Prevent starchat from generating nonsense after ouptutting <|system|> <|end|> <|user|>

[KukumavMozolo]

When using starchat the model will likely start talking bullshit (in Spanish) after printing out the sequence:

<|system|> <|end|> <|user|>

I added a rudimentary fix to stop generating new tokens in case starchat is used after outputting <|system|> <|end|> <|user|>:

        // check if model is santacoder
        if (model.hparams.n_layer <= 30 && embd.back() == 49152) {
            break;
        }
        // check if model is starcoder
        else if (embd.back() == 0) { //TODO: this is only for starcoder
            break;
        }
        // starchat since only these 3 models are supported atm
        else{
            // break to prevent starchat from talking gibberish
            if (output.find("<|system|>\n<|end|>\n<|user|>") != std::string::npos) {
                break;
            }
        }

Would that be desirable pr? And also what is the correct way to detect if the model is indeed starcoder instead of using the default?