LSTM and Attention on Stateless CartPole

@stefanbschneider
Hi, I am reproduce the program on Partial Observability in your blog, I hope to change the discrete action in the trajectory_view into continuous action, after modifying the model, but there is an error. I have provided a code that can be reproduced. If you have time, please help me to check where I made mistakes, thank you.
trajectory_view with continuous action