code optimized

python/paddle/fluid/io.py

@@ -454,17 +454,16 @@ def get_parameter_value_by_name(name, executor, program=None):
     return get_parameter_value(var, executor)
 
 
-SUCCESS = "_SUCCESS"
-BEGIN_SECS = None
+SUCCESS_MARK_FILENAME = "_SUCCESS"
 
 
 def save_checkpoint(executor,
-                    dirname,
-                    keep_max=3,
-                    save_secs=600,
+                    dirname=None,
+                    max_num_checkpoints=3,
+                    save_interval_secs=600,
                     main_program=None):
     """
-    Save Variables to Checkpint Dir
+    Save Variables to Checkpoint Directory
 
     :param dirname
     :param keep_max
@@ -472,20 +471,19 @@ def save_checkpoint(executor,
     :param main_program
     """
     if dirname is None:
-        raise Exception("save checkpoint dir can not be none")
+        dirname = os.getcwd()
 
     if not os.path.isdir(dirname):
         os.makedirs(dirname)
 
-    global BEGIN_SECS
-    if BEGIN_SECS is not None:
-        if time.time() - BEGIN_SECS < save_secs:
+    serial = _get_lastest_checkpoint_dir(dirname)
+    if serial >= 0 and not _interval_secs_exceed(
+            os.path.join(dirname, str(serial)), save_interval_secs):
         return
-    BEGIN_SECS = time.time()
 
-    serial = _get_lastest_checkpoint_dir(dirname) + 1
+    serial = serial + 1
     cur_dir = os.path.join(dirname, str(serial))
-    # save_persistables(executor, cur_dir, main_program)
+
     save_vars(
         executor,
         dirname=cur_dir,
@@ -494,10 +492,10 @@ def save_checkpoint(executor,
         predicate=is_checkpoint_var,
         filename=None)
     _write_success(cur_dir)
-    _lru_delete(dirname, keep_max)
+    _lru_delete(dirname, max_num_checkpoints)
 
 
-def restore_checkpoint(dirname, executor, main_program=None):
+def restore_checkpoint(executor, dirname=None, main_program=None):
     """
     Load Variables from Checkpint Dir
 
@@ -505,15 +503,16 @@ def restore_checkpoint(dirname, executor, main_program=None):
     :param executor
     :param main_program
     """
-    if dirname is None and os.path.isdir(dirname):
-        raise Exception("restore checkpoint can not load variables from %s" %
-                        dirname)
+
+    if dirname is None:
+        dirname = os.getcwd()
+
     serial = _get_lastest_checkpoint_dir(dirname)
 
     if serial < 0:
         return
     cur_dir = os.path.join(dirname, str(serial))
-    # load_persistables(executor, cur_dir, main_program)
+
     load_vars(
         executor,
         dirname=cur_dir,
@@ -523,6 +522,10 @@ def restore_checkpoint(dirname, executor, main_program=None):
 
 
 def is_checkpoint_var(var):
+    """
+    VarType will fliter out FEED_MINIBATCH FETCH_LIST RAW
+    VarName will fliter out Gradient
+    """
     if var.desc.type() == core.VarDesc.VarType.FEED_MINIBATCH or \
             var.desc.type() == core.VarDesc.VarType.FETCH_LIST or \
             var.desc.type() == core.VarDesc.VarType.RAW:
@@ -534,6 +537,13 @@ def is_checkpoint_var(var):
     return var.persistable
 
 
+def _interval_secs_exceed(dirname, save_interval_secs):
+    dir_time = os.path.getmtime(dirname)
+    if save_interval_secs > (time.time() - dir_time):
+        return False
+    return True
+
+
 def _lru_delete(dirname, keep_max=3):
     """
     retain checkpoint nums with keep_max
@@ -560,7 +570,7 @@ def _write_success(dirname):
     """
     write _SUCCESS to checkpoint dir
     """
-    success_file = os.path.join(dirname, SUCCESS)
+    success_file = os.path.join(dirname, SUCCESS_MARK_FILENAME)
     with open(success_file, 'a'):
         pass
 
@@ -584,7 +594,8 @@ def _get_lastest_checkpoint_dir(checkpoint_dir):
         except ValueError:
             return -1
 
-        success_path = os.path.join(checkpoint_dir, cur_dir, SUCCESS)
+        success_path = os.path.join(checkpoint_dir, cur_dir,
+                                    SUCCESS_MARK_FILENAME)
         if os.path.isfile(success_path):
             return int(cur_dir)