    restore = fluid.dygraph.load_persistables("save_dir")
+                    mnist.load_dict(restore)
 
                     self.assertEqual(len(dy_param_init_value), len(restore))
-                    for value in restore:
+                    for ky, value in restore.items():
                         self.assertTrue(
                             np.allclose(value.numpy(), dy_param_init_value[
                                 value.name]))
@@ -158,7 +155,7 @@ def test_save_load_persistables(self):
 
                     step += 1
 
-                    if step > 20:
+                    if step > 10:
                         break