TanhLayer.vhdl correct?

[BlazeCode2]

Is the TanhLayer.vhdl's logic correct?. it just bit slices the SUM_WIDTH long bit array to BITWIDTH wide. it won't even consider the sign bit. Just take the least significant BITWIDTH bits.

[KamelAbdelouahab]

Few commits ago I reformulated the tanh layer hdl. This new implementation TanHLayer is kind of trashy
It's supposed to implement a piece-wise approximation of the TanH described here https://hal.archives-ouvertes.fr/hal-01654697/document . If you find time to improve its behavior, please pull request :)