Parts are missing in the encoder part

[TientJan]

Hello, in the MemoryEncoder Class, it seems that there should be added the definition of self.layers. In the if self.cfg.feat_cross_attn part of forward() function, self.layers is used without definition.

[qinliuliuqin]

Hi, this issue has been mentioned in #23.

[drinkingcoder]

Yes. This option should always be False. We will trim our code that is out of date.