fix Collective multi dataset_name

Author: vslyu

core/trainers/framework/network.py

@@ -363,6 +363,7 @@ def __init__(self, context):
     def build_network(self, context):
         context["model"] = {}
         if len(context["env"]["phase"]) > 1:
+            print("CollectiveNetwork phase:{}".format(context["env"]["phase"]))
             warnings.warn(
                 "Cluster Train Only Support One Phase.",
                 category=UserWarning,
@@ -407,16 +408,17 @@ def build_network(self, context):
                 context["model"][model_dict["name"]]["compiled_program"] = None
 
         context["dataset"] = {}
-        for dataset in context["env"]["dataset"]:
-            type = envs.get_global_env("dataset." + dataset["name"] + ".type")
+        for phase in context["env"]["phase"]:
+            type = envs.get_global_env("dataset." + phase["dataset_name"] +
+                                       ".type")
             if type == "QueueDataset":
                 raise ValueError(
                     "Collective don't support QueueDataset training, please use DataLoader."
                 )
                 dataset_class = QueueDataset(context)
-                context["dataset"][dataset[
-                    "name"]] = dataset_class.create_dataset(dataset["name"],
-                                                            context)
+                context["dataset"][phase[
+                    "dataset_name"]] = dataset_class.create_dataset(
+                        phase["dataset_name"], context)
         context["status"] = "startup_pass"
 
     def _build_strategy(self, context):