add paramater validation for train job caches api

mindinsight/datavisual/processors/train_task_manager.py

@@ -14,6 +14,7 @@
 # ============================================================================
 """Train task manager."""
 
+from mindinsight.utils.exceptions import ParamTypeError
 from mindinsight.datavisual.common.log import logger
 from mindinsight.datavisual.common import exceptions
 from mindinsight.datavisual.common.enums import PluginNameEnum
@@ -141,9 +142,20 @@ class TrainTaskManager(BaseProcessor):
 
         Returns:
             dict, indicates train job ID and its current cache status.
+
+        Raises:
+            ParamTypeError, if the given train_ids parameter is not in valid type.
         """
+        if not isinstance(train_ids, list):
+            logger.error("train_ids must be list.")
+            raise ParamTypeError('train_ids', list)
+
         cache_result = []
         for train_id in train_ids:
+            if not isinstance(train_id, str):
+                logger.error("train_id must be str.")
+                raise ParamTypeError('train_id', str)
+
             try:
                 train_job = self._data_manager.get_train_job(train_id)
             except exceptions.TrainJobNotExistError: