message: keras: add another two assertion
diff: @@ -65,6 +65,8 @@ class Sequential(BaseModel):
  assert layer.ffhandle != 0, "layer handle is wrong"
  print(layer.ffhandle)
  + assert layer.output_tensor == 0, "wrong"
  + assert len(layer.input_tensors) == 0, "wrong"
  if (verify_inout_shape == True):
  layer.verify_inout_shape(in_t, out_t)
  