Updated hypothesis key generation to be the same as sherpa

[jingzhaoou]

As suggested by the subject. This makes it easier to compare results between sherpa and sherpa-onnx.

[csukuangfj]

please change it to

std::string sep;

and leave the code in the for loop unchanged.

[jingzhaoou]

@csukuangfj I changed the code as suggested, which looks like the following

  std::string Key() const {
    // TODO(fangjun): Use a hash function?
    std::ostringstream os;
    std::string sep;
    for (auto i : ys) {
      os << i << sep;
      sep = "-";
    }
    return os.str();
  }

For 0, 0, 120, the key is "00-120-". I assume 0-0-120 is the correct join result. Let me know if I miss anything. Thanks.

[csukuangfj]

Please change

os << i << sep;

to

os << sep << i;

Thanks!

[jingzhaoou]

@csukuangfj Just changed as suggested. Seem working well. Thanks a lot!

[csukuangfj]

Thanks!