TDA4VM: How to develop TIDL

Hi

I'dl like to know whatb kind of restriction in MMA.

1: User can create TIDL code by themselves, and some DSP user code are compiled to the code which uses MMA if the compiler recognizes that it's best?

    Or user can only create TIDL code by using the translate tool from some models (e.g. TensorFlow)?

2: Are user able to create costume MMA codes?

3: specific function only use MMA? (i.e. Access to the MMA is restricted ?)

4:  How to proceed the re-training? 

5: Please send me the slide which described about above #1~4 offline?

Thanks and Best regards,

HaTa.