Google BLEU Metric Card
A few things that aren't clear for me:
- "Because it performs better on individual sentence pairs as compared to BLEU, Google BLEU has also been used in RL experiments." -- why is this the case? why would that make it more usable for RL? (also, you should put "Reinforcement Learning" explicitly, not just the acronym)
- (Minor issue) -- I put inputs before the first example code, I think that's clearer somehow

Otherwise, it looks great, good job @emibaylor !

Add metric card for Google BLEU (GLEU) metric

One thing I noticed while writing this up is that, while this metric was made specifically to be better than BLEU at the sentence level instead of the corpus level, the current implementation only allows the calculation of the corpus-level statistic. I think changing this would be a good thing to put on the to do list for the future.