[cherry-pick] fix pickle between python 2 & 3 (#22620)

* cherry-pick #22555
test=release/1.7, test=develop

* cherry-pick #22621
test=release/1.7, test=develop

Author: songyouwei

python/paddle/fluid/dygraph/checkpoint.py

@@ -18,6 +18,7 @@
 import collections
 from ..framework import Variable, default_main_program, in_dygraph_mode, dygraph_only, Parameter, ParamBase
 import pickle
+import six
 from . import learning_rate_scheduler
 import warnings
 from .. import core
@@ -88,7 +89,7 @@ def save_dygraph(state_dict, model_path):
         os.makedirs(dir_name)
 
     with open(file_name, 'wb') as f:
-        pickle.dump(model_dict, f)
+        pickle.dump(model_dict, f, protocol=2)
 
 
 @dygraph_only
@@ -130,14 +131,16 @@ def load_dygraph(model_path, keep_name_table=False):
             params_file_path))
 
     with open(params_file_path, 'rb') as f:
-        para_dict = pickle.load(f)
+        para_dict = pickle.load(f) if six.PY2 else pickle.load(
+            f, encoding='latin1')
 
     if not keep_name_table and "StructuredToParameterName@@" in para_dict:
         del para_dict["StructuredToParameterName@@"]
     opti_dict = None
     opti_file_path = model_path + ".pdopt"
     if os.path.exists(opti_file_path):
         with open(opti_file_path, 'rb') as f:
-            opti_dict = pickle.load(f)
+            opti_dict = pickle.load(f) if six.PY2 else pickle.load(
+                f, encoding='latin1')
 
     return para_dict, opti_dict

python/paddle/fluid/io.py

@@ -800,7 +800,7 @@ def name_has_fc(var):
             var_temp = paddle.fluid.global_scope().find_var(each_var.name)
             assert var_temp != None, "can't not find var: " + each_var.name
             new_shape = (np.array(var_temp.get_tensor())).shape
-            assert each_var.name in orig_para_shape, earch_var.name + "MUST in var list"
+            assert each_var.name in orig_para_shape, each_var.name + "MUST in var list"
             orig_shape = orig_para_shape.get(each_var.name)
             if new_shape != orig_shape:
                 raise RuntimeError(
@@ -1579,14 +1579,14 @@ def get_tensor(var):
     parameter_list = list(filter(is_parameter, program.list_vars()))
     param_dict = {p.name: get_tensor(p) for p in parameter_list}
     with open(model_path + ".pdparams", 'wb') as f:
-        pickle.dump(param_dict, f)
+        pickle.dump(param_dict, f, protocol=2)
 
     optimizer_var_list = list(
         filter(is_belong_to_optimizer, program.list_vars()))
 
     opt_dict = {p.name: get_tensor(p) for p in optimizer_var_list}
     with open(model_path + ".pdopt", 'wb') as f:
-        pickle.dump(opt_dict, f)
+        pickle.dump(opt_dict, f, protocol=2)
 
     main_program = program.clone()
     program.desc.flush()
@@ -1733,7 +1733,8 @@ def set_var(var, ndarray):
                                                    global_scope(),
                                                    executor._default_executor)
     with open(parameter_file_name, 'rb') as f:
-        load_dict = pickle.load(f)
+        load_dict = pickle.load(f) if six.PY2 else pickle.load(
+            f, encoding='latin1')
     for v in parameter_list:
         assert v.name in load_dict, \
             "Can not find [{}] in model file [{}]".format(
@@ -1753,7 +1754,8 @@ def set_var(var, ndarray):
                 optimizer_var_list, global_scope(), executor._default_executor)
 
         with open(opt_file_name, 'rb') as f:
-            load_dict = pickle.load(f)
+            load_dict = pickle.load(f) if six.PY2 else pickle.load(
+                f, encoding='latin1')
         for v in optimizer_var_list:
             assert v.name in load_dict, \
                 "Can not find [{}] in model file [{}]".format(
@@ -1877,12 +1879,14 @@ def clone_var_to_block(block, var):
         "Parameter file [{}] not exits".format(parameter_file_name)
 
     with open(parameter_file_name, 'rb') as f:
-        para_dict = pickle.load(f)
+        para_dict = pickle.load(f) if six.PY2 else pickle.load(
+            f, encoding='latin1')
 
     opt_file_name = model_prefix + ".pdopt"
     if os.path.exists(opt_file_name):
         with open(opt_file_name, 'rb') as f:
-            opti_dict = pickle.load(f)
+            opti_dict = pickle.load(f) if six.PY2 else pickle.load(
+                f, encoding='latin1')
 
         para_dict.update(opti_dict)