message: [Keras]: minor fix of tuple
diff: @@ -20,8 +20,7 @@ class Sequential(BaseModel):
  self._nb_layers += 1
  if (layer.layer_id == 0):
  - input_shape = list(layer.input_shape)
  - input_tensor = Input(batch_shape=input_shape, dtype="float32")
  + input_tensor = Input(batch_shape=layer.input_shape, dtype="float32")
  self._input_tensors.append(input_tensor)
  self._output_tensor = input_tensor
  