message: fix list list float check type in serialize
diff: @@ -164,12 +164,11 @@ class ParameterServer(Params):
  if isinstance(value, float) or isinstance(value, int) \
  or isinstance(value,bool):
  return True
  - elif isinstance(value, list):
  # list float
  - for el in value:
  - if not isinstance(el, float):
  - return False
  + elif all(isinstance(el, float) for el in value):
  + return True
  # list list float
  + elif isinstance(value, list):
  for el in value:
  if not isinstance(el, list):
  return False
  