Dred

Results 2 issues of Dred

### Description When creating the layer with two different embeddings, the variable names of these embeddings are the same, which confuses the `load_weights` process and leads to the prediction error...

bug

## Description Fix the issus that training data missing/trade date is NaT randomly occurs when using route RollingStrategy with OnlineManager. ## Motivation and Context In RollingGen, the handler_mod is used...