* "fix decode bug"

* "follow commnet"

* "fix error"

* "fix hook bug"

* fix based comment

* fix copyright

* fix based on comment

* add copyright hook

* add copyright hook

* refine copyright hook

* "test copyright hook"

* fix check style

* fix ci

* init commit

* change some dir name

1. user can disable peephole connections.
2. not calculate some gradients.

Use fixed activation in the lstm kernel, since there is some bug in the activation function pointer. It will be fixed later.