[wip] add load lookup table in io and trianer

python/paddle/fluid/io.py

@@ -25,7 +25,8 @@ __all__ = [
     'load_persistables', 'save_inference_model', 'load_inference_model',
     'get_inference_program', 'save_checkpoint', 'load_checkpoint',
     'clean_checkpoint', 'load_persist_vars_without_grad',
-    'save_persist_vars_without_grad', 'get_latest_checkpoint_serial'
+    'load_lookup_table_vars', 'save_persist_vars_without_grad',
+    'get_latest_checkpoint_serial'
 ]
 
 
@@ -459,7 +460,9 @@ def get_parameter_value_by_name(name, executor, program=None):
 SUCCESS_MARK_FILENAME = "_SUCCESS"
 CHECKPOINT_PREFIX = "checkpoint"
 MODEL_DIR = "__model__"
+LOOKUP_TABLE_DIR = "__lookup_table__"
 TRAINER_PREFIX = "trainer"
+PSERVER_PREFIX = "pserver"
 CHECKPOINT_SEPARATOR = "_"
 
 
@@ -567,6 +570,14 @@ def load_persist_vars_without_grad(executor,
         filename=None)
 
 
+def load_lookup_table_vars(executor, dirname, pserver_id, table_name):
+    lookup_table_dir = os.path.join(dirname, LOOKUP_TABLE_DIR)
+    table_file = table_name + CHECKPOINT_SEPARATOR + PSERVER_PREFIX + CHECKPOINT_SEPARATOR + str(
+        pserver_id)
+
+    load_vars(executor, lookup_table_dir, vars=table_name, filename=table_file)
+
+
 def save_persist_vars_without_grad(executor, dirname, program):
     """
     save_persist_vars_without_grad  will save variables to a directory by an executor,

python/paddle/fluid/trainer.py

@@ -62,27 +62,20 @@ class CheckpointConfig(object):
                  max_num_checkpoints=3,
                  epoch_interval=1,
                  step_interval=10):
-        if checkpoint_dir is None:
-            self.checkpoint_dir = os.getcwd()
-        else:
-            self.checkpoint_dir = checkpoint_dir
 
-        self.max_num_checkpoints = max_num_checkpoints
+        assert epoch_interval >= 1
+        assert step_interval >= 1
 
-        if epoch_interval < 1:
-            self.epoch_interval = 1
-        else:
+        self.checkpoint_dir = checkpoint_dir if checkpoint_dir is not None else os.getcwd(
+        )
+        self.max_num_checkpoints = max_num_checkpoints
         self.epoch_interval = epoch_interval
-
-        if step_interval < 1:
-            self.step_interval = 10
-        else:
         self.step_interval = step_interval
-
         self.epoch_id = 0
         self.step_id = 0
         self.load_serial = None
         self.is_pserver = False
+        self.has_lookup_table = False
 
 
 def check_and_get_place(place):
@@ -188,6 +181,11 @@ class Trainer(object):
                         self._get_checkpoint_load_args())
                     self.checkpoint_cfg.epoch_id = int(epoch_id)
                     self.checkpoint_cfg.step_id = int(step_id)
+                else:
+                    if self.checkpoint_cfg.has_lookup_table:
+                        io.load_lookup_table_vars(
+                            exe, self.checkpoint_cfg.checkpoint_dir, 0,
+                            "table_name")
 
         if param_path and os.path.isdir(param_path):
             # load params from param_path into scope